{"id":344,"date":"2014-12-22T02:36:54","date_gmt":"2014-12-21T18:36:54","guid":{"rendered":"http:\/\/www.hightopo.com\/blog\/?p=344"},"modified":"2014-12-22T02:38:49","modified_gmt":"2014-12-21T18:38:49","slug":"html5-web-%e5%ae%a2%e6%88%b7%e7%ab%af%e4%ba%94%e7%a7%8d%e7%a6%bb%e7%ba%bf%e5%ad%98%e5%82%a8%e6%96%b9%e5%bc%8f%e6%b1%87%e6%80%bb","status":"publish","type":"post","link":"https:\/\/www.hightopo.com\/blog\/344.html","title":{"rendered":"HTML5 Web \u5ba2\u6237\u7aef\u4e94\u79cd\u79bb\u7ebf\u5b58\u50a8\u65b9\u5f0f\u6c47\u603b"},"content":{"rendered":"<p>\u6700\u8fd1\u6298\u817eHTML5\u6e38\u620f\u9700\u8981\u79bb\u7ebf\u5b58\u50a8\u529f\u80fd\uff0c\u4fbf\u628a\u76ee\u524d\u53ef\u7528\u7684\u51e0\u79cdHTML5\u5b58\u50a8\u65b9\u5f0f\u7814\u7a76\u4e86\u4e0b\uff0c\u57fa\u4e8e<a href=\"http:\/\/www.hightopo.com\/\">HT for Web<\/a>\u5199\u4e86\u4e2a\u7efc\u5408\u7684\u5b9e\u4f8b\uff0c\u5206\u522b\u5229\u7528\u4e86Cookie\u3001WebStorage\u3001IndexedDB\u4ee5\u53caFileSystem\u56db\u79cd\u672c\u5730\u79bb\u7ebf\u5b58\u50a8\u65b9\u5f0f\uff0c\u5bf9\u71c3\u6c14\u76d1\u63a7\u7cfb\u7edf\u7684\u8868\u8ba1\u4f4d\u7f6e\u3001\u671d\u5411\u3001\u5f00\u5173\u4ee5\u53ca\u8868\u503c\u7b49\u4fe1\u606f\u505a\u4e86CURD\u7684\u5b58\u53d6\u64cd\u4f5c\u3002<\/p>\n<p>HTML5\u7684\u5b58\u50a8\u8fd8\u6709\u4e00\u79cd<a href=\"http:\/\/www.w3.org\/TR\/webdatabase\">Web SQL Database<\/a>\u65b9\u5f0f\uff0c\u867d\u7136\u8fd8\u6709\u6d4f\u89c8\u5668\u652f\u6301\uff0c\u662f\u552f\u4e00\u7684\u5173\u7cfb\u6570\u636e\u5e93\u7ed3\u6784\u7684\u5b58\u50a8\uff0c\u4f46W3C\u4ee5\u53ca\u505c\u6b62\u5bf9\u5176\u7684\u7ef4\u62a4\u548c\u53d1\u5c55\uff0c\u6240\u4ee5\u8fd9\u91cc\u6211\u4eec\u4e5f\u4e0d\u518d\u5bf9\u5176\u8fdb\u884c\u4ecb\u7ecd\uff1a<a href=\"http:\/\/www.w3.org\/TR\/webdatabase\">Beware. This specification is no longer in active maintenance and the Web Applications Working Group does not intend to maintain it further.<\/a><\/p>\n<p><a href=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-1.39.12-AM.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-345\" alt=\"Screen Shot 2014-12-22 at 1.39.12 AM\" src=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-1.39.12-AM.png\" width=\"913\" height=\"737\" srcset=\"https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-1.39.12-AM.png 913w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-1.39.12-AM-300x242.png 300w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-1.39.12-AM-200x161.png 200w\" sizes=\"(max-width: 913px) 100vw, 913px\" \/><\/a><\/p>\n<p>\u6574\u4e2a\u793a\u4f8b\u4e3b\u8981\u5c31\u662f\u5c06<a href=\"http:\/\/www.hightopo.com\/\">HT for Web<\/a>\u7684<a href=\"http:\/\/www.hightopo.com\/\">DataModel<\/a>\u6570\u636e\u6a21\u578b\u4fe1\u606f\u8fdb\u884c\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u5f88\u7b80\u5355\u901a\u8fc7dataModel.serialize()\u5c06\u6a21\u578b\u5e8f\u5217\u5316\u6210JSON\u5b57\u7b26\u4e32\uff0c\u901a\u8fc7dataModel.deserialize(jsonString)\u5c06JSON\u5b57\u7b26\u4e32\u5185\u5b58\u53cd\u5e8f\u5217\u5316\u51fa\u6a21\u578b\u4fe1\u606f\uff0c\u800c\u5b58\u50a8\u4e3b\u8981\u5c31\u662f\u4e3b\u8981\u5c31\u662f\u9488\u5bf9JSON\u5b57\u7b26\u4e32\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<p>\u5148\u4ecb\u7ecd\u6700\u7b80\u5355\u7684\u5b58\u50a8\u65b9\u5f0f<a href=\"http:\/\/www.w3.org\/TR\/webstorage\/\">LocalStorage<\/a>\uff0c\u4ee3\u7801\u5982\u4e0b\uff0c\u51e0\u4e4e\u4e0d\u7528\u4ecb\u7ecd\u5c31\u662fKey-Value\u7684\u7b80\u5355\u952e\u503c\u5bf9\u5b58\u50a8\u7ed3\u6784\uff0cWeb Storage\u9664\u4e86localStorage\u7684\u6301\u4e45\u6027\u5b58\u50a8\u5916\uff0c\u8fd8\u6709\u9488\u5bf9\u672c\u6b21\u56de\u8bdd\u7684sessionStorage\u65b9\u5f0f\uff0c\u4e00\u822c\u60c5\u51b5\u4e0blocalStorage\u8f83\u4e3a\u5e38\u7528\uff0c\u66f4\u591a\u53ef\u53c2\u8003\u00a0<a href=\"http:\/\/www.w3.org\/TR\/webstorage\/\">http:\/\/www.w3.org\/TR\/webstorage\/<\/a><\/p>\n<pre class=\"&quot;brush:javascript\u201d\">function save(dataModel){\r\n    var value = dataModel.serialize();\r\n    window.localStorage['DataModel'] = value;\r\n    window.localStorage['DataCount'] = dataModel.size();\r\n    console.log(dataModel.size() + ' datas are saved');\r\n    return value;\r\n}\r\nfunction restore(dataModel){  \r\n    var value = window.localStorage['DataModel'];\r\n    if(value){\r\n        dataModel.deserialize(value);\r\n        console.log(window.localStorage['DataCount'] + ' datas are restored');\r\n        return value;\r\n    }    \r\n    return '';\r\n}\r\nfunction clear(){\r\n    if(window.localStorage['DataModel']){\r\n        console.log(window.localStorage['DataCount'] + ' datas are cleared');\r\n        delete window.localStorage['DataModel'];\r\n        delete window.localStorage['DataCount'];         \r\n    }   \r\n}<\/pre>\n<p>\u6700\u53e4\u8001\u7684\u5b58\u50a8\u65b9\u5f0f\u4e3aCookie\uff0c\u672c\u4f8b\u4e2d\u6211\u53ea\u80fd\u4fdd\u5b58\u4e00\u4e2a\u56fe\u5143\u7684\u4fe1\u606f\uff0c\u8fd9\u79cd\u5b58\u50a8\u65b9\u5f0f\u5b58\u50a8\u5185\u5bb9\u5f88\u6709\u9650\uff0c\u53ea\u9002\u5408\u505a\u7b80\u5355\u4fe1\u606f\u5b58\u50a8\uff0c\u5b58\u53d6\u63a5\u53e3\u8bbe\u8ba1\u5f97\u6781\u5176\u53cd\u4eba\u7c7b\uff0c\u4e3a\u4e86\u4ecb\u7ecdHTML5\u5b58\u50a8\u65b9\u6848\u7684\u5b8c\u6574\u6027\u6211\u987a\u4fbf\u628a\u4ed6\u7ed9\u5217\u4e0a\uff1a<\/p>\n<pre class=\"&quot;brush:javascript\u201d\">function getCookieValue(name) {\r\n    if (document.cookie.length &gt; 0) {\r\n        var start = document.cookie.indexOf(name + \"=\");\r\n        if (start !== -1) {\r\n            start = start + name.length + 1;\r\n            var end = document.cookie.indexOf(\";\", start);\r\n            if (end === -1){\r\n                end = document.cookie.length;\r\n            }\r\n            return unescape(document.cookie.substring(start, end));\r\n        }\r\n    }\r\n    return '';\r\n}\r\nfunction save(dataModel) {\r\n    var value = dataModel.serialize();\r\n    document.cookie = 'DataModel=' + escape(value);\r\n    document.cookie = 'DataCount=' + dataModel.size();    \r\n    console.log(dataModel.size() + ' datas are saved');\r\n    return value;\r\n}\r\nfunction restore(dataModel){  \r\n    var value = getCookieValue('DataModel');\r\n    if(value){\r\n        dataModel.deserialize(value);\r\n        console.log(getCookieValue('DataCount') + ' datas are restored');\r\n        return value;\r\n    }    \r\n    return '';\r\n}\r\nfunction clear() {\r\n    if(getCookieValue('DataModel')){\r\n        console.log(getCookieValue('DataCount') + ' datas are cleared');\r\n        document.cookie = \"DataModel=; expires=Thu, 01 Jan 1970 00:00:00 UTC\";\r\n        document.cookie = \"DataCount=; expires=Thu, 01 Jan 1970 00:00:00 UTC\";   \r\n    }\r\n}<\/pre>\n<p>\u5982\u4eca\u6bd4\u8f83\u5b9e\u7528\u5f3a\u5927\u7684\u5b58\u50a8\u65b9\u5f0f\u4e3a<a href=\"http:\/\/www.w3.org\/TR\/IndexedDB\/\">Indexed Database API<\/a>\uff0cIndexedDB\u53ef\u4ee5\u5b58\u50a8\u7ed3\u6784\u5bf9\u8c61\uff0c\u53ef\u6784\u5efakey\u548cindex\u7684\u7d22\u5f15\u65b9\u5f0f\u67e5\u627e\uff0c\u76ee\u524d\u5404\u6d4f\u89c8\u5668\u7684\u5df2\u7ecf\u9010\u6e10\u652f\u6301IndexedDB\u7684\u5b58\u50a8\u65b9\u5f0f\uff0c\u5176\u4f7f\u7528\u4ee3\u7801\u5982\u4e0b\uff0c\u9700\u6ce8\u610fIndexedDB\u7684\u5f88\u591a\u64cd\u4f5c\u63a5\u53e3\u7c7b\u4f3cNodeJS\u7684\u5f02\u6b65\u56de\u8c03\u65b9\u5f0f\uff0c\u7279\u522b\u662f\u67e5\u8be2\u65f6\u8fdecursor\u7684continue\u90fd\u662f\u5f02\u6b65\u518d\u6b21\u56de\u8c03onsuccess\u51fd\u6570\u7684\u64cd\u4f5c\u65b9\u5f0f\uff0c\u56e0\u6b64\u548cNodeJS\u4e00\u6837\u4f7f\u7528\u4e0a\u4e0d\u5982\u540c\u6b65\u7684\u4ee3\u7801\u5bb9\u6613\u3002<\/p>\n<pre class=\"&quot;brush:javascript\u201d\">request = indexedDB.open(\"DataModel\");\r\nrequest.onupgradeneeded = function() {  \r\n    db = request.result;\r\n    var store = db.createObjectStore(\"meters\", {keyPath: \"id\"});\r\n    store.createIndex(\"by_tag\", \"tag\", {unique: true});\r\n    store.createIndex(\"by_name\", \"name\");  \r\n};\r\nrequest.onsuccess = function() {\r\n    db = request.result;\r\n};\r\n\r\nfunction save(dataModel){\r\n    var tx = db.transaction(\"meters\", \"readwrite\");\r\n    var store = tx.objectStore(\"meters\");\r\n    dataModel.each(function(data){\r\n        store.put({\r\n            id: data.getId(),\r\n            tag: data.getTag(),\r\n            name: data.getName(),\r\n            meterValue: data.a('meter.value'),\r\n            meterAngle: data.a('meter.angle'),\r\n            p3: data.p3(),\r\n            r3: data.r3(),\r\n            s3: data.s3()\r\n        });    \r\n    });   \r\n    tx.oncomplete = function() {\r\n        console.log(dataModel.size() + ' datas are saved');\r\n    };    \r\n    return dataModel.serialize();\r\n}\r\nfunction restore(dataModel){     \r\n    var tx = db.transaction(\"meters\", \"readonly\");\r\n    var store = tx.objectStore(\"meters\");\r\n    var req = store.openCursor();  \r\n    var nodes = [];\r\n    req.onsuccess = function() {        \r\n        var res = req.result;\r\n        if(res){\r\n            var value = res.value;\r\n            var node = createNode();\r\n            node.setId(value.id);\r\n            node.setTag(value.tag);\r\n            node.setName(value.name);                        \r\n            node.a({\r\n                'meter.value': value.meterValue,\r\n                'meter.angle': value.meterAngle\r\n            });\r\n            node.p3(value.p3);                    \r\n            node.r3(value.r3);\r\n            node.s3(value.s3);\r\n            nodes.push(node);             \r\n            res.continue();\r\n        }else{\r\n            if(nodes.length){\r\n                dataModel.clear();\r\n                nodes.forEach(function(node){\r\n                    dataModel.add(node);                         \r\n                });\r\n                console.log(dataModel.size() + ' datas are restored');\r\n            }             \r\n        }       \r\n    };    \r\n    return '';\r\n}\r\nfunction clear(){\r\n    var tx = db.transaction(\"meters\", \"readwrite\");\r\n    var store = tx.objectStore(\"meters\");\r\n    var req = store.openCursor();\r\n    var count = 0;\r\n    req.onsuccess = function(event) {        \r\n        var res = event.target.result;\r\n        if(res){\r\n            store.delete(res.value.id);\r\n            res.continue();\r\n            count++;\r\n        }else{\r\n            console.log(count + ' datas are cleared');\r\n        }         \r\n    };\r\n\r\n}<\/pre>\n<p>\u6700\u540e\u662f<a href=\"http:\/\/www.w3.org\/TR\/FileAPI\/\">FileSystem API<\/a>\u76f8\u5f53\u4e8e\u64cd\u4f5c\u672c\u5730\u6587\u4ef6\u7684\u5b58\u50a8\u65b9\u5f0f\uff0c\u76ee\u524d\u652f\u6301\u6d4f\u89c8\u5668\u4e0d\u591a\uff0c\u5176\u63a5\u53e3\u6807\u51c6\u4e5f\u5728\u53d1\u5c55\u5236\u5b9a\u53d8\u5316\u4e2d\uff0c\u4f8b\u5982\u5728\u6211\u5199\u8fd9\u4e2a\u4ee3\u7801\u65f6\u5927\u90e8\u5206\u6587\u732e\u4f7f\u7528\u7684webkitStorageInfo\u5df2\u88abnavigator.webkitPersistentStorage\u548cnavigator.webkitTemporaryStorage\u66ff\u4ee3\uff0c\u5b58\u50a8\u7684\u6587\u4ef6\u53ef\u901a\u8fc7filesystem:http:\/\/www.hightopo.com\/persistent\/meters.txt&#8217;\u7684URL\u65b9\u5f0f\u5728chrome\u6d4f\u89c8\u5668\u4e2d\u67e5\u627e\u5230\uff0c\u751a\u81f3\u53ef\u901a\u8fc7filesystem:http:\/\/www.hightopo.com\/persistent\/\u7c7b\u4f3c\u76ee\u5f55\u7684\u8bbf\u95ee\uff0c\u56e0\u6b64\u4e5f\u53ef\u4ee5\u52a8\u6001\u751f\u6210\u56fe\u7247\u5230\u672c\u5730\u6587\u4ef6\uff0c\u7136\u540e\u901a\u8fc7filesystem:http:***\u7684URL\u65b9\u5f0f\u76f4\u63a5\u8d4b\u503c\u7ed9img\u7684html\u5143\u7d20\u7684src\u8bbf\u95ee\uff0c\u56e0\u6b64\u672c\u5730\u5b58\u50a8\u6253\u5f00\u4e86\u4e00\u6247\u65b0\u7684\u95e8\uff0c\u76f8\u4fe1\u4ee5\u540e\u4f1a\u5192\u51fa\u66f4\u591a\u7a00\u5947\u53e4\u602a\u7684\u5947\u8469\u5e94\u7528\u3002<\/p>\n<pre class=\"&quot;brush:javascript\u201d\">navigator.webkitPersistentStorage.queryUsageAndQuota(function (usage, quota) {\r\n        console.log('PERSISTENT: ' + usage + '\/' + quota + ' - ' + usage \/ quota + '%');\r\n    }\r\n);\r\nnavigator.webkitPersistentStorage.requestQuota(2 * 1024 * 1024,\r\n    function (grantedBytes) {\r\n        window.webkitRequestFileSystem(window.PERSISTENT, grantedBytes,\r\n            function (fs) {\r\n                window.fs = fs;\r\n            });\r\n    }\r\n);\r\nfunction save(dataModel) {\r\n    var value = dataModel.serialize();\r\n    fs.root.getFile('meters.txt', {create: true}, function (fileEntry) {\r\n        console.log(fileEntry.toURL());\r\n        fileEntry.createWriter(function (fileWriter) {\r\n            fileWriter.onwriteend = function () {\r\n                console.log(dataModel.size() + ' datas are saved');\r\n            };\r\n            var blob = new Blob([value], {type: 'text\/plain'});\r\n            fileWriter.write(blob);\r\n        });\r\n    });\r\n    return value;\r\n}\r\nfunction restore(dataModel) {\r\n    fs.root.getFile('meters.txt', {}, function (fileEntry) {\r\n        fileEntry.file(function (file) {\r\n            var reader = new FileReader();\r\n            reader.onloadend = function (e) {\r\n                dataModel.clear();\r\n                dataModel.deserialize(reader.result);\r\n                console.log(dataModel.size() + ' datas are restored');\r\n            };\r\n            reader.readAsText(file);\r\n        });\r\n    });\r\n    return '';\r\n}\r\nfunction clear() {\r\n    fs.root.getFile('meters.txt', {create: false}, function(fileEntry) {\r\n        fileEntry.remove(function() {\r\n            console.log(fileEntry.toURL() + ' is removed');\r\n        });\r\n    });    \r\n}<\/pre>\n<p><a href=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-12.53.48-AM.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-346\" alt=\"Screen Shot 2014-12-22 at 12.53.48 AM\" src=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-12.53.48-AM.png\" width=\"977\" height=\"827\" srcset=\"https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-12.53.48-AM.png 977w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-12.53.48-AM-300x253.png 300w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-12.53.48-AM-200x169.png 200w\" sizes=\"(max-width: 977px) 100vw, 977px\" \/><\/a><\/p>\n<p>Browser-Side\u7684\u5b58\u50a8\u65b9\u5f0f\u8fd8\u5728\u5feb\u901f\u7684\u53d1\u5c55\u4e2d\uff0c\u5176\u5b9e\u9664\u4e86\u4ee5\u4e0a\u51e0\u79cd\u5916\u8fd8\u6709Application Cache\uff0c\u76f8\u4fe1\u5c06\u6765\u8fd8\u4f1a\u6709\u65b0\u79c0\u51fa\u73b0\uff0c\u867d\u7136\u201c\u4e91\u201d\u662f\u5927\u8d8b\u52bf\uff0c\u4f46\u5ba2\u6237\u7aef\u5e76\u975e\u8981\u8d70\u6781\u7aef\u7684\u201c\u7626\u201d\u65b9\u6848\uff0c\u8fd9\u4e48\u591a\u5e74\u5192\u51fa\u4e86\u8fd9\u4e48\u591a\u5ba2\u6237\u7aef\u5b58\u50a8\u65b9\u5f0f\uff0c\u8bf4\u660e\u8ba9\u5ba2\u6237\u7aef\u66f4\u5f3a\u5927\u7684\u5e02\u573a\u9700\u6c42\u662f\u5f3a\u70c8\u7684\uff0c\u5f53\u7136\u76ee\u524d\u52a8\u8361\u9636\u6bb5\u82e6\u903c\u7684\u662f\u5ba2\u6237\u7aef\u7a0b\u5e8f\u5458\uff0c\u9664\u4e86\u8981\u9002\u914dMouse\u548cTouch\uff0c\u8fd8\u8981\u9002\u914d\u5404\u79cd\u5c4f\uff0c\u5982\u4eca\u8fd8\u5f97\u8003\u8651\u9002\u914d\u5404\u79cd\u5b58\u50a8\uff0c\u5e0c\u671b\u672c\u6587\u80fd\u5728\u5927\u5bb6\u9009\u578b\u5ba2\u6237\u7aef\u5b58\u50a8\u65b9\u6848\u65f6\u6709\u70b9\u5e2e\u52a9\uff0c\u6700\u540e\u4e0a\u6bb5\u57fa\u4e8e<a href=\"http:\/\/www.hightopo.com\/\">HT for Web<\/a>\u64cd\u4f5cHTML5\u5b58\u50a8\u793a\u4f8b\u7684\u89c6\u9891\u6548\u679c\uff1a<a href=\"http:\/\/v.youku.com\/v_show\/id_XODUzODU2MTY0.html\">http:\/\/v.youku.com\/v_show\/id_XODUzODU2MTY0.html<\/a><br \/>\n<iframe loading=\"lazy\" src=\"http:\/\/player.youku.com\/embed\/XODUzODU2MTY0\" height=\"498\" width=\"510\" allowfullscreen=\"\" frameborder=\"0\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6700\u8fd1\u6298\u817eHTML5\u6e38\u620f\u9700\u8981\u79bb\u7ebf\u5b58\u50a8\u529f\u80fd\uff0c\u4fbf\u628a\u76ee\u524d\u53ef\u7528\u7684\u51e0\u79cdHTML5\u5b58\u50a8\u65b9\u5f0f\u7814\u7a76\u4e86\u4e0b\uff0c\u57fa\u4e8e<a href=\"http:\/\/www.hightopo.com\/\">HT for Web<\/a>\u5199\u4e86\u4e2a\u7efc\u5408\u7684\u5b9e\u4f8b\uff0c\u5206\u522b\u5229\u7528\u4e86Cookie\u3001WebStorage\u3001IndexedDB\u4ee5\u53caFileSystem\u56db\u79cd\u672c\u5730\u79bb\u7ebf\u5b58\u50a8\u65b9\u5f0f\uff0c\u5bf9\u71c3\u6c14\u76d1\u63a7\u7cfb\u7edf\u7684\u8868\u8ba1\u4f4d\u7f6e\u3001\u671d\u5411\u3001\u5f00\u5173\u4ee5\u53ca\u8868\u503c\u7b49\u4fe1\u606f\u505a\u4e86CURD\u7684\u5b58\u53d6\u64cd\u4f5c\u3002<\/p>\n<p>HTML5\u7684\u5b58\u50a8\u8fd8\u6709\u4e00\u79cd<a href=\"http:\/\/www.w3.org\/TR\/webdatabase\">Web SQL Database<\/a>\u65b9\u5f0f\uff0c\u867d\u7136\u8fd8\u6709\u6d4f\u89c8\u5668\u652f\u6301\uff0c\u662f\u552f\u4e00\u7684\u5173\u7cfb\u6570\u636e\u5e93\u7ed3\u6784\u7684\u5b58\u50a8\uff0c\u4f46W3C\u4ee5\u53ca\u505c\u6b62\u5bf9\u5176\u7684\u7ef4\u62a4\u548c\u53d1\u5c55\uff0c\u6240\u4ee5\u8fd9\u91cc\u6211\u4eec\u4e5f\u4e0d\u518d\u5bf9\u5176\u8fdb\u884c\u4ecb\u7ecd\uff1a<a href=\"http:\/\/www.w3.org\/TR\/webdatabase\">Beware. This specification is no longer in active maintenance and the Web Applications Working Group does not intend to maintain it further.<\/a><\/p>\n<p><a href=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-1.39.12-AM.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-345\" alt=\"Screen Shot 2014-12-22 at 1.39.12 AM\" src=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-1.39.12-AM.png\" width=\"913\" height=\"737\" srcset=\"https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-1.39.12-AM.png 913w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-1.39.12-AM-300x242.png 300w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-1.39.12-AM-200x161.png 200w\" sizes=\"(max-width: 913px) 100vw, 913px\" \/><\/a><\/p>\n<p>\u6574\u4e2a\u793a\u4f8b\u4e3b\u8981\u5c31\u662f\u5c06<a href=\"http:\/\/www.hightopo.com\/\">HT for Web<\/a>\u7684<a href=\"http:\/\/www.hightopo.com\/\">DataModel<\/a>\u6570\u636e\u6a21\u578b\u4fe1\u606f\u8fdb\u884c\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u5f88\u7b80\u5355\u901a\u8fc7dataModel.serialize()\u5c06\u6a21\u578b\u5e8f\u5217\u5316\u6210JSON\u5b57\u7b26\u4e32\uff0c\u901a\u8fc7dataModel.deserialize(jsonString)\u5c06JSON\u5b57\u7b26\u4e32\u5185\u5b58\u53cd\u5e8f\u5217\u5316\u51fa\u6a21\u578b\u4fe1\u606f\uff0c\u800c\u5b58\u50a8\u4e3b\u8981\u5c31\u662f\u4e3b\u8981\u5c31\u662f\u9488\u5bf9JSON\u5b57\u7b26\u4e32\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<p>\u5148\u4ecb\u7ecd\u6700\u7b80\u5355\u7684\u5b58\u50a8\u65b9\u5f0f<a href=\"http:\/\/www.w3.org\/TR\/webstorage\/\">LocalStorage<\/a>\uff0c\u4ee3\u7801\u5982\u4e0b\uff0c\u51e0\u4e4e\u4e0d\u7528\u4ecb\u7ecd\u5c31\u662fKey-Value\u7684\u7b80\u5355\u952e\u503c\u5bf9\u5b58\u50a8\u7ed3\u6784\uff0cWeb Storage\u9664\u4e86localStorage\u7684\u6301\u4e45\u6027\u5b58\u50a8\u5916\uff0c\u8fd8\u6709\u9488\u5bf9\u672c\u6b21\u56de\u8bdd\u7684sessionStorage\u65b9\u5f0f\uff0c\u4e00\u822c\u60c5\u51b5\u4e0blocalStorage\u8f83\u4e3a\u5e38\u7528\uff0c\u66f4\u591a\u53ef\u53c2\u8003\u00a0<a href=\"http:\/\/www.w3.org\/TR\/webstorage\/\">http:\/\/www.w3.org\/TR\/webstorage\/<\/a><\/p>\n<pre class=\"&quot;brush:javascript\u201d\">function save(dataModel){\r\n    var value = dataModel.serialize();\r\n    window.localStorage['DataModel'] = value;\r\n    window.localStorage['DataCount'] = dataModel.size();\r\n    console.log(dataModel.size() + ' datas are saved');\r\n    return value;\r\n}\r\nfunction restore(dataModel){  \r\n    var value = window.localStorage['DataModel'];\r\n    if(value){\r\n        dataModel.deserialize(value);\r\n        console.log(window.localStorage['DataCount'] + ' datas are restored');\r\n        return value;\r\n    }    \r\n    return '';\r\n}\r\nfunction clear(){\r\n    if(window.localStorage['DataModel']){\r\n        console.log(window.localStorage['DataCount'] + ' datas are cleared');\r\n        delete window.localStorage['DataModel'];\r\n        delete window.localStorage['DataCount'];         \r\n    }   \r\n}<\/pre>\n<p>\u6700\u53e4\u8001\u7684\u5b58\u50a8\u65b9\u5f0f\u4e3aCookie\uff0c\u672c\u4f8b\u4e2d\u6211\u53ea\u80fd\u4fdd\u5b58\u4e00\u4e2a\u56fe\u5143\u7684\u4fe1\u606f\uff0c\u8fd9\u79cd\u5b58\u50a8\u65b9\u5f0f\u5b58\u50a8\u5185\u5bb9\u5f88\u6709\u9650\uff0c\u53ea\u9002\u5408\u505a\u7b80\u5355\u4fe1\u606f\u5b58\u50a8\uff0c\u5b58\u53d6\u63a5\u53e3\u8bbe\u8ba1\u5f97\u6781\u5176\u53cd\u4eba\u7c7b\uff0c\u4e3a\u4e86\u4ecb\u7ecdHTML5\u5b58\u50a8\u65b9\u6848\u7684\u5b8c\u6574\u6027\u6211\u987a\u4fbf\u628a\u4ed6\u7ed9\u5217\u4e0a\uff1a<\/p>\n<pre class=\"&quot;brush:javascript\u201d\">function getCookieValue(name) {\r\n    if (document.cookie.length &gt; 0) {\r\n        var start = document.cookie.indexOf(name + \"=\");\r\n        if (start !== -1) {\r\n            start = start + name.length + 1;\r\n            var end = document.cookie.indexOf(\";\", start);\r\n            if (end === -1){\r\n                end = document.cookie.length;\r\n            }\r\n            return unescape(document.cookie.substring(start, end));\r\n        }\r\n    }\r\n    return '';\r\n}\r\nfunction save(dataModel) {\r\n    var value = dataModel.serialize();\r\n    document.cookie = 'DataModel=' + escape(value);\r\n    document.cookie = 'DataCount=' + dataModel.size();    \r\n    console.log(dataModel.size() + ' datas are saved');\r\n    return value;\r\n}\r\nfunction restore(dataModel){  \r\n    var value = getCookieValue('DataModel');\r\n    if(value){\r\n        dataModel.deserialize(value);\r\n        console.log(getCookieValue('DataCount') + ' datas are restored');\r\n        return value;\r\n    }    \r\n    return '';\r\n}\r\nfunction clear() {\r\n    if(getCookieValue('DataModel')){\r\n        console.log(getCookieValue('DataCount') + ' datas are cleared');\r\n        document.cookie = \"DataModel=; expires=Thu, 01 Jan 1970 00:00:00 UTC\";\r\n        document.cookie = \"DataCount=; expires=Thu, 01 Jan 1970 00:00:00 UTC\";   \r\n    }\r\n}<\/pre>\n<p>\u5982\u4eca\u6bd4\u8f83\u5b9e\u7528\u5f3a\u5927\u7684\u5b58\u50a8\u65b9\u5f0f\u4e3a<a href=\"http:\/\/www.w3.org\/TR\/IndexedDB\/\">Indexed Database API<\/a>\uff0cIndexedDB\u53ef\u4ee5\u5b58\u50a8\u7ed3\u6784\u5bf9\u8c61\uff0c\u53ef\u6784\u5efakey\u548cindex\u7684\u7d22\u5f15\u65b9\u5f0f\u67e5\u627e\uff0c\u76ee\u524d\u5404\u6d4f\u89c8\u5668\u7684\u5df2\u7ecf\u9010\u6e10\u652f\u6301IndexedDB\u7684\u5b58\u50a8\u65b9\u5f0f\uff0c\u5176\u4f7f\u7528\u4ee3\u7801\u5982\u4e0b\uff0c\u9700\u6ce8\u610fIndexedDB\u7684\u5f88\u591a\u64cd\u4f5c\u63a5\u53e3\u7c7b\u4f3cNodeJS\u7684\u5f02\u6b65\u56de\u8c03\u65b9\u5f0f\uff0c\u7279\u522b\u662f\u67e5\u8be2\u65f6\u8fdecursor\u7684continue\u90fd\u662f\u5f02\u6b65\u518d\u6b21\u56de\u8c03onsuccess\u51fd\u6570\u7684\u64cd\u4f5c\u65b9\u5f0f\uff0c\u56e0\u6b64\u548cNodeJS\u4e00\u6837\u4f7f\u7528\u4e0a\u4e0d\u5982\u540c\u6b65\u7684\u4ee3\u7801\u5bb9\u6613\u3002<\/p>\n<pre class=\"&quot;brush:javascript\u201d\">request = indexedDB.open(\"DataModel\");\r\nrequest.onupgradeneeded = function() {  \r\n    db = request.result;\r\n    var store = db.createObjectStore(\"meters\", {keyPath: \"id\"});\r\n    store.createIndex(\"by_tag\", \"tag\", {unique: true});\r\n    store.createIndex(\"by_name\", \"name\");  \r\n};\r\nrequest.onsuccess = function() {\r\n    db = request.result;\r\n};\r\n\r\nfunction save(dataModel){\r\n    var tx = db.transaction(\"meters\", \"readwrite\");\r\n    var store = tx.objectStore(\"meters\");\r\n    dataModel.each(function(data){\r\n        store.put({\r\n            id: data.getId(),\r\n            tag: data.getTag(),\r\n            name: data.getName(),\r\n            meterValue: data.a('meter.value'),\r\n            meterAngle: data.a('meter.angle'),\r\n            p3: data.p3(),\r\n            r3: data.r3(),\r\n            s3: data.s3()\r\n        });    \r\n    });   \r\n    tx.oncomplete = function() {\r\n        console.log(dataModel.size() + ' datas are saved');\r\n    };    \r\n    return dataModel.serialize();\r\n}\r\nfunction restore(dataModel){     \r\n    var tx = db.transaction(\"meters\", \"readonly\");\r\n    var store = tx.objectStore(\"meters\");\r\n    var req = store.openCursor();  \r\n    var nodes = [];\r\n    req.onsuccess = function() {        \r\n        var res = req.result;\r\n        if(res){\r\n            var value = res.value;\r\n            var node = createNode();\r\n            node.setId(value.id);\r\n            node.setTag(value.tag);\r\n            node.setName(value.name);                        \r\n            node.a({\r\n                'meter.value': value.meterValue,\r\n                'meter.angle': value.meterAngle\r\n            });\r\n            node.p3(value.p3);                    \r\n            node.r3(value.r3);\r\n            node.s3(value.s3);\r\n            nodes.push(node);             \r\n            res.continue();\r\n        }else{\r\n            if(nodes.length){\r\n                dataModel.clear();\r\n                nodes.forEach(function(node){\r\n                    dataModel.add(node);                         \r\n                });\r\n                console.log(dataModel.size() + ' datas are restored');\r\n            }             \r\n        }       \r\n    };    \r\n    return '';\r\n}\r\nfunction clear(){\r\n    var tx = db.transaction(\"meters\", \"readwrite\");\r\n    var store = tx.objectStore(\"meters\");\r\n    var req = store.openCursor();\r\n    var count = 0;\r\n    req.onsuccess = function(event) {        \r\n        var res = event.target.result;\r\n        if(res){\r\n            store.delete(res.value.id);\r\n            res.continue();\r\n            count++;\r\n        }else{\r\n            console.log(count + ' datas are cleared');\r\n        }         \r\n    };\r\n\r\n}<\/pre>\n<p>\u6700\u540e\u662f<a href=\"http:\/\/www.w3.org\/TR\/FileAPI\/\">FileSystem API<\/a>\u76f8\u5f53\u4e8e\u64cd\u4f5c\u672c\u5730\u6587\u4ef6\u7684\u5b58\u50a8\u65b9\u5f0f\uff0c\u76ee\u524d\u652f\u6301\u6d4f\u89c8\u5668\u4e0d\u591a\uff0c\u5176\u63a5\u53e3\u6807\u51c6\u4e5f\u5728\u53d1\u5c55\u5236\u5b9a\u53d8\u5316\u4e2d\uff0c\u4f8b\u5982\u5728\u6211\u5199\u8fd9\u4e2a\u4ee3\u7801\u65f6\u5927\u90e8\u5206\u6587\u732e\u4f7f\u7528\u7684webkitStorageInfo\u5df2\u88abnavigator.webkitPersistentStorage\u548cnavigator.webkitTemporaryStorage\u66ff\u4ee3\uff0c\u5b58\u50a8\u7684\u6587\u4ef6\u53ef\u901a\u8fc7filesystem:http:\/\/www.hightopo.com\/persistent\/meters.txt&#8217;\u7684URL\u65b9\u5f0f\u5728chrome\u6d4f\u89c8\u5668\u4e2d\u67e5\u627e\u5230\uff0c\u751a\u81f3\u53ef\u901a\u8fc7filesystem:http:\/\/www.hightopo.com\/persistent\/\u7c7b\u4f3c\u76ee\u5f55\u7684\u8bbf\u95ee\uff0c\u56e0\u6b64\u4e5f\u53ef\u4ee5\u52a8\u6001\u751f\u6210\u56fe\u7247\u5230\u672c\u5730\u6587\u4ef6\uff0c\u7136\u540e\u901a\u8fc7filesystem:http:***\u7684URL\u65b9\u5f0f\u76f4\u63a5\u8d4b\u503c\u7ed9img\u7684html\u5143\u7d20\u7684src\u8bbf\u95ee\uff0c\u56e0\u6b64\u672c\u5730\u5b58\u50a8\u6253\u5f00\u4e86\u4e00\u6247\u65b0\u7684\u95e8\uff0c\u76f8\u4fe1\u4ee5\u540e\u4f1a\u5192\u51fa\u66f4\u591a\u7a00\u5947\u53e4\u602a\u7684\u5947\u8469\u5e94\u7528\u3002<\/p>\n<pre class=\"&quot;brush:javascript\u201d\">navigator.webkitPersistentStorage.queryUsageAndQuota(function (usage, quota) {\r\n        console.log('PERSISTENT: ' + usage + '\/' + quota + ' - ' + usage \/ quota + '%');\r\n    }\r\n);\r\nnavigator.webkitPersistentStorage.requestQuota(2 * 1024 * 1024,\r\n    function (grantedBytes) {\r\n        window.webkitRequestFileSystem(window.PERSISTENT, grantedBytes,\r\n            function (fs) {\r\n                window.fs = fs;\r\n            });\r\n    }\r\n);\r\nfunction save(dataModel) {\r\n    var value = dataModel.serialize();\r\n    fs.root.getFile('meters.txt', {create: true}, function (fileEntry) {\r\n        console.log(fileEntry.toURL());\r\n        fileEntry.createWriter(function (fileWriter) {\r\n            fileWriter.onwriteend = function () {\r\n                console.log(dataModel.size() + ' datas are saved');\r\n            };\r\n            var blob = new Blob([value], {type: 'text\/plain'});\r\n            fileWriter.write(blob);\r\n        });\r\n    });\r\n    return value;\r\n}\r\nfunction restore(dataModel) {\r\n    fs.root.getFile('meters.txt', {}, function (fileEntry) {\r\n        fileEntry.file(function (file) {\r\n            var reader = new FileReader();\r\n            reader.onloadend = function (e) {\r\n                dataModel.clear();\r\n                dataModel.deserialize(reader.result);\r\n                console.log(dataModel.size() + ' datas are restored');\r\n            };\r\n            reader.readAsText(file);\r\n        });\r\n    });\r\n    return '';\r\n}\r\nfunction clear() {\r\n    fs.root.getFile('meters.txt', {create: false}, function(fileEntry) {\r\n        fileEntry.remove(function() {\r\n            console.log(fileEntry.toURL() + ' is removed');\r\n        });\r\n    });    \r\n}<\/pre>\n<p><a href=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-12.53.48-AM.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-346\" alt=\"Screen Shot 2014-12-22 at 12.53.48 AM\" src=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-12.53.48-AM.png\" width=\"977\" height=\"827\" srcset=\"https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-12.53.48-AM.png 977w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-12.53.48-AM-300x253.png 300w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-22-at-12.53.48-AM-200x169.png 200w\" sizes=\"(max-width: 977px) 100vw, 977px\" \/><\/a><\/p>\n<p>Browser-Side\u7684\u5b58\u50a8\u65b9\u5f0f\u8fd8\u5728\u5feb\u901f\u7684\u53d1\u5c55\u4e2d\uff0c\u5176\u5b9e\u9664\u4e86\u4ee5\u4e0a\u51e0\u79cd\u5916\u8fd8\u6709Application Cache\uff0c\u76f8\u4fe1\u5c06\u6765\u8fd8\u4f1a\u6709\u65b0\u79c0\u51fa\u73b0\uff0c\u867d\u7136\u201c\u4e91\u201d\u662f\u5927\u8d8b\u52bf\uff0c\u4f46\u5ba2\u6237\u7aef\u5e76\u975e\u8981\u8d70\u6781\u7aef\u7684\u201c\u7626\u201d\u65b9\u6848\uff0c\u8fd9\u4e48\u591a\u5e74\u5192\u51fa\u4e86\u8fd9\u4e48\u591a\u5ba2\u6237\u7aef\u5b58\u50a8\u65b9\u5f0f\uff0c\u8bf4\u660e\u8ba9\u5ba2\u6237\u7aef\u66f4\u5f3a\u5927\u7684\u5e02\u573a\u9700\u6c42\u662f\u5f3a\u70c8\u7684\uff0c\u5f53\u7136\u76ee\u524d\u52a8\u8361\u9636\u6bb5\u82e6\u903c\u7684\u662f\u5ba2\u6237\u7aef\u7a0b\u5e8f\u5458\uff0c\u9664\u4e86\u8981\u9002\u914dMouse\u548cTouch\uff0c\u8fd8\u8981\u9002\u914d\u5404\u79cd\u5c4f\uff0c\u5982\u4eca\u8fd8\u5f97\u8003\u8651\u9002\u914d\u5404\u79cd\u5b58\u50a8\uff0c\u5e0c\u671b\u672c\u6587\u80fd\u5728\u5927\u5bb6\u9009\u578b\u5ba2\u6237\u7aef\u5b58\u50a8\u65b9\u6848\u65f6\u6709\u70b9\u5e2e\u52a9\uff0c\u6700\u540e\u4e0a\u6bb5\u57fa\u4e8e<a href=\"http:\/\/www.hightopo.com\/\">HT for Web<\/a>\u64cd\u4f5cHTML5\u5b58\u50a8\u793a\u4f8b\u7684\u89c6\u9891\u6548\u679c\uff1a<a href=\"http:\/\/v.youku.com\/v_show\/id_XODUzODU2MTY0.html\">http:\/\/v.youku.com\/v_show\/id_XODUzODU2MTY0.html<\/a><br \/>\n<iframe loading=\"lazy\" src=\"http:\/\/player.youku.com\/embed\/XODUzODU2MTY0\" height=\"498\" width=\"510\" allowfullscreen=\"\" frameborder=\"0\"><\/iframe><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/posts\/344"}],"collection":[{"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/comments?post=344"}],"version-history":[{"count":3,"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/posts\/344\/revisions"}],"predecessor-version":[{"id":349,"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/posts\/344\/revisions\/349"}],"wp:attachment":[{"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/media?parent=344"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/categories?post=344"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/tags?post=344"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}