如何改写成function NumTotal(){
XXXX
}XXX.onclick=NumTotal();写成这种形式下面是代码
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
div{
width: 100px;
height: 100px;
background-color: red;
}
</style>
</head>
<body>
<div id="div1"></div>
<script>
var oDiv = document.getElementById('div1');
oDiv.onclick = changeColor;
function changeColor(){
oDiv.style.backgroundColor = 'green';
}
</script>
</body>
</html>
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