WEB前端解壓ZIP壓縮包
web前端解壓zip文件有什麼用:
只考慮標准浏覽器的話, 服務器只要傳輸壓縮包到客戶端, 節約了帶寬, 而且節約了傳輸時間, 聽起來好像很厲害的說;
如果前端的代碼很多, 而且包含大副的圖片,那麼就可以把js和css和jpg和png等各種數據通過服務端打包成zip傳送到浏覽器, 浏覽器負責解壓, css實用動態生成插入到dom中,js也用globalEval直接執行, jpg或者png各種圖片文件由blob流轉化為image, 直接插入到浏覽器中;
html5支持讀取Blob(二進制大對象, file文件也是繼承了Blob), 並轉化為圖片流或者文字流或者其他流格式, 這也是為什麼浏覽器可以讀取"application/zip"文件的原因;
要在浏覽器中解壓zip文件的話需要引入四個js , 因為UnZipArchive.js依賴了zip.js, mime-type.js和jquery.js , 測試demo如下:
<!DOCTYPE html> <html> <head lang="en"> <meta charset="UTF-8"> <title></title> <script src="http://gildas-lormeau.github.io/zip.js/demos/zip.js"></script> <script src="http://gildas-lormeau.github.io/zip.js/demos/mime-types.js"></script> <script src="http://apps.bdimg.com/libs/jquery/1.9.0/jquery.js"></script> <script src="http://files.cnblogs.com/files/diligenceday/UnZipArchive.js"></script> </head> <body> <h2> demo </h2> <div> <input type="file" id="file"> </div> <ul id="dir"> </ul> <script> $("#file").change(function (e) { var file = this.files[0]; window.un = new UnZipArchive( file ); un.getData( function() { //獲取所以的文件和文件夾列表; var arr = un.getEntries(); //拼接字符串 var str = ""; for(var i=0; i<arr.length; i++ ) { //點擊li的話直接下載文件; str += "<li onclick=download('"+arr[i]+"')>"+arr[i]+"</li>" }; $("#dir").html( str ); }); }); var download = function ( filename ) { un.download( filename ); }; </script> </body> </html>
UnzioarichiveJS 是自己封裝的, 有任何問題的話請及時反饋
解壓ZIP壓縮包的完整DEMO
<!DOCTYPE html> <html> <head lang="en"> <meta charset="UTF-8"> <title></title> <script src="http://gildas-lormeau.github.io/zip.js/demos/zip.js"></script> <script src="http://gildas-lormeau.github.io/zip.js/demos/mime-types.js"></script> <script src="http://apps.bdimg.com/libs/jquery/1.9.0/jquery.js"></script> <style> code{ display: block; padding: 10px; background: #eee; } </style> </head> <body> <div> <h1> 兼容性 </h1> <div> <p> zip.js可以在所有的chrome浏覽器和firefox浏覽器中運行, 可以在safari6和IE10,以及IE10以上運行; </p> <p> 如果要在IE9和safari中運行需要兩個設置: </p> <code> 1:zip.useWebWorkers == false </code> <code> 2:並引用這個JS:https://bitbucket.org/lindenlab/llsd/raw/7d2646cd3f9b/js/typedarray.js </code> </div> <h2> demo </h2> <div> <input type="file" id="file"> </div> <ul id="dir"> </ul> <script> $("#file").change(function (e) { var file = this.files[0]; window.un = new UnZipArchive( file ); un.getData( function() { var arr = un.getEntries(); var str = ""; for(var i=0; i<arr.length; i++ ) { str += "<li onclick=download('"+arr[i]+"')>"+arr[i]+"</li>" }; $("#dir").html( str ); }); }); var download = function ( filename ) { un.download( filename ); }; </script> </div> <script> zip.workerScriptsPath = "http://gildas-lormeau.github.io/zip.js/demos/"; /** * @desc 解壓縮文件的類; * @return UnZipArchive 的實例; * */ var UnZipArchive = function( blob ) { if( !blob ) { alert("參數不正確, 需要一個Blob類型的參數"); return ; }; if( !(blob instanceof Blob) ) { alert("參數不是Blob類型"); return ; }; function noop() {}; this.entries = {}; this.zipReader = {}; var _this = this; this.length = 0; this.onend = noop; this.onerror = noop; this.onprogress = noop; //創建一個延遲對象; var def = this.defer = new $.Deferred(); zip.createReader( new zip.BlobReader( blob ), function(zipReader) { _this.zipReader = zipReader; zipReader.getEntries(function(entries) { _this.entries = entries; //繼續執行隊列; def.resolve(); }); }, this.error.bind(_this) ); }; /** * @desc 把blob文件轉化為dataUrl; * */ UnZipArchive.readBlobAsDataURL = function (blob, callback) { var f = new FileReader(); f.onload = function(e) {callback( e.target.result );}; f.readAsDataURL(blob); }; $.extend( UnZipArchive.prototype, { /** * @desc 獲取壓縮文件的所有入口; * @return ArrayList; * */ "getEntries" : function() { var result = []; for(var i= 0, len = this.entries.length ; i<len; i++ ) { result.push( this.entries[i].filename ); } return result; }, /** * @desc 獲取文件Entry; * @return Entry * */ "getEntry" : function ( filename ) { var entrie; for(var i= 0, len = this.entries.length ; i<len; i++ ) { if( this.entries[i].filename === filename) { return this.entries[i]; }; } }, /** * @desc 下載文件 * @param filename; * @return void; * */ "download" : function ( filename , cb , runoninit) { var _this = this; this.defer = this.defer.then(function() { var def = $.Deferred(); if(!filename) return ; if(runoninit) { return runoninit(); }; var entry = _this.getEntry( filename ); if(!entry)return; entry.getData(new zip.BlobWriter(zip.getMimeType(entry.filename)), function(data) { if( !cb ) { UnZipArchive.readBlobAsDataURL(data, function( dataUrl ) { var downloadButton = document.createElement("a"), URL = window.webkitURL || window.mozURL || window.URL; downloadButton.href = dataUrl; downloadButton.download = filename; downloadButton.click(); def.resolve( dataUrl ); _this.onend(); }); }else{ cb( data ); def.resolve( data ); } }); return def; }); }, /** * @desc 獲取對應的blob數據; * @param filename 文件名; * @param callback回調, 參數為 blob; * @desc 或者可以直接傳一個函數作為zip解壓縮完畢的回調; * */ "getData" : function ( filename, fn ) { if( typeof filename === "string") { this.download(filename, function( blob ) { fn&&fn( blob ); }); }else if( typeof filename === "function") { this.download("test", null, function( blob ) { filename(); }); }; }, "error" : function() { this.onerror( this ); throw new Error("壓縮文件解壓失敗"); } }); </script> </body> </html>
但是浏覽器兼容又是大問題;