js es6系列教程 - 新的類語法實戰(zhàn)選項卡(詳解)

class Person{
 constructor( uName ){
 this.userName = uName;
 }
 sayName(){
 return this.userName;
 }
 }

let oP = new Person( 'ghostwu' );
 console.log( oP.sayName() ); //ghostwu

 console.log( oP instanceof Person ); //true
 console.log( oP instanceof Object ); //true
 
 console.log( typeof Person ); //function
 console.log( typeof Person.prototype.sayName ); //function
 console.log( oP.__proto__ === Person.prototype ); //true
 console.log( 'sayName' in oP ); //true 
 console.log( Person.prototype );

class Operator{
 constructor( n1 = 1, n2 = 2 ){
 this.num1 = n1;
 this.num2 = n2;
 }
 add( n1 = 10, n2 = 20 ){
 let num1 = n1 || this.num1, num2 = n2 || this.num2;
 return num1 + num2;
 }
 }
 var oper = new Operator();
 console.log( oper.add( 100, 200 ) );

#tab div {
 width: 200px;
 height: 200px;
 border: 1px solid #000;
 display: none;
 }

 #tab div:nth-of-type(1) {
 display: block;
 }

 .active {
 background: yellow;
 }

<div id="tab">
 <input type="button" value="點我1" data-target="#div1" class="active">
 <input type="button" value="點我2" data-target="#div2">
 <input type="button" value="點我3" data-target="#div3">
 <input type="button" value="點我4" data-target="#div4">
 <div id="div1">1</div>
 <div id="div2">2</div>
 <div id="div3">3</div>
 <div id="div4">4</div>
 </div>

window.onload = () => {
 class Tab {
 constructor( context ) {
 let cxt = context || document;
 this.aInput = cxt.querySelectorAll( "input" );
 this.aDiv = cxt.querySelectorAll( "div" );
 }
 bindEvent(){
 let targetId = null;
 this.aInput.forEach(( ele, index )=>{
 ele.addEventListener( "click", ()=>{
 targetId = ele.dataset.target;
 this.switchTab( ele, targetId );
 });
 });
 }
 switchTab( curBtn, curId ){
 let oDiv = document.querySelector( curId );
 this.aDiv.forEach(( ele, index )=>{
 ele.style.display = 'none';
 this.aInput[index].className = '';
 });
 curBtn.className = 'active';
 oDiv.style.display = 'block';
 }
 }
 new Tab( document.querySelector( "#tab" ) ).bindEvent();
 }