js获取地址栏的参数

 //获取url参数

    window.getParam = function(url, id) {

      url = url+ "";

      var regstr = "/(\\?|\\&)" + id + "=([^\\&]+)/";

      var reg = eval(regstr);

      var result = url.match(reg);

      if (result && result[2]) {

        return result[2];

      }else{

        return ''

      }

    }