使用js原生实现年份轮播选择效果实例
用js实现一个年份轮换选择效果。废话不多说，看图：
1. html
代码如下：
<!DOCTYPE html><html lang='en'><head> <meta charset='UTF-8'> <title>Title</title> <link rel='stylesheet' href='https://www.haobala.com/bcjs/index.css' rel='external nofollow' type='text/css'/> <script type='text/javascript' src='https://www.haobala.com/bcjs/echarts.min.js'></script> <script type='text/javascript' src='https://www.haobala.com/bcjs/index.js'></script></head><body><div class='container'> <div onclick='clickBefore()' unselectable='on' onselectstart='return false;'> <span><</span> </div> <div class='wrap'> <span onclick='selected(this)'>1</span> <span onclick='selected(this)'>2</span> <span onclick='selected(this)'>3</span> <span onclick='selected(this)'>4</span> <span onclick='selected(this)'>5</span> </div> <div onclick='clickNext()' unselectable='on' onselectstart='return false;'> <span>></span> </div></div><div id='content'></div></body></html>
2.js
代码如下：
window.onload = function () { //首次渲染列表 initList(firstIndex);};let yearArr = [2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021];yearArr.reverse();//起始索引let firstIndex = 0;//选中索引,默认选中第一个let selectedIndex = 0;/** * 初始化列表 */function initList(firstIndex) { //渲染页面span列表 let spanList = document.getElementById(’wrap’).getElementsByTagName(’span’); for (let i = 0; i < spanList.length; i++) { let index = firstIndex + i; let span = spanList[i]; span.innerText = yearArr[index]; //选中样式添加和移除 if (index === selectedIndex) { span.classList.add(’active’); } else { span.classList.remove(’active’) } } //页面内容显示值 document.getElementById(’content’).innerText = ’当前选中年份：’ + yearArr[selectedIndex];}/** * 下一页 */function clickNext(div) { if (firstIndex + 5 < yearArr.length) { firstIndex = firstIndex + 1; initList(firstIndex) } arrowActive();}/** 上一页 */function clickBefore(div) { if (firstIndex > 0) { firstIndex = firstIndex - 1; initList(firstIndex) } arrowActive();}/** * 选中 */function selected(span) { let value = span.innerText; let index = yearArr.findIndex((el) => { return el + '' === value; }) selectedIndex = index !== -1 ? index : 0; initList(firstIndex);}/** * 左右箭头激活 * firstIndex = 0: 右激活 左不 * firstIndex = length-5：左激活 右不 * 其他：全激活 */function arrowActive() { let left = document.getElementById(’left’) let right = document.getElementById(’right’) left.classList.add(’arrow_active’); right.classList.add(’arrow_active’); if (firstIndex === 0) { left.classList.remove(’arrow_active’); } else if (firstIndex === yearArr.length - 5) { right.classList.remove(’arrow_active’); }}
2.css
代码如下：
body{ margin-top: 80px;}.container { display: flex; justify-content: center; align-items: center; margin: 10px;}.wrap { height: 40px; z-index: 1; color: black; display: flex; flex: 1; background: rgba(155,226,219,0.5); border-radius: 20px; margin-left: 20px; margin-right: 20px;}.wrap span { flex: 1; text-align: center; height: 40px; line-height: 40px; border-radius: 20px;}.active{ background: #1abc9c; color:#fff;}.arrow_left { left: 10px; color: green; padding: 0px 14px; border-radius: 50%; font-size: 30px; z-index: 2;}.arrow_right { right: 10px; color: green; padding: 0px 14px; border-radius: 50%; font-size: 30px; z-index: 2;}.arrow_active{ color: blue;}.content{ margin-left: 30px;}总结
每天记录一点，从小小菜鸟变小菜鸟！！！
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