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同是天涯沦落人,相逢何必曾相识. 天生我材必有用,千金散尽还复来. 天若有情天亦老,人间正道是沧桑. 月影西斜人已去, 堤上梅花情依旧, 此情故已成追忆, 美人如玉夜留香

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限制上传文件后缀的js方法

2011-12-21 09:49:39| 分类： jscript3 | 标签： |举报 |字号大中小订阅

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function lastname(){

//获取欲上传的文件路径

var filepath = document.getElementById("file_name").value;

//为了避免转义反斜杠出问题，这里将对其进行转换

var re = /(\\+)/g;

var filename=filepath.replace(re,"#");

//对路径字符串进行剪切截取

var one=filename.split("#");

//获取数组中最后一个，即文件名

var two=one[one.length-1];

//再对文件名进行截取，以取得后缀名

var three=two.split(".");

//获取截取的最后一个字符串，即为后缀名

var last=three[three.length-1];

//添加需要判断的后缀名类型

var tp ="xls";

//返回符合条件的后缀名在字符串中的位置

var rs=tp.indexOf(last);

//如果返回的结果大于或等于0，说明包含允许上传的文件类型

if(rs>=0){

return true;

}else{

alert("您选择的上传文件不是xls文件！");

return false;

}

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