<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="css/css1.css">
</head>
<body>
<button id="btn">按钮</button>
<div id="box"> </div>
<input type="button" value="提交">
<script>
var btn=document.getElementById('btn');
var box=document.querySelector('#box');
btn.onclick=function (ev) {
this.style.background ='green';
box.style.background='red';
box.style.width='400px';
box.style.height='400px';
box.style.border='5px,solid,#000';
this.style.color='white';
}
var input=document.querySelector('input');
input.onclick=function (ev) {
this.value='提交成功';
}
</script>
</body>
</html>