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上传图片前浏览图片

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head>  <title> New Document </title>  <meta name="Generator" content="EditPlus">  <meta name="Author" content="">  <meta name="Keywords" content="">  <meta name="Description" content="">  <script type="text/javascript">  </script> </head> <body>  <form name="form4" id="form4" method="post" action="#"> 	  <input type="file" name="file4" id="file4"  onchange="preview4()" />	  <img id="pic4" src="" alt="图片在此显示" width="120"/>  </form>  <script type="text/javascript">  function preview4(){     	  var x = document.getElementById("file4");     	  var y = document.getElementById("pic4");     	  if(!x || !x.value || !y)            return;      	  var patn = /\.jpg$|\.jpeg$|\.gif$/i;     	  if(patn.test(x.value)){              	  y.src = "file://localhost/" + x.value;   }else{  	alert("您选择的似乎不是图像文件。");   }  }  </script> </body></html>