/** 獲取url的字尾名 */
function urlRegEx(url){
    var urlRgx=/http(s)?:\/\/([\w-]+\.)+[\w-]+(\/[\w- .\/?%&=]*)?(\/\w+)*.\w{3}$/;
    if(urlRgx.test(url)){
        var urlExtName = convert(url);
    }
    return urlExtName;
}
function convert(url){
    url=url.replace(/(.*\/)*([^.]+).*/ig,"$2");
    return url;
}
 

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