立即函式(IIFE)

//立即函式，函式最外面加上一个小括号，并使用()执行，()在包函式的括号内外皆可//---------------------------函式宣告(function IIFE1() {    console.log('立即函式')}());(function IIFE2(name) {    console.log('我是'+ name)})('Tom');//--------------------------函式运算式let IIFE3 = (function () {    console.log('立即函式')})();let IIFE4 = (function (name) {    console.log('我是'+ name)}('Tom'));//--------------------------匿名函式(function () {    console.log('立即函式')})();(function ( name) {    console.log('我是'+ name)}( name));

回呼函式 (Callback Function)

let doFirst = function (callback) {    console.log('do first...');    callback(); // <---执行传入的doLater()}/** callback function **/let doLater = function () {    console.log('do later...')}doFirst(doLater);

面试题目

function a(a){  a();}function b(b){  b();}function c(c){  console.log('tom')}a(b(c))

Ans:tom,a is not a function