前言：
现在看官们对“js四”都比较关心，姐妹们都想要学习一些“js四”的相关资讯。那么小编同时在网上汇集了一些关于“js四””的相关文章，希望咱们能喜欢，你们快快来了解一下吧！一、传值还是传参
primitive-type的数据则pas-by-value，而object-type的数据则pass-by-reference。
二、Functions的种类
// 匿名函数const awesomeFunction = function(coolThings) { // .. return amazingStuff; }; // arrow function expressions var f; f = () => 42; f = x => x * 2; f = (x) => x * 2; f = (x,y) => x * y; f = x => ({ x: x * 2 }); f = x => { return x * 2; }; f = async x => { var y = await doSomethingAsync(x); return y * 2; }; someOperation( x => x * 2 ); // .. // generator function declaration function *two() { .. } // async function declaration async function three() { .. } // async generator function declaration async function *four() { .. } // named function export declaration (ES6 modules) export function five() { .. }三、Coercive Conditional Comparisonaccurate mental model
var x = "hello"; if (x) { // will run! } if (x == true) { // won't run :( }准确的accuate-model为：
var x = "hello"; if (Boolean(x) == true) { // will run } // which is the same as: if (Boolean(x) === true) { // will run }四、Prototypal Classes尝试用object构建。
var Classroom = { welcome() { console.log("Welcome, students!"); } }; var mathClass = Object.create(Classroom); mathClass.welcome(); // Welcome, students!prototypal-classes
function Classroom() { // .. } Classroom.prototype.welcome = function hello() { console.log("Welcome, students!"); }; var mathClass = new Classroom(); mathClass.welcome(); // Welcome, students!当前prototypal-class已被淘汰，取而代之以ES6's class：
class Classroom { constructor() { // .. } welcome() { console.log("Welcome, students!"); } } var mathClass = new Classroom(); mathClass.welcome(); // Welcome, students!五、总结JS是以object为基石。
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标签： #js四
