javascript tweenmax做倒计时的方法详解编程语言

        <div class="p2_wrap1_wrap1"id="scoreDisplay">30.00</div>

  var demo = { 
            score: 30 
        }, 
        scoreDisplay = document.getElementById("scoreDisplay"); 
    //创建一个tween在20秒内改变score的属性值从0到100. 
    var tween = TweenLite.to(demo, 30, { 
        score: 0, 
        onUpdate: showScore, 
        onComplete:gameOver, 
        ease: Linear.easeNone, 
    }) 
    //在tween update时通过这个function输出. 
    function showScore() { 
        scoreDisplay.innerHTML = demo.score.toFixed(2); 
    } 
    function gameOver(){ 
        alert('游戏结束'); 
    }