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CSS描边动画，后端直呼哇塞
發布時間：2024/1/18
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CSS描边动画，后端直呼哇塞
小編覺得挺不錯的,現在分享給大家,幫大家做個參考.
你們好啊，我來分享代碼了，先看看效果， 🤪
效果展示
我發現在 css 的世界里，至少在目前看來，想要實現一些不規則的運動曲線是很為難的，因此，今天給大家分享一個借助 SVG 快速實現描邊動畫的技巧，這里主要分享兩種，第一種使用自己繪制SVG文字，第二種使用現成的 SVG 來實現動畫，快來學習吧
1.繪制 SVG，實現文字描邊動畫
國內的 Pixso 設計軟件
設計完成之后，在菜單欄中選擇復制，然后復制為 SVG
代碼實現
介紹關于 SVG 的屬性
fill=“none” 背景填充顏色
stroke=“white” 描邊的顏色
stroke-width=“3” 描邊粗細
關于 SVG 的 CSS 動畫屬性
stroke-dasharray:用于創建虛線，之所以后面跟的是array的，是因為值是數組
stroke-dasharray = ‘10’ 表示：虛線長10，間距10，然后重復 虛線長10，間距10
stroke-dasharray = ‘10, 5’ 表示：虛線長10，間距5，然后重復 虛線長10，間距5
stroke-dasharray = ‘20, 10, 5’ 表示：虛線長20，間距10，虛線長5，接著是間距20，虛線10，間距5，之后開始如此循環
stroke-dashoffset： offset：偏移的意思
這個屬性是相對于起始點的偏移，正數偏移x值的時候，相當于往左移動了x個長度單位，負數偏移x的時候，相當于往右移動了x個長度單位。
需要注意的是，不管偏移的方向是哪邊，要記得dasharray 是循環的，也就是 虛線-間隔-虛線-間隔。
這個屬性要搭配stroke-dashoffset才能看得出來效果，非虛線的話，是無法看出偏移的。
想要實現描邊動畫，就得知道 SVG path 屬性的周長，可以借助JavaScript，代碼如下，先獲取所有的 path 節點，然后for循環打印出每一個的長度，通過 getTotalLength() 方法
<script>const logo = document.querySelectorAll('.logo path');for (let i = 0; i < logo.length; i++) {console.log(`第${i}個字長度是：${logo[i].getTotalLength()}`);} </script>
如上，成功獲取到，然后我們需要設置 stroke-dasharray 為它的周長，你會發現并沒有什么變化，因為他就是周長，當你設置的比周長小時就會發生變化了，你可能會問，沒變化設置它干嘛，問得好，它是我們使用第二個屬性所必備的，接下來，使用 stroke-dashoffset 設置偏移量也和周長相等，這時你會發現，節點消失了，nice
最后，就通過動畫，再把偏移量重置為0，這時你就會發現神奇的事情發生了，嘿嘿，快去試試吧
SVG文字描邊動畫完整代碼
<!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>SVG描邊</title><style>* {margin: 0;padding: 0;box-sizing: border-box;}body {display: flex;align-items: center;justify-content: center;min-height: 100vh;background-color: #333;}.logo path:nth-child(1) {stroke-dasharray: 207;stroke-dashoffset: 207;animation: line 3s ease forwards;}.logo path:nth-child(2) {stroke-dasharray: 144;stroke-dashoffset: 144;animation: line 3s ease forwards 100ms;}.logo path:nth-child(3) {stroke-dasharray: 215;stroke-dashoffset: 215;animation: line 3s ease forwards 300ms;}.logo path:nth-child(4) {stroke-dasharray: 214;stroke-dashoffset: 214;animation: line 4s ease infinite forwards 500ms;}.logo path:nth-child(5) {stroke-dasharray: 208;stroke-dashoffset: 208;animation: line 3s ease forwards 700ms;}.logo path:nth-child(6) {stroke-dasharray: 247;stroke-dashoffset: 247;animation: line 3s ease forwards 900ms;}.logo path:nth-child(7) {stroke-dasharray: 216;stroke-dashoffset: 216;animation: line 4s ease forwards 1200ms;}.logo path:nth-child(8) {stroke-dasharray: 217;stroke-dashoffset: 217;animation: line 5s ease forwards 1400ms;}.logo path:nth-child(9) {stroke-dasharray: 290;stroke-dashoffset: 290;animation: line 6s ease infinite forwards 1600ms;}.logo{animation: fill 2s ease forwards 2500ms;}@keyframes line{to{stroke-dashoffset: 0;}}@keyframes fill{from{fill:transparent;}to{fill:rgba(14, 183, 255, 0.776);}}</style> </head><body><svg class="logo" width="712" height="712" viewBox="0 0 512 95" fill="none" xmlns="http://www.w3.org/2000/svg"><pathd="M33.4285 52.664C34.1325 53.56 35.0925 54.712 36.3085 56.12C37.5885 57.464 38.7725 58.904 39.8605 60.44C41.0125 61.912 41.9405 63.384 42.6445 64.856C43.3485 66.328 43.5405 67.608 43.2205 68.696C42.7085 70.36 41.7485 71.32 40.3405 71.576C38.9325 71.832 37.4605 71.576 35.9245 70.808C34.8365 70.296 33.5885 69.4 32.1805 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60.824Z"stroke="white" stroke-width="3" /></svg><script>const logo = document.querySelectorAll('.logo path');for (let i = 0; i < logo.length; i++) {console.log(`第${i}個字長度是：${logo[i].getTotalLength()}`);}</script> </body></html>使用現成SVG制作描邊動畫
這里推薦的是阿里媽媽的 iconfont
原理大差不差，剩下的就是自己發揮了，我就直接放上代碼了
<!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-sizing: border-box;}body {display: flex;align-items: center;justify-content: center;min-height: 100vh;}svg path:nth-child(1) {stroke-dasharray: 4377;stroke-dashoffset: 4377;animation: line 3s ease forwards;}svg {animation: rota .8s linear infinite 3s,fill 2s ease forwards 100ms;}@keyframes line {to {stroke-dashoffset: 0;}}@keyframes fill {from {fill: transparent;}to {fill: rgb(0, 147, 52);}}@keyframes rota{from{transform: rotate(0deg);}to{transform: rotate(360deg);}}</style> </head><body><svg t="1649057793063" class="icon" viewBox="0 0 1063 1024" version="1.1" xmlns="http://www.w3.org/2000/svg"p-id="874" width="500" height="500" stroke="rgb(0, 147, 52)"stroke-width="14" fill="transparent"><pathd="M529.947518 540.724528c-200.816196 0-303.386296-121.055118-303.386297-270.381264S321.909314 0 529.947518 0z m-61.612061 45.110044c100.400098 173.89217 46.775046 323.256316-82.49308 397.928389S103.972102 1036.411012 0 856.234836z m73.437072 24.566024c100.399098-174.00017 256.517251-202.200197 385.841377-127.528124s186.540182 217.786213 82.49308 397.909388z"p-id="875"></path></svg><script>const logo = document.querySelectorAll('svg path');for (let i = 0; i < logo.length; i++) {console.log(`第${i}個字長度是：${logo[i].getTotalLength()}`);}</script> </body> </html>這就是全部內容了，你 GET 到了嗎，拜拜了你
總結
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