先看效果：
再看代码：
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>加载动画按钮</title><script src="https://cdnjs.cloudflare.com/ajax/libs/animejs/3.2.1/anime.min.js"></script><style>* {box-sizing: border-box;}body {width: 100%;height: 100vh;background-color: #000000;font-family: "Plus Jakarta Sans", sans-serif;}body main {display: flex;justify-content: center;align-items: center;width: inherit;height: inherit;}body main .btn-area {position: relative;width: calc(210px + 2px);height: calc(60px + 2px);}body main .btn-area:hover .main-btn {opacity: 0.25;}body main .btn-area .main-btn {width: inherit;height: inherit;opacity: 0.15;transition: 250ms;}body main .btn-area .main-btn rect {width: 210px;height: 60px;transition: 250ms;}body main .btn-area .progress-area,body main .btn-area .complete-area {position: absolute;display: flex;justify-content: space-evenly;align-items: center;top: 50%;left: 50%;transform: translate(-50%, -50%);width: 100%;color: #1578ff;user-select: none;opacity: 1;}body main .btn-area .progress-area .area-left,body main .btn-area .complete-area .area-left {display: flex;}body main .btn-area .progress-area .area-left svg,body main .btn-area .complete-area .area-left svg {margin-right: 1rem;opacity: 0;}body main .btn-area .progress-area .area-left span,body main .btn-area .complete-area .area-left span {width: 50px;text-align: right;}body main .btn-area .progress-area .area-right,body main .btn-area .complete-area .area-right {position: relative;display: flex;align-items: center;height: 20px;margin-right: -1rem;padding-left: 1rem;border-left: 1px solid #1578ff44;overflow: hidden;cursor: pointer;}body main .btn-area .progress-area .area-right:hover,body main .btn-area .complete-area .area-right:hover {height: 40px;transition: 250ms height;}body main .btn-area .progress-area .area-right:hover svg,body main .btn-area .complete-area .area-right:hover svg {opacity: 1;}body main .btn-area .progress-area .area-right svg,body main .btn-area .complete-area .area-right svg {opacity: 0.5;transition: 250ms;}body main .btn-area .progress-area .area-right .btn-play,body main .btn-area .complete-area .area-right .btn-play {position: absolute;transform: translateY(40px);}body main .btn-area .complete-area {justify-content: space-around;display: none;}body main .btn-area .complete-area svg {width: 40px;height: 20px;margin-right: 1rem;padding-right: 1rem;border-right: 1px solid #fff6;}body main .btn-area .complete-area svg path {stroke-linecap: round;stroke-linejoin: round;stroke-width: 6px;opacity: 0;}body main .btn-area .complete-area span {color: #fffd;padding-bottom: 1px;opacity: 0;}body main .btn-area .frame-btn {position: absolute;top: 0;left: 0;width: inherit;height: inherit;}body main .btn-area .frame-btn rect {width: 210px;height: 60px;stroke-linecap: round;stroke-linejoin: round;}body .instagram-link {position: absolute;right: 50px;bottom: 50px;}body .instagram-link i {color: #1578ff;transition: 150ms;font-size: 2rem;opacity: 0.5;}body .instagram-link i:hover {opacity: 1;}</style>
</head>
<body>
<main><div class="btn-area"><svg class="main-btn" xmlns="http://www.w3.org/2000/svg" version="1.1"><rect fill="#fff" stroke="#1578ff" stroke-width="2" x="1" y="1" rx="10" ry="10" /></svg><svg class="frame-btn" xmlns="http://www.w3.org/2000/svg" version="1.1"><rect fill="none" stroke="#1578ff" stroke-width="2" stroke-dasharray="525" stroke-dashoffset="525" x="1" y="1" rx="10" ry="10" /></svg><div class="progress-area"><div class="area-left"><svg width="18" height="18" viewBox="0 0 36 36" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M18 3C17.1 3 16.5 3.6 16.5 4.5V8.25C16.5 9.15 17.1 9.75 18 9.75C18.9 9.75 19.5 9.15 19.5 8.25V4.5C19.5 3.6 18.9 3 18 3Z" fill="#1578ff" /><path d="M10.0504 12.1504C10.3504 12.4504 10.8004 12.6004 11.1004 12.6004C11.4004 12.6004 11.8504 12.4504 12.1504 12.1504C12.7504 11.5504 12.7504 10.6504 12.1504 10.0504L9.45039 7.35039C8.85039 6.75039 7.95039 6.75039 7.35039 7.35039C6.75039 7.95039 6.75039 8.85039 7.35039 9.45039L10.0504 12.1504Z" fill="#1578ff" /><path d="M9.75 18C9.75 17.1 9.15 16.5 8.25 16.5H4.5C3.6 16.5 3 17.1 3 18C3 18.9 3.6 19.5 4.5 19.5H8.25C9 19.5 9.75 18.9 9.75 18Z" fill="#1578ff" /><path d="M10.0508 23.8504L7.50078 26.4004C6.90078 27.0004 6.90078 27.9004 7.50078 28.5004C7.80078 28.8004 8.25078 28.9504 8.55078 28.9504C8.85078 28.9504 9.30078 28.8004 9.60078 28.5004L12.1508 25.9504C12.7508 25.3504 12.7508 24.4504 12.1508 23.8504C11.5508 23.2504 10.6508 23.2504 10.0508 23.8504Z" fill="#1578ff" /><path d="M18 26.25C17.1 26.25 16.5 26.85 16.5 27.75V31.5C16.5 32.4 17.1 33 18 33C18.9 33 19.5 32.4 19.5 31.5V27.75C19.5 27 18.9 26.25 18 26.25Z" fill="#1578ff" /><path d="M25.9504 23.8504C25.3504 23.2504 24.4504 23.2504 23.8504 23.8504C23.2504 24.4504 23.2504 25.3504 23.8504 25.9504L26.4004 28.5004C26.7004 28.8004 27.1504 28.9504 27.4504 28.9504C27.7504 28.9504 28.2004 28.8004 28.5004 28.5004C29.1004 27.9004 29.1004 27.0004 28.5004 26.4004L25.9504 23.8504Z" fill="#1578ff" /><path d="M31.5 16.5H27.75C26.85 16.5 26.25 17.1 26.25 18C26.25 18.9 26.85 19.5 27.75 19.5H31.5C32.4 19.5 33 18.9 33 18C33 17.1 32.4 16.5 31.5 16.5Z" fill="#1578ff" /><path d="M24.9004 12.5998C25.3504 12.5998 25.6504 12.4498 25.9504 12.1498L28.5004 9.5998C29.1004 8.9998 29.1004 8.0998 28.5004 7.4998C27.9004 6.8998 27.0004 6.8998 26.4004 7.4998L23.8504 10.0498C23.2504 10.6498 23.2504 11.5498 23.8504 12.1498C24.1504 12.4498 24.6004 12.5998 24.9004 12.5998Z" fill="#1578ff" /></svg><span>0 %</span></div><div class="area-right"><svg width="18" height="18" viewBox="0 0 36 36" fill="none" xmlns="http://www.w3.org/2000/svg" class="btn-pause"><path fill-rule="evenodd" clip-rule="evenodd" d="M8.25 6C6.97843 6 6 6.97843 6 8.25V27.75C6 29.0216 6.97843 30 8.25 30H10.65C11.7358 30 12.7805 29.0469 12.9 27.8353V8.25C12.9 6.97843 11.9216 6 10.65 6H8.25ZM3 8.25C3 5.32157 5.32157 3 8.25 3H10.65C13.5784 3 15.9 5.32157 15.9 8.25V27.9C15.9 27.9384 15.8985 27.9768 15.8956 28.015C15.6906 30.6796 13.4492 33 10.65 33H8.25C5.32157 33 3 30.6784 3 27.75V8.25Z" fill="#ff542b" /><path fill-rule="evenodd" clip-rule="evenodd" d="M25.3496 6C24.078 6 23.0996 6.97843 23.0996 8.25V27.75C23.0996 29.0216 24.078 30 25.3496 30H27.7496C29.0613 30 29.9996 28.982 29.9996 27.9V8.25C29.9996 6.97843 29.0212 6 27.7496 6H25.3496ZM20.0996 8.25C20.0996 5.32157 22.4212 3 25.3496 3H27.7496C30.678 3 32.9996 5.32157 32.9996 8.25V27.9C32.9996 30.718 30.6379 33 27.7496 33H25.3496C22.4212 33 20.0996 30.6784 20.0996 27.75V8.25Z" fill="#ff542b" /></svg><svg width="18" height="18" viewBox="0 0 36 36" fill="none" xmlns="http://www.w3.org/2000/svg" class="btn-play"><path fill-rule="evenodd" clip-rule="evenodd" d="M3 7.33761C3 2.58639 8.08368 0.177285 12.0217 2.27008C12.0446 2.28222 12.0671 2.29495 12.0893 2.30826L30.0453 13.0771C33.9849 15.2998 33.9849 20.6354 30.0453 22.8581L12.0893 33.627L12.0701 33.6383C8.06754 35.9588 3 33.3067 3 28.7474V7.33761ZM10.5822 4.90258C8.33198 3.73209 6 5.21176 6 7.33761V28.7474C6 30.7729 8.36369 32.3115 10.5566 31.048L28.5205 20.2745C28.5334 20.2667 28.5465 20.2591 28.5597 20.2518C30.4801 19.1775 30.4801 16.7578 28.5597 15.6835C28.5521 15.6792 28.5445 15.6749 28.537 15.6705C28.5315 15.6673 28.526 15.6641 28.5205 15.6608L10.5822 4.90258Z" fill="#1578ff" /></svg></div></div><div class="complete-area"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 52.71 28.57"><path class="tick-1" fill="none" stroke="#ffff" stroke-dasharray="52" stroke-dashoffset="52" d="M2,12.42,16.14,26.57,34.71,2" /><path class="tick-2" fill="none" stroke="#fff8" stroke-dasharray="52" stroke-dashoffset="52" d="M18,12.42,32.14,26.57,50.71,2" /></svg><span>完毕</span></div></div>
</main></body>
<script>const buttonArea = document.querySelector('.btn-area')const progressArea = document.querySelector('.progress-area')const completeArea = document.querySelector('.complete-area')const mainBtn = document.querySelector('.main-btn rect')const frameBtn = document.querySelector('.frame-btn rect')const loadingIcon = document.querySelector('.progress-area .area-left svg')const loadingProgress = document.querySelector('.progress-area .area-left span')const loadingBtn = document.querySelector('.progress-area .area-right')const pauseBtn = document.querySelector('.progress-area .area-right .btn-pause')const playBtn = document.querySelector('.progress-area .area-right .btn-play')const tick1 = document.querySelector('.complete-area .tick-1')const tick2 = document.querySelector('.complete-area .tick-2')const doneText = document.querySelector('.complete-area span')let loadingTime = 5500let progress = {value: '0 %'}let loadingStatus = truedocument.body.onload = function() {anime({targets: loadingIcon,opacity: [0, 1],duration: 750,easing: 'easeOutQuad'})let aniLoadingIcon = anime({targets: loadingIcon,rotateZ: 360,duration: 2000,loop: true,easing: 'linear'})anime({targets: loadingProgress,translateY: ['15px', '0'],opacity: [0, 1],delay: 250,duration: 750,easing: 'easeOutQuart'})anime({targets: loadingBtn,translateY: ['15px', '0'],opacity: [0, 1],delay: 350,duration: 1000,easing: 'easeOutQuart'})let aniProgress = anime({targets: progress,value: '100 %',duration: loadingTime,easing: 'cubicBezier(.5, .05, .3, .9)',delay: 1000,round: 1,update: function() {loadingProgress.innerHTML = JSON.stringify(progress.value).replace(/^"(.*)"$/, '$1')}})let aniFrameBtn = anime({targets: frameBtn,strokeDashoffset: [525, 0],duration: loadingTime,easing: 'cubicBezier(.5, .05, .3, .9)',delay: 1000,complete: function() {completeLoading()}})loadingBtn.addEventListener('click', () => {if (loadingStatus) {aniLoadingIcon.pause()aniProgress.pause()aniFrameBtn.pause()pauseBtn.style.transform = 'translateY(-40px)'playBtn.style.transform = 'translateY(0px)'loadingStatus = false} else {aniLoadingIcon.play()aniProgress.play()aniFrameBtn.play()pauseBtn.style.transform = 'translateY(0px)'playBtn.style.transform = 'translateY(40px)'loadingStatus = true}})}function completeLoading() {anime({targets: loadingIcon,translateX: [0, -20],opacity: [1, 0],duration: 500,delay: 0,easing: 'easeInQuad'})anime({targets: loadingProgress,translateY: [0, -20],opacity: [1, 0],duration: 500,delay: 250,easing: 'easeInQuad'})anime({targets: loadingBtn,translateY: [0, -20],opacity: [1, 0],duration: 500,delay: 500,easing: 'easeInQuad',complete: function() {progressArea.style.display = 'none'completeArea.style.display = 'flex'}})anime({targets: frameBtn,fill: ['#f5f9fe', '#1578ff'],duration: 500,delay: 750,easing: 'easeInQuad'})anime({targets: tick1,strokeDashoffset: [52, 0],opacity: [0, 1],duration: 500,easing: 'cubicBezier(.5, .05, .3, .9)',delay: 1000})anime({targets: tick2,strokeDashoffset: [52, 0],opacity: [0, 1],duration: 500,easing: 'cubicBezier(.5, .05, .3, .9)',delay: 1250})anime({targets: doneText,opacity: [0, 1],translateY: ['25', '0'],duration: 1000,easing: 'easeOutQuad',delay: 1250})}
</script>
</html>
