JavaScript中通过for…in语句遍历对象，JS中我们可以通过for..in语句输出对象的每一个元素和元素值
<!DOCTYPE html>
<html>
<body>
<p>75271.com Click the button to loop through the properties of an object named "person".</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction()
{
var x;
var txt="";
var person={fname:"John",lname:"Doe",age:25};
for (x in person)
{
txt=txt + person[x];
}
document.getElementById("demo").innerHTML=txt;
}
</script>
</body>
</html>
上面的代码输出
JohnDoe25
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