js实现限制上传文件大小

时间：2024-12-17 16:35:44
<html>

<head>

<script type="text/javascript">

  var isIE = /msie/i.test(navigator.userAgent) && !window.opera;

  function fileChange(target) {     

    var fileSize = 0;

    if (isIE && !target.files) {

      var filePath = target.value;

      var fileSystem = new ActiveXObject("Scripting.FileSystemObject");

      var file = fileSystem.GetFile (filePath);

      fileSize = file.Size;

    } else {

     fileSize = target.files[0].size;

     }

     var size = fileSize / 1024;

     if(size>10000){

      alert("附件不能大于10M");   

     }   

}

</script>

</head>

<body>

<input type="file" name="contractFileName"  style="width: 500px;" onchange="fileChange(this);"/>

</body>

</html>

　　

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