url

var url = "www.baidu.com";function getKey(key){        let urls = url.split('?')[1]?url.split('?')[1]:'';    if(!urls){        console.log('没有参数');        return;    }    let arrKeys = urls.split('&');    var arr,name,value,flag;    for(var i in arrKeys){        arr = arrKeys[i].split("=");        name = arr[0];        value = arr[1];        if(key == name){            return value;        };        console.log(i,arrKeys.length-1)        if(i == arrKeys.length-1){            return "无此参数"        }    }};getKey('aa')