return function 示例 —— 返回的是一个函数
function a() {
console.log('aaa')
function b() {
console.log('bbb')
}
return b
};
a(); // aaa
var s = a();
console.log(s) // 整个a()函数
s(); // aaa bbb
var s = a();
console.log('111')
s(); // aaa 111 bbb
return function() 示例 —— 返回的是函数执行结果
function a() {
console.log('aaa')
function b() {
console.log('bbb')
}
return b()
};
a(); // aaa bbb
var s = a();
console.log(s) // undefined
s(); // aaa bbb s is not a function
var s = a();
console.log('111')
s(); // aaa bbb 111 s is not a function
--------------------------
function a() {
console.log('aaa')
function b() {
console.log('bbb')
return 1000
}
return b()
};
var s = a();
console.log(s) // 1000
