正则校验URL

function IsURL (str_url) {
var strRegex = '^((https|http|ftp|rtsp|mms)?://)'
+ '?(([0-9a-z_!~*\'().&=+$%-]+: )?[0-9a-z_!~*\'().&=+$%-]+@)?' //ftp的user@
+ '(([0-9]{1,3}.){3}[0-9]{1,3}' // IP形式的URL- 199.194.52.184
+ '|' // 允许IP和DOMAIN（域名）
+ '([0-9a-z_!~*\'()-]+.)*' // 域名- www.
+ '([0-9a-z][0-9a-z-]{0,61})?[0-9a-z].' // 二级域名
+ '[a-z]{2,6})' // first level domain- .com or .museum
+ '(:[0-9]{1,4})?' // 端口- :80
+ '((/?)|' // a slash isn't required if there is no file name
+ '(/[0-9a-z_!~*\'().;?:@&=+$,%#-]+)+/?)$';
var re=new RegExp(strRegex);
if (re.test(str_url)) {
return (true);
} else {
return (false);
}
}

function checkUrl(url){
if(url!=""){
var reg=/(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?/;
if(!reg.test(url)){
alert("小可爱，网址不正确哦");
}
}
}