{"id":1579,"date":"2017-07-05T10:43:56","date_gmt":"2017-07-05T02:43:56","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=1579"},"modified":"2017-07-05T10:50:25","modified_gmt":"2017-07-05T02:50:25","slug":"html5-file-%e4%b8%8e-filereader-%e6%95%99%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=1579","title":{"rendered":"HTML5 File \u4e0e FileReader \u6559\u7a0b"},"content":{"rendered":"<p>\n\tHTML5\u65b0\u589e\u4e86\u5f88\u591a\u7279\u6027\uff0c\u5176\u4e2dFile API\u662f\u975e\u5e38\u91cd\u8981\u7684\u90e8\u5206\u3002\u5728\u8089\u5927\u5e08\u4e2d\uff0c\u6211\u5927\u91cf\u4f7f\u7528\u4e86HTML5\u7684\u6587\u4ef6API\uff0c\u8fd9\u6837\u4e00\u6765\u53ef\u4ee5\u7ed9\u4e88\u7528\u6237\u8fd1\u4e4e\u684c\u9762\u8f6f\u4ef6\u7684\u4f53\u9a8c\uff0c\u4e8c\u6765\u8fd8\u80fd\u51cf\u5c11\u670d\u52a1\u5668\u548c\u5e26\u5bbd\u7684\u6d88\u8017\u3002\u4eca\u5929\u7ec8\u4e8e\u628a\u6700\u540e\u51e0\u4e2a\u95ee\u9898\u89e3\u51b3\u4e86\uff0c\u5728\u8fd9\u91cc\u603b\u7ed3\u4e0bHTML5 File API\u7684\u4f7f\u7528\u3002\n<\/p>\n<h2>\n\tFile \u7528\u9014<br \/>\n<\/h2>\n<p>\n\t\u5728W3C\u9875\u9762\u4e0a\uff0c\u5217\u51fa\u4e86<a href=\"https:\/\/dev.w3.org\/2009\/dap\/file-system\/pub\/FileSystem\/\" name=\"FileSystem\" target=\"_blank\" title=\"FileSystem\">File API\u53ef\u80fd\u7528\u5230\u7684\u573a\u5408<\/a>\uff08\u4ee5\u4e0b\u4e3a\u610f\u8bd1\uff09\uff1a\n<\/p>\n<ol>\n<li>\n\t\t\u65ad\u70b9\u7eed\u4f20<br \/>\n\t\t\u4e0a\u4f20\u65f6\uff0c\u5148\u628a\u76ee\u6807\u6587\u4ef6\u590d\u5236\u5230\u672c\u5730\u6c99\u7bb1\uff0c\u7136\u540e\u5206\u89e3\u9010\u5757\u4e0a\u4f20<br \/>\n\t\t\u6d4f\u89c8\u5668\u5d29\u6e83\u6216\u8005\u7f51\u7edc\u4e2d\u65ad\u4e5f\u6ca1\u5173\u7cfb\uff0c\u56e0\u4e3a\u6062\u590d\u540e\u53ef\u4ee5\u7eed\u4f20\n\t<\/li>\n<li>\n\t\t\u9700\u8981\u5927\u91cf\u5a92\u4f53\u7d20\u6750\u7684\u5e94\u7528\uff0c\u6bd4\u5982\u89c6\u9891\u6e38\u620f<br \/>\n\t\t\u4e0b\u8f7d\u538b\u7f29\u5305\uff0c\u5728\u672c\u5730\u89e3\u538b\uff0c\u5c31\u80fd\u6062\u590d\u4e4b\u524d\u76ee\u5f55\u7ed3\u6784<br \/>\n\t\t\u8de8\u5e73\u53f0<br \/>\n\t\t\u901a\u8fc7\u6e10\u8fdb\u5f0f\u4e0b\u8f7d\uff0c\u8fdb\u5165\u65b0\u5173\u5361\u6216\u8005\u5f00\u542f\u65b0\u529f\u80fd\u5747\u65e0\u9700\u7b49\u5f85\uff0c\u56e0\u4e3a\u73a9\u7684\u65f6\u5019\u6240\u9700\u7d20\u6750\u5df2\u7ecf\u901a\u8fc7\u540e\u53f0\u4e0b\u8f7d\u5b8c\u6210\u4e86<br \/>\n\t\t\u4ece\u672c\u5730\u7f13\u5b58\u4e2d\u76f4\u63a5\u8bfb\u53d6\u7d20\u6750\uff0c\u901f\u5ea6\u98de\u5feb<br \/>\n\t\t\u4e8c\u8fdb\u5236\u6587\u4ef6\u4e5f\u4e0d\u5728\u8bdd\u4e0b<br \/>\n\t\t\u4f7f\u7528\u538b\u7f29\u5305\u53ef\u4ee5\u5927\u5927\u51cf\u8f7b\u5e26\u5bbd\u548c\u670d\u52a1\u5668\u6d88\u8017\uff0c\u4e5f\u907f\u514d\u4e86\u9891\u7e41\u4e0b\u8f7d\u788e\u7247\u6587\u4ef6\u5e26\u6765\u7684\u68c0\u7d22\u95ee\u9898\n\t<\/li>\n<li>\n\t\t\u79bb\u7ebf\u56fe\u7247\/\u97f3\u9891\u7f16\u8f91\u5668\u901a<br \/>\n\t\t\u4e0d\u6015\u9891\u7e41\u8bfb\u5199\u5927\u91cf\u6570\u636e<br \/>\n\t\t\u53ea\u60f3\u91cd\u5199\u6587\u4ef6\u7684\u67d0\u4e9b\u90e8\u5206\u4e5f\u80fd\u505a\u5230\uff08\u6bd4\u5982\u4fee\u6539ID3\u6216\u8005EXIF\u4fe1\u606f\uff09<br \/>\n\t\t\u521b\u5efa\u76ee\u5f55\u7ec4\u7ec7\u9879\u76ee\u540e\u7528\u8d77\u6765\u8212\u670d\u591a\u4e86<br \/>\n\t\t\u7f16\u8f91\u5b8c\u7684\u6587\u4ef6\u8fd8\u80fd\u88abiTunes\u3001Picasa\u4e4b\u7c7b\u7684\u672c\u5730\u5e94\u7528\u8bbf\u95ee\n\t<\/li>\n<li>\n\t\t\u79bb\u7ebf\u89c6\u9891\u64ad\u653e\u5668<br \/>\n\t\t\u4e0b\u8f7d\u8d85\u8fc71G\u7684\u5927\u6587\u4ef6\uff0c\u5c06\u6765\u60f3\u770b\u518d\u770b<br \/>\n\t\t\u53ef\u4ee5\u5728\u4e0d\u540c\u65f6\u95f4\u70b9\u95f4\u6765\u56de\u8df3\u8f6c\u64ad\u653e<br \/>\n\t\t\u80fd\u591f\u7ed9Video\u6807\u7b7e\u63d0\u4f9bURL<br \/>\n\t\t\u5373\u4fbf\u7247\u5b50\u8fd8\u6ca1\u4e0b\u5b8c\uff0c\u4e5f\u80fd\u628a\u4e0b\u8f7d\u5230\u7684\u90e8\u5206\u5148\u7779\u4e3a\u5feb<br \/>\n\t\t\u8fd8\u80fd\u4efb\u610f\u622a\u53d6\u4e00\u6bb5\u89c6\u9891\u4ea4\u7ed9Video\u6807\u7b7e\u64ad\u653e\n\t<\/li>\n<li>\n\t\t\u79bb\u7ebf\u90ae\u4ef6\u5ba2\u6237\u7aef<br \/>\n\t\t\u4e0b\u8f7d\u4fdd\u5b58\u9644\u4ef6\u5230\u672c\u5730\u81ea\u4e0d\u5fc5\u8bf4<br \/>\n\t\t\u65ad\u7f51\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u7f13\u5b58\u7528\u6237\u8981\u4e0a\u4f20\u7684\u9644\u4ef6\uff0c\u4ee5\u540e\u518d\u4e0a\u4f20<br \/>\n\t\t\u9700\u8981\u65f6\u53ef\u4ee5\u5217\u51fa\u7f13\u5b58\u91cc\u7684\u9644\u4ef6\uff0c\u901a\u8fc7\u7f29\u7565\u56fe\u663e\u793a\uff0c\u9884\u89c8\u540e\u4e0a\u4f20<br \/>\n\t\t\u80fd\u50cf\u6b63\u5e38\u670d\u52a1\u5668\u90a3\u6837\u89e6\u53d1\u6807\u51c6\u7684\u4e0b\u8f7d\u52a8\u4f5c<br \/>\n\t\t\u4e0d\u4ec5\u80fd\u4f7f\u7528XHR\u4e00\u6b21\u6027\u4e0a\u4f20\u5168\u90e8\u5185\u5bb9\uff0c\u8fd8\u53ef\u4ee5\u628a\u90ae\u4ef6\u548c\u9644\u4ef6\u62c6\u89e3\u6210\u5c0f\u5757\u4f9d\u6b21\u53d1\u9001\n\t<\/li>\n<\/ol>\n<p>\n\t\u542c\u8d77\u6765\u90fd\u662f\u4e9b\u4ee4\u4eba\u632f\u594b\u7684\u529f\u80fd\uff0c\u5b9e\u9645\u7528\u8d77\u6765\u8fd8\u662f\u8981\u8e29\u70b9\u5751\u3002\u4e0b\u9762\u5c31\u628a\u6211\u7684\u7ecf\u9a8c\u5206\u4eab\u4e00\u4e0b\u3002\n<\/p>\n<h2>\n\tFileReader<br \/>\n<\/h2>\n<p>\n\t\u5f88\u591a\u6d4f\u89c8\u5668\u90fd\u5b9e\u73b0\u4e86FileReader\uff0c\u5173\u4e8e\u5b83\u7684\u6559\u7a0b\u548c\u6587\u7ae0\u5f88\u591a\uff0c\u800c\u4e14\u5e38\u4e0e\u540c\u6837\u88abHTML5\u5f15\u5165\u7684DND\uff08Drag &amp; Drop\uff09API\u8fde\u7528\uff0c\u4ee5\u652f\u6301&ldquo;\u4e0a\u4f20\u56fe\u7247\u6587\u4ef6\u524d\u5148\u9884\u89c8&rdquo;\u7684\u529f\u80fd\u3002\u6bd4\u5982\uff1a\n<\/p>\n<ol>\n<li>\n\t\t<a href=\"http:\/\/www.html5rocks.com\/en\/tutorials\/dnd\/basics\/\">NATIVE HTML5 DRAG AND DROP<\/a>\n\t<\/li>\n<li>\n\t\t<a href=\"http:\/\/www.html5rocks.com\/en\/tutorials\/file\/dndfiles\/\">Reading local files in JavaScript<\/a>\n\t<\/li>\n<li>\n\t\t<a href=\"http:\/\/www.thebuzzmedia.com\/html5-drag-and-drop-and-file-api-tutorial\/\">HTML5 Drag and Drop Upload and File API Tutorial<\/a>\n\t<\/li>\n<\/ol>\n<p>\n\t\u6240\u4ee5\u8fd9\u4e2a\u4e3b\u9898\u6211\u5c31\u4e0d\u518d\u591a\u7740\u7b14\u58a8\u53bb\u5199\u4e86\uff0c\u503c\u5f97\u6ce8\u610f\u7684\u6709\u4ee5\u4e0b\u51e0\u70b9\uff1a\n<\/p>\n<ul>\n<li>\n\t\t\u53ea\u6709 &lt;input type=&quot;file&quot; \/&gt; \u548c\u62d6\u62fd\u6587\u4ef6\u540e\u53ef\u4ee5\u83b7\u5f97 FileList\uff0c\u65e0\u6cd5\u901a\u8fc7URL\u76f4\u63a5\u8bfb\u53d6\u6587\u4ef6\uff08\u540e\u9762\u8981\u8bf4\u5230\u7684\u672c\u5730\u6587\u4ef6\u53ef\u4ee5\uff09\n\t<\/li>\n<li>\n\t\tFileList \u5f62\u4f3c\u6570\u7ec4\uff0c\u53ef\u4ee5\u7528\u811a\u6807\u53d6\u5143\u7d20\uff0c\u800c\u4e14\u6709length\u5c5e\u6027\uff0c\u4f46\u5b83\u672c\u8eab\u5e76\u4e0d\u662f\u6570\u7ec4\uff0c\u4e0d\u652f\u6301 concat \u548c slice \u7b49\u65b9\u6cd5\uff0c\u8981\u64cd\u4f5c\u53ea\u80fd\u904d\u5386\uff0c\u6216\u8005\u7528 Array.prototype.slice.call()\n\t<\/li>\n<\/ul>\n<h2>\n\t\u672c\u5730\u6587\u4ef6<br \/>\n<\/h2>\n<p>\n\t\u8fd9\u91cc\u5fc5\u987b\u89e3\u91ca\u4e00\u4e0b&ldquo;\u672c\u5730\u6587\u4ef6&rdquo;\u7684\u6982\u5ff5\u3002\u672c\u5730\u6587\u4ef6\u662fHTML5\u672c\u5730\u5b58\u50a8\u7684\u4e00\u90e8\u5206\uff08\u4e0d\u7279\u6307\u90a3\u4e2a localStorage\uff09\uff0c\u672c\u5730\u5b58\u50a8\u73b0\u5728\u5206\u4e3a4\u4e2a\u7b49\u7ea7\uff1a\n<\/p>\n<ul>\n<li>\n\t\tCookie\uff0c\u6700\u53e4\u8001\uff0c100K\u9650\u5236\uff0c\u901a\u7528\n\t<\/li>\n<li>\n\t\tlocalStorage\uff0c\u65b0\u589e\uff0c\u5404\u6d4f\u89c8\u5668\u7684\u5bb9\u91cf\u9650\u5236\u4e0d\u7b49\uff0c\u91c7\u7528&ldquo;\u952e\uff0d\u503c&rdquo;\u5bf9\u5e94\u7684\u65b9\u5f0f\u5b58\u50a8\uff0c\u6309\u57df\u5212\u5206\u6c99\u7bb1\uff0c\u4e0d\u80fd\u8de8\u57df\u8bfb\u5199\u6570\u636e\n\t<\/li>\n<li>\n\t\t\u6570\u636e\u5e93\uff0c\u65b0\u589e\uff0c\u5bb9\u91cf\u9650\u5236\u4e0d\u7b49\uff0c\u6807\u51c6\u4e0d\u4e00\n\t<\/li>\n<li>\n\t\t\u672c\u5730\u6587\u4ef6\uff0c\u65b0\u589e\uff0c\u76ee\u524d\u53ea\u6709Chrome 12+\u652f\u6301\uff1b\u5168\u4f53\u57df\u7684\u4e34\u65f6\u6587\u4ef6\u5171\u4eab1G\u7a7a\u95f4\uff0c\u6bcf\u4e2a\u57df\u9700\u5355\u72ec\u8bf7\u6c42\u6301\u4e45\u5316\u5b58\u50a8\u7a7a\u95f4\uff1b\u4e0d\u80fd\u8de8\u57df\u64cd\u4f5c\uff0c\u4f46\u540c\u57df\u4e0b\u672c\u5730\u6587\u4ef6\u548c\u8fdc\u7a0b\u6587\u4ef6\u4e4b\u95f4\u4e0d\u7b97\u8de8\u57df\n\t<\/li>\n<\/ul>\n<blockquote>\n<p>\n\t\tWindows\u7684\u5b58\u50a8\u8def\u5f84\u4e3a\uff1aC:\\Users\\\u7528\u6237\u540d\\AppData\\Local\\Google\\Chrome\\User Data\\Default\\File System\uff1b<br \/>\n\t\tMac\u7684\u5b58\u50a8\u8def\u5f84\u4e3a\uff1a~\/Library\/Application Support\/Google\/Chrome\/Default\/File System\/\u3002<br \/>\n\t\t\u4e0d\u80fd\u50cf\u5bf9\u666e\u901a\u6587\u4ef6\u90a3\u6837\u76f4\u63a5\u64cd\u4f5c\u5b83\u4eec\u7684\u771f\u8eab\uff0c\u53ea\u80fd\u7528JavaScrip\u3002\n\t<\/p>\n<\/blockquote>\n<p>\n\t\u8fd9\u91cc\u7684&ldquo;\u672c\u5730\u6587\u4ef6&rdquo;\u5e76\u4e0d\u662f\u6211\u4eec\u901a\u5e38\u610f\u4e49\u4e0a\u8bf4\u7684\u6587\u4ef6\uff0c\u6ca1\u6709\u76f4\u63a5\u5b58\u653e\u5728\u64cd\u4f5c\u7cfb\u7edf\u7684\u6587\u4ef6\u4f53\u7cfb\u4e2d\uff0c\u76f4\u63a5\u641c\u7d22\u6587\u4ef6\u540d\u662f\u627e\u4e0d\u5230\u7684\u3002\u53ef\u4ee5\u7528&ldquo;filesystem:http:\/\/domain\/temporary\/\u6587\u4ef6\u540d&rdquo;\uff08\u5047\u8bbe\u57df\u540d\u662fdomain\uff09\u6765\u8bbf\u95ee\uff0c\u6bd4\u5982\uff1a\n<\/p>\n<pre class=\"brush:xml;\">\r\n\/\/ \u7ecf\u672c\u5730\u73af\u5883\u4e0b\u7684js\u5199\u5165\u7684\u6587\u4ef6\r\n&lt;img src=&quot;filesystem:file:\/\/\/temporary\/MG_8764.jpg&quot; \/&gt;\r\n\/\/ \u7ecf\u8fdc\u7a0b\u73af\u5883\u4e0b\u7684js\u5199\u5165\u7684\u6587\u4ef6\r\n&lt;img src=&quot;filesystem:http:\/\/blog.meathill.net\/temporary\/MG_8764.jpg&quot; \/&gt;<\/pre>\n<p>\n\t\u672c\u5730\u73af\u5883\u4e0b\uff0c\u8fd9\u4e2aAPI\u540c\u6837\u53d7\u5230\u9650\u5236\uff0c\u9700\u8981\u5728Chrome\u542f\u52a8\u65f6\u6dfb\u52a0\u53c2\u6570\uff1a&#8211;allow-file-access-from-files \u65b9\u53ef\u6b63\u5e38\u4f7f\u7528\u3002\n<\/p>\n<p>\n\t\u540e\u9762\u51e0\u8282\u7684\u5185\u5bb9\u57fa\u672c\u90fd\u662f\u6211\u4ece EXPLORING THE FILESYSTEM APIS \u548c <a href=\"https:\/\/dev.w3.org\/2009\/dap\/file-system\/pub\/FileSystem\/\" name=\"FileSystem\" target=\"_blank\" title=\"FileSystem\">File API: Directories and System<\/a> \u4e2d\u5b66\u5230\u7684\u3002\u76ee\u524d\u5173\u4e8e\u672c\u5730\u6587\u4ef6API\u7684\u4ecb\u7ecd\u5f88\u5c11\uff0c\u5e94\u7528\u4e5f\u4e0d\u591a\uff08\u6bd5\u7adf\u4ec5\u9650Chrome\uff09\uff0c\u4e0d\u8fc7\u770b\u770b\u90a3\u4e9b\u4ee4\u4eba\u5fc3\u52a8\u7684\u5e94\u7528\u573a\u666f\uff0c\u76f8\u4fe1\u4e0d\u4e45\u6211\u4eec\u5c31\u80fd\u5728\u66f4\u591a\u6d4f\u89c8\u5668\u91cc\u770b\u5230\u5b83\u7684\u8eab\u5f71\u4e86\u3002\n<\/p>\n<p>\n\t\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u8fd8\u662f\u8fb9\u770b\u4ee3\u7801\u8fb9\u8fdb\u884c\u5427\u3002\u64cd\u4f5c\u672c\u5730\u6587\u4ef6\u524d\u9700\u8981\u8bf7\u6c42\u7a7a\u95f4\uff1a\n<\/p>\n<pre class=\"brush:xml;\">\r\n\/\/ \u5224\u65ad\u662f\u4f55\u79cd\u6d4f\u89c8\u5668\uff0c\u4f7f\u7528\u4e0d\u540c\u7684\u51fd\u6570\r\nwindow.requestFileSystem  = window.requestFileSystem || window.webkitRequestFileSystem;\r\n\/\/ type \u7c7b\u578b\uff0cTEMPORARY \u4e34\u65f6\uff0c\u6240\u6709\u6587\u4ef6\u5171\u4eab1G\u7a7a\u95f4\uff1b\u6216\u8005PERSISTENT \u6c38\u4e45\uff0c\u9700\u5355\u72ec\u8bf7\u6c42\r\n\/\/ size \u5bb9\u91cf\uff0c\u5355\u4f4d\u662f\u5b57\u8282\r\n\/\/ \u6210\u529f\u5931\u8d25\u4e24\u4e2a\u56de\u8c03\u51fd\u6570\uff0c\u540e\u9762\u4ecd\u4f1a\u5927\u91cf\u51fa\u73b0\r\nwindow.requestFileSystem(type, size, successCallback, opt_errorCallback);<\/pre>\n<p>\n\t\u8bf7\u6c42\u7a7a\u95f4\u6210\u529f\u540e\uff0c\u4f1a\u8c03\u7528\u6210\u529f\u7684\u56de\u8c03\u51fd\u6570\uff0c\u5e76\u4f20\u5165FileSystem\u7684\u5b9e\u4f8b\uff0c\u6211\u4eec\u53ef\u4ee5\u628a\u5b83\u5b58\u8d77\u6765\uff0c\u4ee5\u5907\u540e\u7528\u3002\n<\/p>\n<pre class=\"brush:jscript;\">\r\nfunction fileSystemReadyHandler(fs) {\r\n  fileSystem = fs;\r\n}<\/pre>\n<p>\n\t\u9519\u8bef\u7684\u56de\u8c03\u51fd\u6570\u5199\u4e00\u4e2a\u901a\u7528\u7684\u5c31\u884c\u4e86\uff0c\u4ee5\u540e\u51e0\u4e4e\u6bcf\u6b21\u90fd\u8981\u7528\u5230\uff1a\n<\/p>\n<pre class=\"brush:jscript;\">\r\nfunction errorHandler(e) {\r\n  var msg = &#39;&#39;;\r\n  switch (e.code) {\r\n    case FileError.QUOTA_EXCEEDED_ERR:\r\n      msg = &#39;QUOTA_EXCEEDED_ERR&amp;&#39;;\r\n      break;\r\n    case FileError.NOT_FOUND_ERR:\r\n      msg = &#39;NOT_FOUND_ERR&#39;;\r\n      break;\r\n    case FileError.SECURITY_ERR:\r\n      msg = &#39;SECURITY_ERR&#39;;\r\n      break;\r\n    case FileError.INVALID_MODIFICATION_ERR:\r\n      msg = &#39;INVALID_MODIFICATION_ERR&#39;;\r\n      break;\r\n    case FileError.INVALID_STATE_ERR:\r\n      msg = &#39;INVALID_STATE_ERR&#39;;\r\n      break;\r\n    default:\r\n      msg = &#39;Unknown Error&#39;;\r\n      break;\r\n  };\r\n  console.log(&#39;Error: &#39; + msg);\r\n}<\/pre>\n<p>\n\t\u8bf7\u6c42\u4e34\u65f6\u7a7a\u95f4\uff08TEMPORARY\uff09\u5c31\u8fd9\u4e48\u7b80\u5355\uff1b\u8bf7\u6c42\u6301\u4e45\u5316\u5b58\u50a8\u7a7a\u95f4\uff08PERSISTENT\uff09\u7a0d\u5fae\u590d\u6742\u4e9b\uff0c\u56e0\u4e3a\u4e34\u65f6\u5b58\u50a8\u662f\u6240\u6709\u5e94\u7528\u5171\u4eab1G\u7a7a\u95f4\uff0c\u800c\u6301\u4e45\u5316\u5b58\u50a8\u5219\u662f\u6309\u7167\u57df\u6765\u5355\u72ec\u6388\u4e88\u7a7a\u95f4\uff0c\u6240\u4ee5\u540e\u8005\u540e\u5fc5\u987b\u7ecf\u8fc7\u7528\u6237\u8bb8\u53ef\u624d\u884c\u3002\u4ee3\u7801\u65b9\u9762\u8981\u5728 requestFileSystem \u4e4b\u524d\uff0c\u5148\u8bf7\u6c42\u7a7a\u95f4\uff0c\u7528\u6237\u8bb8\u53ef\u540e\u65b9\u53ef\u7ee7\u7eed\uff1a\n<\/p>\n<pre class=\"brush:jscript;\">\r\nwindow.webkitStorageInfo.requestQuota(PERSISTENT, 1024*1024, function(grantedBytes) {\r\n  window.requestFileSystem(PERSISTENT, grantedBytes, fileSystemReadyHandler, errorHandler);\r\n}, function(e) {\r\n  console.log(&#39;Error&#39;, e);\r\n});<\/pre>\n<p>\n\tChrome\u4f1a\u964d\u4e0b\u9ec4\u6761\uff0c\u8be2\u95ee\u7528\u6237\u662f\u5426\u5141\u8bb8\u8be5\u57df\u4f7f\u7528\u6301\u4e45\u5316\u5b58\u50a8\uff0c\u7528\u6237\u540c\u610f\u540e\u624d\u4f1a\u8bf7\u6c42FileSystem\u3002\n<\/p>\n<h2>\n\t\u590d\u5236\u6587\u4ef6<br \/>\n<\/h2>\n<p>\n\t\u590d\u5236\u6587\u4ef6\u6307\u628a\u6587\u4ef6\u4ece\u64cd\u4f5c\u7cfb\u7edf\u7684\u6587\u4ef6\u7cfb\u7edf\u590d\u5236\u5230\u672c\u5730\u6587\u4ef6\u7684\u6587\u4ef6\u7cfb\u7edf\u4e2d\u3002\u8fd9\u4e2a\u64cd\u4f5c\u5f88\u7b80\u5355\uff0c\u4e5f\u5f88\u6709\u4ee3\u8868\u6027\uff0c\u8bf7\u5148\u770b\u4ee3\u7801\uff1a\n<\/p>\n<pre class=\"brush:jscript;\">\r\nthis.clone = function (file) {\r\n  \/\/ file \u5373\u901a\u8fc7\u62d6\u62fd\u6216\u8005&lt;input type=&quot;file&quot; \/&gt;\u9009\u62e9\u4ea7\u751f\u7684File\u5b9e\u4f8b\r\n  targetFile = file;\r\n  \/\/ create true\u8868\u793a\u5982\u679c\u8be5\u6587\u4ef6\u4e0d\u5b58\u5728\uff0c\u5219\u521b\u5efa\u4e4b\r\n  fileSystem.root.getFile(file.name, {create: true}, fileEntry_cloneReadyHandler, errorHandler);\r\n}\r\nfunction fileEntry_cloneReadyHandler(fileEntry) {\r\n  \/\/ \u83b7\u53d6\u672c\u5730\u6587\u4ef6\u7684URL\uff0c\u53ef\u4ee5\u8d4b\u7ed9img\u7684src\u5c5e\u6027\uff0c\u4e00\u822c\u662ffilesystem:\/\/domain:\/\/temporary\u6216\u8005persistent\/\u8def\u5f84\/\u6587\u4ef6\u540d\r\n  fileURL = fileEntry.toURL();\r\n  fileEntry.createWriter(fileWriter_cloneReadyHandler, errorHandler);\r\n}\r\nfunction fileWriter_cloneReadyHandler(fileWriter) {\r\n  \/\/ onwrite\u7684\u8bdd\u53ef\u80fd\u6587\u4ef6\u8fd8\u6ca1\u5199\u5b8c\uff0c\u6240\u4ee5\u6700\u597d\u7528onwriteend\uff0c\u8fd9\u70b9\u6211\u53c2\u8003\u7684\u6559\u7a0b\u4e2d\u6ca1\u6709\u63d0\u5230\r\n  fileWriter.onwriteend = function(e) {\r\n    console.log(&#39;Write completed.&#39;);\r\n  };\r\n  fileWriter.onerror = function(e) {\r\n    console.log(&#39;Write failed: &#39; + e.toString());\r\n  };\r\n  fileWriter.write(targetFile);\r\n  targetFile = null;\r\n}\r\n<\/pre>\n<p>\n\t\u51e0\u4e4e\u6240\u6709\u7684\u6587\u4ef6\u578b\u64cd\u4f5c\u90fd\u5305\u62ec\u4ee5\u4e0a\u4e09\u6b65\uff1a\u83b7\u53d6\u6587\u4ef6\u3001\u521b\u5efa FileWriter\u3001\u5199\u5165\u3002\u4e0e\u6211\u4eec\u65e5\u5e38\u7684\u6587\u4ef6\u64cd\u4f5c\u4e0d\u592a\u4e00\u6837\uff0cHTML5\u7684File API\u8981\u5148\u627e\u5230\u6216\u521b\u5efa\u6587\u4ef6\uff0c\u7136\u540e\u518d\u5bf9\u6587\u4ef6\u8fdb\u884c\u64cd\u4f5c\uff0c\u6240\u4ee5\u6587\u4ef6\u7684URL\u5728 getFile \u4e4b\u540e\u5c31\u5df2\u7ecf\u786e\u5b9a\u4e0b\u6765\u3002\n<\/p>\n<p>\n\tgetFile \u67094\u4e2a\u53c2\u6570\uff0c\u5206\u522b\u662f\u6587\u4ef6\u540d\uff08\u6587\u4ef6\u8def\u5f84\u6211\u8fd9\u6b21\u6ca1\u7528\u5230\uff0c\u6240\u4ee5\u8fd9\u7bc7\u6587\u7ae0\u4e2d\u4e0d\u4f1a\u63d0\u53ca\uff09\u3001\u6587\u4ef6\u5904\u7406\u7b56\u7565\u3001\u6210\u529f\u56de\u8c03\u51fd\u6570\u3001\u9519\u8bef\u56de\u8c03\u51fd\u6570\u3002\u6309\u7167w3c\u89c4\u8303\uff0c\u6587\u4ef6\u5904\u7406\u7b56\u7565\u6709\u4e24\u4e2a\u53c2\u6570\uff0c\u5206\u522b\u662f create \u548c exclusive\u3002\u524d\u8005\u4ee3\u8868\u5982\u679c\u76ee\u6807\u6587\u4ef6\u4e0d\u5b58\u5728\uff0c\u662f\u5426\u521b\u5efa\uff1b\u540e\u8005\u4ee3\u8868\u5982\u679c\u76ee\u6807\u6587\u4ef6\u5df2\u5b58\u5728\uff0c\u662f\u5426\u629b\u51fa\u5f02\u5e38\uff0c\u5728\u540e\u9762&ldquo;\u5199\u6587\u4ef6&rdquo;\u4e00\u8282\u91cc\u4f1a\u7279\u522b\u8bb2\u89e3\u8fd9\u4e2a\u53c2\u6570\u7684\u7528\u6cd5\u3002\n<\/p>\n<h2>\n\t\u5199\u6587\u4ef6<br \/>\n<\/h2>\n<p>\n\t\u4e0e\u590d\u5236\u6587\u4ef6\u4e0d\u540c\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u8f93\u51fa\u7684\u6587\u4ef6\u53ef\u7528\uff0c\u6211\u4eec\u9700\u8981\u9009\u62e9\u5408\u9002\u7684\u6587\u4ef6\u683c\u5f0f\u548c\u6587\u4ef6\u7c7b\u578b\u3002\u8fd9\u91cc\u6211\u59d1\u4e14\u5047\u8bbe\u8f93\u5165\u7684\u5185\u5bb9\u90fd\u662f\u5b57\u7b26\u4e32\uff0c\u76f4\u63a5\u4ee5\u6587\u672c\u6587\u4ef6\u6765\u4fdd\u5b58\u5c31\u53ef\u4ee5\u4e86\u3002\u81f3\u4e8e\u4e8c\u8fdb\u5236\u6587\u4ef6\u540e\u9762\u518d\u8ba8\u8bba\u3002\u7ee7\u7eed\u770b\u4ee3\u7801\u5427\uff1a\n<\/p>\n<pre class=\"brush:jscript;\">\r\nthis.save = function (name, content, type) {\r\n  fileName = name;\r\n  fileContent = content;\r\n  fileType = type || &#39;text\/plain&#39;;\r\n  fileSystem.root.getFile(fileName, {create: true, exclusive: true}, fileEntry_saveReadyHandler, errorHandler);\r\n}\r\nfunction fileEntry_saveReadyHandler(fileEntry) {\r\n  fileURL = fileEntry.toURL();\r\n  fileEntry.createWriter(fileWriter_saveReadyHandler, errorHandler);\r\n}\r\nfunction errorHandler(error) {\r\n&nbsp; \/\/ \u524d\u9762\u53ef\u4ee5\u7167\u642c\uff0c\u540e\u9762\u9700\u8981\u589e\u52a0\u4e00\u4e2a\u5904\u7406\r\n  \/\/ \u5f53\u6587\u4ef6\u5df2\u5b58\u5728\u65f6\uff0c\u5e94\u5148\u5220\u9664\r\n&nbsp; if (error.code == FileError.INVALID_MODIFICATION_ERR) {\r\n&nbsp; &nbsp; fileSystem.root.getFile(fileName, {create: false}, fileEntry_removeReadyHandler, errorHandler);\r\n&nbsp; }\r\n}\r\nfunction fileWriter_saveReadyHandler(fileWriter) {\r\n  fileWriter.onwriteend = function (event) {\r\n    console.log(&#39;Write completed.&#39;);\r\n  };\r\n  fileWriter.onerror = function (error) {\r\n    console.log(&#39;Write failed: &#39; + error.toString());\r\n  };\r\n\r\n  var blob,\r\n      byteArray\r\n      i = len = 0;\r\n  if (\/text\/i.test(fileType)) {\r\n    blog = new Blob([fileContent]);\r\n  } else {\r\n    len = fileContent.length;\r\n    byteArray = new Uint8Array(len);\r\n    for (; i &lt; len; i++) {\r\n      byteArray[i] = fileContent.charCodeAt(i) &amp; 0xFF;\r\n    }\r\n    blob = new Blob([byteArray], {type: fileType});\r\n  }\r\n  fileWriter.write(blob);\r\n  fileContent = null;\r\n}\r\nfunction fileEntry_removeReadyHandler(fileEntry) {\r\n  fileEntry.remove(fileRemoveHandler, errorHandler);\r\n}\r\nfunction fileRemoveHandler() {\r\n  self.save(fileName, fileContent, fileType);\r\n}<\/pre>\n<p>\n\t\u53ef\u4ee5\u770b\u5230\uff0c\u5927\u4f53\u4e0a\u8fd8\u662f\u4e09\u6b65\uff1a\u83b7\u53d6\u6587\u4ef6\uff0c\u521b\u5efa FileWriter\u3001\u5199\u5165\u5185\u5bb9\uff0c\u4e0d\u8fc7\u589e\u52a0\u4e86\u5f88\u591a\u5f02\u5e38\u5904\u7406\u3002\u8fd9\u5c31\u8981\u56de\u5230\u524d\u9762\u63d0\u5230\u7684\u90a3\u4e2agetFile\uff0c\u5b83\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570&ldquo;\u6587\u4ef6\u5904\u7406\u7b56\u7565&rdquo;\uff0c\u91cc\u9762\u6709\u4e2a\u5b57\u6bb5\u53eb exclusive\uff0c\u4ee3\u8868\u5982\u679c\u76ee\u6807\u6587\u4ef6\u5df2\u7ecf\u5b58\u5728\uff0c\u662f\u5426\u629b\u51fa\u5f02\u5e38\u3002\u56e0\u4e3a FileWriter \u5199\u5165\u5185\u5bb9\u65f6\u4ee5\u6587\u4ef6\u6307\u9488\u4e3a\u6807\u51c6\uff0c\u4ece0\u5f00\u59cb\uff0c\u9010\u5b57\u8282\u5199\u5165\uff0c\u76f4\u5230 fileContent \u5199\u5b8c\uff1b\u5f53\u76ee\u6807\u6587\u4ef6\u5b58\u5728\u65f6\uff0c\u5b83\u4ecd\u4f1a\u8fd9\u4e48\u505a\uff0c\u8fd9\u79cd\u9010\u5b57\u8282\u8986\u76d6\u7684\u65b9\u5f0f\u5bfc\u81f4\u5982\u679c\u5148\u524d\u7684\u5185\u5bb9\u6bd4\u540e\u5199\u5165\u7684\u5185\u5bb9\u8981\u957f\uff0c\u6587\u4ef6\u5185\u5bb9\u5c31\u4f1a\u662f\u65b0\u8001\u76f8\u63a5\u7684\u3002\u8fd9\u660e\u663e\u4e0d\u662f\u6211\u4eec\u5e0c\u671b\u7684\u7ed3\u679c\uff0c\u6240\u4ee5\u6211\u8981\u4fee\u6539 errorHandler \uff0c\u5f53\u9047\u5230 FileError.INVALID_MODIFICATION_ERR \u65f6\u5c31\u5148\u628a\u76ee\u6807\u6587\u4ef6\u5220\u9664\uff0c\u7136\u540e\u518d\u91cd\u65b0\u5199\u5165\u3002\n<\/p>\n<p>\n\t\u5220\u9664\u6587\u4ef6\u7684\u64cd\u4f5c\u662f\u4e24\u6b65\uff1a\u83b7\u53d6\u6587\u4ef6\u3001\u5220\u9664\u6587\u4ef6\u3002\u5b8c\u6210\u4e4b\u540e\uff0c\u518d\u6b21\u8c03\u7528 save \u65b9\u6cd5\uff0c\u5199\u5165\u5185\u5bb9\u3002\n<\/p>\n<p>\n\tBlob \u662fHTML5\u4e2d\u5f15\u5165\u7684\u65b0\u7c7b\u578b\uff0c\u4ee3\u8868&ldquo;\u4e0d\u53ef\u53d8\u7684\u539f\u59cb\u4e8c\u8fdb\u5236\u6570\u636e&rdquo;\u3002\u5b83\u662f\u6240\u6709\u6587\u4ef6\u7684\u57fa\u7840\uff0c\u53ef\u4ee5\u662f\u4efb\u4f55\u4e00\u79cd\u6587\u4ef6\u7c7b\u578b\u7684\u6570\u636e\u3002\u65b0\u7684\u89c4\u8303\u5f15\u5165\u4e86 Blob \u7684\u6784\u9020\u51fd\u6570\uff0c\u53ef\u4ee5\u63a5\u6536\u4e24\u4e2a\u53c2\u6570\uff1a\u5185\u5bb9 \u548c \u5c5e\u6027\u5305\u3002\u5176\u4e2d\uff0c\u5185\u5bb9 \u53ef\u4ee5\u662f ArrayBuffer\uff08\u540e\u9762\u4f1a\u4ecb\u7ecd\uff09\u3001\u5176\u4ed6 Blob\u3001\u6216\u8005\u6587\u672c\u5b57\u7b26\u4e32\uff0c\u4e0d\u8fc7\u90fd\u9700\u8981\u7528\u6570\u7ec4\u5305\u88f9\u3002\u5c5e\u6027\u5305 \u5219\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u7528\u6765\u6307\u660e\u8be5 Blob \u7684MIME\u7c7b\u578b\u548c\u6362\u884c\u6807\u8bb0\u3002<\/p>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/ws3.sinaimg.cn\/large\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/> --><p><!-- <img decoding=\"async\" src=\"https:\/\/raw.githubusercontent.com\/xmt1139057136\/xttblog\/master\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/>--><img decoding=\"async\" src=\"https:\/\/saas.51autoparts.cn\/api\/admin\/sys-file\/oss\/file?fileName=84db51f8561e448f9a4fda2eff0811f9.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/><\/p><p>\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01<b>\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1a<font color=\"red\">xttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p><p>\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a<a href=\"https:\/\/www.xttblog.com\">\u4e1a\u4f59\u8349<\/a>\uff1a &raquo; <a href=\"https:\/\/www.xttblog.com\/?p=1579\">HTML5 File \u4e0e FileReader \u6559\u7a0b<\/a><\/p><!-- <div class=\"bd-reward-stl\"><button id=\"bdRewardBtn\"><span><\/span><\/button><\/div> -->","protected":false},"excerpt":{"rendered":"<p>HTML5\u65b0\u589e\u4e86\u5f88\u591a\u7279\u6027\uff0c\u5176\u4e2dFile API\u662f\u975e\u5e38\u91cd\u8981\u7684\u90e8\u5206\u3002\u5728\u8089\u5927\u5e08\u4e2d\uff0c\u6211\u5927\u91cf\u4f7f\u7528\u4e86HTML5\u7684\u6587\u4ef6API [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[1202,1320,1315,1205,1316,1321],"class_list":["post-1579","post","type-post","status-publish","format-standard","hentry","category-html5","tag-blob","tag-file","tag-fileerror","tag-filereader","tag-filesystem","tag-filewriter"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/1579","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1579"}],"version-history":[{"count":3,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/1579\/revisions"}],"predecessor-version":[{"id":1582,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/1579\/revisions\/1582"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1579"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1579"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1579"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}