获取url转义之后的后面key值

1、例如 https://editor.youkuaiyun.com/md?not_checkout=1&articleId=111070909，获取not_checkout值；
getUrlParameter（“not_checkout”）;//值1
//获取菜单url参数
function getUrlParameter(key) {
var url = window.location.search;
url = unescape(url);
var reg = new RegExp("(^|&)" + key + “=([^&]*)(&|KaTeX parse error: Expected group after '^' at position 112: …)" + key + "=([^̲&]*)(&|)”);
r = url.match(reg);
}
if(r != null){
return unescape(r[2]) || “”;
}
}