​x
 
<!DOCTYPE html>
<html>
<body>
​
<p>如果指定对象属于指定对象的实例，则 instanceof 运算符返回 true。</p>
​
<p id="demo"></p>
​
<script>
var cars = ["Audi", "Volvo", "BMW"];
​
document.getElementById("demo").innerHTML =
  (cars instanceof Array) + "<br>" + 
  (cars instanceof Object) + "<br>" +
  (cars instanceof String) + "<br>" +
  (cars instanceof Number);
</script>
​
</body>
</html>
​