<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟学堂()</title>
</head>
<body>
<p id="demo">单击按钮创建一个boolean对象，显示它的constructor属性。</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction(){
var myvar=new Boolean(1);
var x=document.getElementById("demo");
x.innerHTML=myvar.constructor;
}
</script>
</body>
</html>