html获取url的参数值

截取servelet的url中参数值

function getQueryString(name) {
             var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
             var r = window.location.search.substr(1).match(reg);
             if (r != null)
                 return unescape(r[2]);
             return null;
         }