函数也是对象

function bark() {
  console.log("Woof!");
}

bark.animal = "dog";
  • A: Nothing, this is totally fine!

  • B: SyntaxError. You cannot add properties to a function this way.

  • C: undefined

  • D: ReferenceError

这在JavaScript中是可能的,因为函数也是对象!(原始类型之外的所有东西都是对象)

函数是一种特殊类型的对象。您自己编写的代码并不是实际的函数。 该函数是具有属性的对象,此属性是可调用的。

答案: A

练习:

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 
 4 <head>
 5   <meta charset="UTF-8">
 6   <meta name="viewport" content="width=device-width, initial-scale=1.0">
 7   <meta http-equiv="X-UA-Compatible" content="ie=edge">
 8   <title></title>
 9 </head>
10 
11 <body>
12 </body>
13 
14 </html>
15 <script type="text/javascript">
16 function bark() {
17   console.log("Woof!");
18 }
19 
20 bark.animal = "dog";
21 console.log(bark.animal)
22 console.log(bark())
23 </script>
View Code

转载于:https://www.cnblogs.com/wang715100018066/p/11088971.html

猜你喜欢

转载自blog.csdn.net/weixin_34301132/article/details/94516786
今日推荐