<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<p>点击下面的按钮，循环遍历对象 "person" 的属性。</p>
<button onclick="myFunction()">点击这里</button>
<p id="demo"></p>
<script>
function myFunction(){
var person={fname:"哈哈",lname:"尔尔",age:12};
var x; var txt="";for (x in person){txt=txt + person[x]+" ";}document.getElementById("demo").innerHTML=txt;}</script></body></html>