js获取地址栏参数

假如html地址栏为: http://www.baidu.com?abc=123

 function getUrlPara(paraName){
     var sUrl  =  window.location;
     var sReg  =  "(?:\\?|&){1}"+paraName+"=([^&]*)"
     var re=new RegExp(sReg,"gi");
     re.exec(sUrl);
     return RegExp.$1;
    }

用法：

alert( getUrlPara("abc"));