url截取

<!DOCTYPE html>

<html>

    <head>

        <meta charset="utf-8" />

        <title></title>

    </head>

    <body>

        <script>

            function get_url_param(name) {

                var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)"); //构造一个含有目标参数的正则表达式对象

                var r = window.location.search.substr(1).match(reg);  //匹配目标参数

                if (r != null) return unescape(r[2]); return null; //返回参数值

            }

            //比如说想得到id

            alert(get_url_param(id))

        </script>

    </body>

</html>
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