将字符串转换成对象，重要

// http://www.baidu.com?username=xiaowang&password=12345&age=18&sex=女&score=90
            // {username:"xiaowang",password:12345,age:18,sex:"女",score:90}
        
            var url = "http://www.baidu.com?username=xiaowang&password=12345&age=18&sex=女&score=90";
            var obj = {};
            var strArr = url.split("?");
            // console.log(strArr[1]);//username=xiaowang&password=12345&age=18&sex=女&score=90
            var strArr2 = strArr[1].split("&");
            // console.log(strArr2);//["username=xiaowang", "password=12345", "age=18", "sex=女", "score=90"]
            for (var i = 0; i < strArr2.length; i++) {
                // strArr2[i].split("=")//["username","xiaowang"]
                obj[strArr2[i].split("=")[0]] = strArr2[i].split("=")[1];
            }
            console.log(obj);//{username: "xiaowang", password: "12345", age: "18", sex: "女", score: "90"}
        
        
        
            // var str = 'username=xiaowang&password=12345&age=18&sex=女&score=90'
            function queryString(str) {
                var obj = {};
                var strArr2 = str.split("&");
                for (var i = 0; i < strArr2.length; i++) {
                    obj [ strArr2[i].split("=")[0] ] = strArr2[i].split("=")[1];
                }
                return obj;
            }