获取url请求的参数值

function getURLParameter(name) {
        return decodeURIComponent((new RegExp('[?|&]' + name + '=' + '([^&;]+?)(&|#|;|$)').exec(location.search) || [, ""])[1].replace(/\+/g, '%20')) || null;
    }

https://i.cnblogs.com/EditPosts.aspx?opt=1
调用方法：

getURLParameter('opt');

结果为1