上传图片显示

<input type="file" name="file1" id="file1" size="40" onchange="changeSrc(this)"/>
<img src="about:blank" id="fileChecker" alt="test"  height="18"/>
<script type="text/javascript">
  var oFileChecker = document.getElementById("fileChecker");
  function changeSrc(filePicker)
  {
    oFileChecker.src = filePicker.value;//读图片
  }
</script>