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js file format verification

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Release： 2016-11-10 13:14:08
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<html>
   
  <head>
   <title>js校验文件格式</title>
   <meta http-equiv=&#39;content-type&#39; content=&#39;text/html;charset=utf-8&#39;>
   <script type="text/javascript" src="jquery-1.4.3.js"></script>
   <script type="text/javascript">
    
     function get(){
      var s = $("#file1").val();
      var fl = s.split(".");
   //常用的文件格式
      var ary = ["doc","docx","xls","xlsx","ppt","gif","jpeg","jpg","png","txt","wps","pdf"];
        
      //文件格式在数组中返回下标，否则返回 -1
     var t= $.inArray(fl[1],ary);
      
     return t==-1;
     
     }
     
   </script>
  </head>
  <body>
   
    <input type="file" id="file1"  >
    <input type="button" onclick="get();" value="文件格式">
  </body>
  
</html>
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