我们可以写一个让小方块运动的函数：

 1  div#demo { 2  width: 100px; 3  height: 100; 4  position: absolute; 5  left: 0; 6  top: 0; 7 } 8  9 10  var div = document.getElementById(‘demo’);11  var timer = window.setInterval(function () {12  div.style.left = parseInt(getStyle(div, ‘left’)) + 1 + ‘px’;13  ifparseInt((getStyle(div, ‘left’)) > 1000) {14  clearInterval(timer);15 }16  }, 10);