这个闭包中的外函数变量和外函数是什么？

Question

new to Javascript, I am going through closures and just wondering What the outer function variable and outer function is in this closure?

 function hello(name, age) { var message = name + ", who is " + age + " years old, says hi!"; return function sayhi() { console.log(message); }; } var sayHelloToJohn = hello("John", 33); sayHelloToJohn();

Answer 1

In your example, the outer function variable is message and its params name age , and the outer function is hello .

It's about their relative with the function sayHi . So sayHi can use its outer function variable, it knows message and prints it out as you can see.