<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
</head>
<body>
<label>请输入北京今天的空气质量:
<input id="input" type="text"/>
</label>
<button οnclick="show()">确认填写</button>
<div>您输入的值是：
<span id="diaplay">尚无录入</span>
</div>
<script type="text/javascript">
function show(){
var content=document.getElementById("input");
var diaplay=document.getElementById("diaplay");
diaplay.innerHTML=content.value;
}
</script>
</body>
</html>
点击按钮 可将内容返回到diaplay中
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