js中获取文件的大小，判断文件是否操作大小限制，避免到后台报错。

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<%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt"%>
< head >
< title >Get File Size</ title >
< script  src = "http://code.jquery.com/jquery-1.11.0.min.js"
     type = "text/javascript" >
     
</ script >
< script  type = "text/javascript" >
//判断文件大小，传入id
     function GetFileSize(fileid) {
         try {
             var fileSize = 0;
             //for IE
             if ($.support.msie) {
                 //before making an object of ActiveXObject, 
                 //please make sure ActiveX is enabled in your IE browser
                 var objFSO = new ActiveXObject("Scripting.FileSystemObject");
                 var filePath = $("#" + fileid)[0].value;
                 var objFile = objFSO.getFile(filePath);
                 var fileSize = objFile.size; //size in kb
                 fileSize = fileSize / 1048576; //size in mb 
             }
             //for FF, Safari, Opeara and Others
             else {
                 fileSize = $("#" + fileid)[0].files[0].size //size in kb
                 fileSize = fileSize / 1048576; //size in mb 
             }
             alert("Uploaded File Size is" + fileSize + "MB");
         } catch (e) {
             alert("Error is :" + e);
         }
     }
</ script >
</ head >
< body >
     < form  name = "upload"  action = "" >
         < input  type = "file"  name = "fUpload"  id = "fUpload"  /> < input
             type = "button"  value = "Get File Size"  onclick = "GetFileSize('fUpload');"  />
     </ form >
</ body >