js 获取上传图片的绝对路径

function coursePptChange(){
  var MyTest = ("pptPic").files[0];
  var reader = new FileReader();
  (MyTest);
   = function(theFile) {
  var image = new Image();
   = ;
   = function(){
  if( > 2208 ||  >1242){
  $.("系统提示信息","ppt图片的最大宽度为 2208 像素，最大高度为 1242 像素！","info");
   $("#pptPic").val("");
  return false;
 }
 };
 };
}

jsp:

<input type="file"  name="pptPic" style="width:200px;" οnchange="coursePptChange()"/>