JS实现Tab栏切换的两种方式案例详解
面向过程的写法
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> *{ padding: 0; margin: 0; } div{ width: 500px; border: 1px solid red; } ul{ overflow: hidden; } ul>li{ list-style: none; float: left; width: 50px; text-align: center; } div>div{ height: 300px; background-color: pink; text-align: center; font-size: 50px; } #lastBox{ display: none; } .selected{ background-color: orange; } </style> </head> <body> <div> <ul> <li id="first" class="selected">1</li> <li id="last">2</li> </ul> <div id="firstBox">11111</div> <div id="lastBox">222222</div> </div> <script> var lis = document.querySelectorAll('ul>li') var content = document.querySelectorAll('div>div') //藏值 通过属性来保存对应的值 通过对应的对象来藏 //加所有li添加点击事件 for(var i=0;i<lis.length;i++){ // lis[i].setAttribute('data-index',i) lis[i].index = i lis[i].onclick = function(){ //排他思想 先将所有的全部设置一个值 然后再给自己设置一个值 for(var j=0;j<lis.length;j++){ lis[j].className = "" } this.className = "selected" //排他 //先将其他的都隐藏 再给自己显示 for(var j=0;j<content.length;j++){ content[j].style.display = "none" } // document.getElementById(this.id+'Box').style.display = 'block' // content[this.getAttribute('data-index')].style.display = 'block' content[this.index].style.display = 'block' } } </script> </body> </html>
面向对象的写法
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> *{ margin: 0; padding: 0; } #box{ width: 400px; height: 400px; border: 2px solid pink; margin: 0 auto; } ul{ display: flex; margin: 0 auto; width: 400px; position: relative; } ul>li{ list-style: none; width: 100px; height: 50px; font-size: 40px; text-align: center; border: 1px solid white; background-color: yellow; } ul .showli{ background-color: orange; } #box div{ width: 400px; height: 350px; position: absolute; display: none; } #box .show{ display: block; background-color: rgb(0, 183, 255); font-size: 80px; text-align: center; } </style> </head> <body> <div id="box"> <ul> <li class="showli">1</li> <li>2</li> <li>3</li> <li>4</li> </ul> <div class="show">1</div> <div>2</div> <div>3</div> <div>4</div> </div> <script> //用面向对象的思维写tab栏切换 //属性:选项框,选项框对应要切换的页面 class Tab{ constructor(ele){ this.box = document.getElementById(ele); this.lis = this.box.querySelectorAll('ul > li'); this.divs = this.box.querySelectorAll('div'); } change() { // console.log(this.box); // console.log(this.lis); // console.log(this.divs); for(var i = 0; i < this.lis.length; i++) { //保存当前this指向 var _this = this; //保存每一个li的下标,便于切换指定div this.lis[i].index = i; //每一个li添加点击事件 this.lis[i].onclick = function() { //排他,清空所有li与盒子的类名 for(var j = 0; j < _this.lis.length; j++) { _this.lis[j].className = ""; _this.divs[j].className = ""; } //单独设置点击的li类名,让其样式和其余未被点击的li不同 this.className = "showli"; //检查当前li的下标是否成功保存 // console.log(this.index); //让li对应的div显示出来 _this.divs[this.index].className = "show"; } } } } var tab = new Tab("box"); tab.change(); </script> </body> </html>
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