js 上传图片预览

 <script language='javascript'>
  function   show(){
  var p=document.getElementById("file1").value;
  document.getElementById("s").innerHTML="<input type=image id=pic width=150 height=100 /> ";
  document.getElementById("pic").src=p;
  //alert(p);
  }
  </script>

  <input type="file" name="file1" id="file1" onpropertychange="show();" />
  <span id="s"></span>