<html>
<head>
</head>
<style>
#div1{width:400px;height:400px;background-color:red;}
</style>
<script>
function blue(){
div1=document.getElementById('div1');
div1.style.backgroundColor='blue';
}
function pink(){
div1=document.getElementById('div1');
div1.style.backgroundColor='pink';
}
function black(){
div1=document.getElementById('div1');
div1.style.backgroundColor='black';
}
</script>
<body>
<button onclick='wr();'>生成文字</button>
<button onclick='blue();'>blue</button>
<button onclick='pink();'>pink</button>
<button onclick='black();'>black</button>
<div id='div1'>
</div>