原生js实现页面滚动动画
本文实例为大家分享了js实现页面滚动动画的具体代码,供大家参考,具体内容如下
需求:
1 页面滚动到对应板块,左侧对应的索引高亮
2 点击左侧的索引,滚动到对应的板块
代码如下,直接拷贝到html文件就可以使用
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> html, body, ul { margin: 0; padding: 0; } .section li { height: 400px; } li { list-style: none; } .indexs { width: 40px; background-color: #000000; color: #ffffff; position: fixed; left: 20px; bottom: 50px; display: none; } .indexs.active { display: block; } .indexs li { padding: 10px; text-align: center; user-select: none; } .indexs li.addcolor { background-color: red; } header { height: 1000px; background-color: purple; } footer { height: 200px; background-color: rgb(15, 218, 15); } </style> </head> <body> <header></header> <ul class="section"> <li style="background-color: palegreen;">1</li> <li style="background-color: rgb(15, 218, 15);">2</li> <li style="background-color: rgb(24, 203, 209);">3</li> <li style="background-color: rgb(167, 152, 251);">4</li> <li style="background-color: rgb(251, 152, 165);">5</li> <li style="background-color: palegreen;">6</li> <li style="background-color: rgb(15, 218, 15);">7</li> <li style="background-color: rgb(24, 203, 209);">8</li> <li style="background-color: rgb(167, 152, 251);">9</li> <li style="background-color: rgb(251, 152, 165);">10</li> </ul> <ul class="indexs"> <li>1</li> <li>2</li> <li>3</li> <li>4</li> <li>5</li> <li>6</li> <li>7</li> <li>8</li> <li>9</li> <li>10</li> </ul> <footer></footer> <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.js"></script> <script type="text/javascript"> let scrollTop = 0 let section = document.querySelector('.section') let sectionLi = document.querySelectorAll('.section li') let indexs = document.querySelector('.indexs') let indexsLi = document.querySelectorAll('.indexs li') let ofseTop = 0 let requestId = null let recordScrollTop = 0 // 页面滚动方向 let scrollDirection = null let diffX = 0 let diffY = 0 let scrollAction = {x: 'undefined', y: 'undefined'} let lastI = 0 let direction = null window.onscroll = myScroll function myScroll(e) { scrollTop = document.body.scrollTop || document.documentElement.scrollTop // 当header滚出去时出现左侧导航 if (section.offsetTop -scrollTop <= 0) { indexs.classList.add('active') } else { indexs.classList.remove('active') } // 滚到sectionLi对应的li时候 给indexs对应的li红色高亮 for (let i = 0; i < sectionLi.length; i++) { if(sectionLi[i].offsetTop - scrollTop <= 30) { for (let j = 0; j < indexsLi.length; j++) { indexsLi[j].classList.remove('addcolor') } indexsLi[i].classList.add('addcolor') } } } // 点击indexs对应的li 页面滚回到section对应的li for (let i = 0; i < indexsLi.length; i++) { indexsLi[i].addEventListener('click', function (e) { for (let j = 0; j < indexsLi.length; j++) { indexsLi[j].classList.remove('active') } // i就是被点击的那个li的索引值 indexsLi[i].classList.add('active') // 记录下被点击的li的offsetTop ofseTop = sectionLi[i].offsetTop // 第一种方法 jquery 动画 这里不用jquery 用requestAnimationFrame // $('html,body').animate({ // scrollTop: ofseTop // }, 300) // 第二种方法 requestAnimationFrame if(i - lastI > 0) { direction = 'down' } else if(i - lastI < 0){ direction = 'up' } // 更新lastI lastI = i // 记录点击li的时候 当前页面卷出去了多少 recordScrollTop = document.body.scrollTop || document.documentElement.scrollTop requestId = requestAnimationFrame(scrollAnimate) }) } function scrollAnimate(){ // 滚动条向下滚动 页面向上翻 当前页面卷出去更多 if (direction && direction === 'down') { recordScrollTop += 30 if (recordScrollTop >= ofseTop) { direction = null return cancelAnimationFrame(requestId) } } // 滚动条向上滚动 页面向下翻 当前页面卷出去更少 if (direction && direction === 'up') { recordScrollTop -= 30 if (recordScrollTop <= ofseTop) { direction = null return cancelAnimationFrame(requestId) } } document.body.scrollTop = recordScrollTop document.documentElement.scrollTop = recordScrollTop requestId = requestAnimationFrame(scrollAnimate) } // 人为鼠标滚动判断页面滚动方向 这个函数在这个案例用不到 function scrollFunc() { if (typeof scrollAction.x == 'undefined') { scrollAction.x = window.pageXOffset scrollAction.y = window.pageYOffset } diffX = scrollAction.x - window.pageXOffset diffY = scrollAction.y - window.pageYOffset if (diffX < 0) { // Scroll right scrollDirection = 'right' } else if (diffX > 0) { // Scroll left scrollDirection = 'left' } else if (diffY < 0) { // Scroll down scrollDirection = 'down' } else if (diffY > 0) { // Scroll up scrollDirection = 'up' } scrollAction.x = window.pageXOffset scrollAction.y = window.pageYOffset } </script> </body> </html>
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