时钟案例

function changeTime() {
        //获取事件，创建日期对象
        var date = new Date();
        console.log(date);

        //获取时分秒
        // var ms =date.getMilliseconds();
        var sec = date.getSeconds(); //+ ms / 1000;
        var min = date.getMinutes();
        console.log (sec, min);

        var hr = date.getHours()+ min/60;
        console.log(hr);

        //动画
        second.style.transform = 'rotate(' + 6 * sec +'deg)';
        minute.style.transform ='rotate(' + 6 * min +'deg)';
        hour.style.transform = 'rotate(' + 30 * hr +'deg)';

    }
    changeTime();

    var time = setInterval(changeTime,1000);
    console.log(time);