JS记录
2021/11/7 6:10:22
本文主要是介绍JS记录,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
1. create JS object
(1)
var myCar = new Object(); myCar.make = 'Ford'; myCar.model = 'Mustang'; myCar.year = 1969; console.log(myCar.make) // terminal 执行 node ex2.js
(2)
var myCar = { 'make' : 'Ford', 'model' : 'Mustang', 'year' : 1969 }
(3) constructors
function Car(make, model, year){ this.make = make; this.model = model; this.year = year; } var myCar = new Car('Ford', 'Mustang', 1969)
(4) class
class Car{ constructor(make, model, year){ this.make = make; this.model = model; this.year = year; } } var myCar = new Car('Ford', 'Mustang', 1969);
2. access properties
(1) mycar.make
(2) mycar['make']
3. class methods
class Car{ constructor(make, model, year){ this.make = make; this.model = model; this.year = year; } printCarDetails(){ console.log(`***${this.make}***`) } }
4. compare objects
==:casts are performed on both sides
===:no casts
5. functions
function add(firstNum,secondNum){ return firstNum + secondNum }
var addNum = function(firstNum,secNum){ return firstNum + secNum; }
arrow funtion expression, cannot be used as construntors
const addNumArror = (firstNum,secNum)=>{ return firstNum + secNum; }
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