对象

1.对象可以用来保存多个值。
2.需要多个类似对象时可以使用构造函数：

//构造函数
        function Star(uname,sex,age){
            this.uname = uname;
            this.sex = sex;
            this.age = age;
            this.sing = function(song){
                console.log(song);              
            }
        }

        var zxy = new Star('zhangxueyou','male','18');
        console.log(zxy.uname);
        zxy.sing('wenbie');

3. 遍历对象

//遍历对象
        var zxy = {
            name: 'zhangxueyou',
            sex: 'male',
            age: 18,
            sing: function(song){
                console.log(song);
                
            }
        }
        for(k in zxy){
            console.log(k);//k输出变量名
            console.log(zxy[k]);//对象[k]输出值          
        }