<a href="demo.html?id=1"/>

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


    var id = GetQueryString("id");//呼叫
    alert(id);//把id打印出 來
    ```

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