javascript教程系列40:DOM中操作样式的两种方式

//html
<div id="box"></div>

//js
var box = document.getElementById(‘box‘);
box.style.width = ‘100px‘;
box.style.height = ‘100px‘;
box.style.backgroundColor = ‘red‘;

<div id="box" style="width:100px; height:100px; background-color:red">

//html
<div id="box"></div>

//css
.show{
     width:100px;
     height:100px:
     background-color:red;
}

//js
var box = document.getElementById(‘box‘);
box.className = ‘show‘;