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<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript 循环</h1>
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<p>for/in 语句循环遍历对象的属性。</p>
​
<p id="demo"></p>
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<script>
var txt = "";
var person = {fname:"Bill", lname:"Gates", age:62}; 
var x;
for (x in person) {
  txt += person[x] + " ";
}
document.getElementById("demo").innerHTML = txt;
</script>
​
</body>
</html>
​