代码：w3school
for/in 循环遍历对象的属性
<!DOCTYPE html>
<html>
<body>
<p>点击下面的按钮，循环遍历对象 "person" 的属性。</p>
<button οnclick="myFunction()">点击这里</button>
<p id="demo1"><br></p>
<p id="demo2"><br></p>
<script>
function myFunction()
{
var x;
var txt1="";
var txt2="";
var person={fname:"Bill",lname:"Gates",age:56};
//将person的key遍历存入x
for (x in person)
{
//x存入的是person的key，person[x]：表示key为x的值
txt1=txt1 + " " + x;
txt2=txt2 + " " + person[x];
}
document.getElementById("demo1").innerHTML=txt1;
document.getElementById("demo2").innerHTML=txt2;
}
</script>
</body>
</html>
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