????：<html><head> <meta charset='utf-8'> <style> #box{ width:100px; height:100px; background:red; margin: 20px 80px; } </style></h
<html>
<head>
<meta charset='utf-8'>
<style>
#box{
width:100px; height:100px;
background:red;
margin: 20px 80px;
}
</style>
</head>
<body>
<div id="box"></div>
<input onclick="aa()" type="button" value="變高">
<input onclick="bb()" type="button" value="變寬">
<input onclick="cc()" type="button" value="變色">
<input onclick="dd()" type="button" value="重置">
<input onclick="ee()" type="button" value="顯示">
<input onclick="ff()" type="button" value="隱藏">
</body>
</html>
<script>
var box
window.onload = function(){
box = document.getElementById('box')
}
function aa(){
box.style.height = '350px'
}
function bb(){
box.style.width = '400px'
}
function cc(){
box.style.background = 'blue'
}
function dd(){
box.style.height='100'
box.style.width='100'
box.style.background='red'
}
function ee(){
box.style.display = 'block'
}
function ff(){
box.style.display = 'none'
}
</script>
?? ???：滅絕師太?? ??：2019-01-24 10:23:38
???? ??：完成的不錯(cuò)，寫出來的每一行代碼都要知道代碼的作用哦！