<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div id="div1">贱人,马蓉,点我变大!</div>
<input id="btn1" type="button" value="点我回到过去">
<script>
window.onload = function(){
var oDiv = document.getElementById('div1')
var oBtn = document.getElementById('btn1')
oDiv.onclick = function(){
oDiv.style.cssText = '200px; height:200px; border : 1px solid red'
}
oBtn.onclick = function(){
oDiv.style.cssText = ''
}
}
</script>
</body>
</html>