借用方法获取最大值

    let arr =[1,3,4,5,23];
    console.log(Math.max.call(null,...arr));

    let xj={
        lessons:{js:92,node:83,java:86},
        data:[92,83,86],
    };
    console.log(Math.max.apply(null,Object.values(xj.lessons)));
    console.log(Math.max.call(null,...xj.data));