代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script>
window.onload=function(){(window.onresize=function(){
var height=document.documentElement.clientHeight;
document.getElementById('test').style.height=height+'px';
document.getElementById('test').style.color='red';
})()
}
</script>
</head>
<body>
<div id='test' style='background:yellow'>
测试
</div>
</body>
</html>
效果：
