js的几个库

 <!DOCTYPE html>

 <html>

 <head>

     <title>jQM input file capture</title>

     <meta name="viewport" content="width=device-width, initial-scale=1.0">

     <link rel="stylesheet" href="http://code.jquery.com/mobile/1.3.0/jquery.mobile-1.3.0.min.css" />

     <script src="http://code.jquery.com/jquery-1.8.2.min.js"></script>

     <script src="http://code.jquery.com/mobile/1.3.0/jquery.mobile-1.3.0.min.js"></script>

 </head>

 <body>

     <div data-role="page" id="page">

         <style>

             #preview {

                 width: 80%; max-width: 300px;

             }

             #preview img {

                 width: 100%;

             }

             .hiddenfile {

              width: 0px;

              height: 0px;

              overflow: hidden;

             }

         </style>

         <div data-role="header">

              <h3>Header</h3>

         </div>

         <div data-role="content">

             <button id="chooseFile">Choose file</button>

             <div class="hiddenfile">

               <input type="file"  data-clear-btn="false" name="image" accept="image/*" capture>

             </div>

             <div id="preview">

             </div>

             <ul id="info" data-role="listview" data-inset="true">

             </ul>

         </div>

     </div>

     <script>

     $('#page').on('pageinit', function(){

         $("#chooseFile").click(function(e){

             e.preventDefault();

             $("input[type=file]").trigger("click");

         });

         $("input[type=file]").change(function(){

             var file = $("input[type=file]")[0].files[0];

             $("#preview").empty();

             displayAsImage3(file, "preview");

             $info = $("#info");

             $info.empty();

             if (file && file.name) {

                 $info.append("<li>name:<span>" + file.name + "</span></li>");

             }

             if (file && file.type) {

                 $info.append("<li>size:<span>" + file.type + " bytes</span></li>");

             }

             if (file && file.size) {

                 $info.append("<li>size:<span>" + file.size + " bytes</span></li>");

             }

             if (file && file.lastModifiedDate) {

                 $info.append("<li>lastModifiedDate:<span>" + file.lastModifiedDate + " bytes</span></li>");

             }

             $info.listview("refresh");

         });

     });

     function displayAsImage3(file, containerid) {

         if (typeof FileReader !== "undefined") {

             var container = document.getElementById(containerid),

                 img = document.createElement("img"),

                 reader;

             container.appendChild(img);

             reader = new FileReader();

             reader.onload = (function (theImg) {

                 return function (evt) {

                     theImg.src = evt.target.result;

                 };

             }(img));

             reader.readAsDataURL(file);

         }

     }

     </script>

 </body>

 </html>
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js的几个库

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