js的运用

/********接收地址栏参数**********/function GetQuery(key) {    var search = location.search.slice(1); //得到get方式提交的查询字符串    var arr = search.split("&");    for (var i = 0; i < arr.length; i++) {        var ar = arr[i].split("=");        if (ar[0] == key) {            if (unescape(ar[1]) == 'undefined') {                return "";            } else {                return unescape(ar[1]);            }        }    }    return "";}