<div id="wrapper">     <input id="fileUpload" type="file" multiple /><br /> <div id="image-holder"> </div></div>

$("#fileUpload").on('change', function () {   //獲取上傳文件的數量  var countFiles = $(this)[0].files.length;   var imgPath = $(this)[0].value;  var extn = imgPath.substring(imgPath.lastIndexOf('.') + 1).toLowerCase();  var image_holder = $("#image-holder");  image_holder.empty();   if (extn == "gif" || extn == "png" || extn == "jpg" || extn == "jpeg") {    if (typeof (FileReader) != "undefined") {       // 循環所有要上傳的圖片      for (var i = 0; i < countFiles; i++) {         var reader = new FileReader();        reader.onload = function (e) {          $("<img />", {            "src": e.target.result,              "class": "thumb-image"          }).appendTo(image_holder);        }         image_holder.show();        reader.readAsDataURL($(this)[0].files[i]);      }     } else {      alert("你的瀏覽器不支持FileReader！");    }  } else {    alert("請選擇圖像文件。");  }});