JS如何设置元素样式的方法示例

<div id="box"></div>
<script>
  var box = document.getElementById("box");
  box.style.width = '100px';
  box.style.height = '100px';
  box.style.backgroundColor = "#f00";
  box.style.cssText = 'width: 200px; height: 200px; border: 1px solid #f00;';
</script>