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节日礼物待签收,开箱国庆头像

🎁 点击这里 获取国庆头像。通过 Vue3 + Vant(组件库) + Vite 构建。

应用的流程

在做之前,先思考它的流程:

  1. 上传头像
  2. 选择头像模板
  3. 保存新头像

进入应用放出节日祝福与简单的使用介绍。

节日礼物待签收,开箱国庆头像

开始仅显示一个上传头像按钮。这样做的好处是,直接固定第一步操作。如果将模板和保存按钮显示出来需要增加代码做一些判断。如果开始就将头像模板与保存按钮显示,可能让人无从下手。

节日礼物待签收,开箱国庆头像

上传头像后直接将模板与保存按钮显示出来。在代码中默认选中今年最流行的模板,直接点击保存按钮将下载这个头像。开屏也进行了选择模板的提示,如果点击一个头像模板,将进行切换,通过点击保存按钮保存它。

节日礼物待签收,开箱国庆头像

最后,点击保存显示烟花动画。

节日礼物待签收,开箱国庆头像

代码实现

头像上传

<div   class="uploader-wrap"   :style="{ marginTop: fileList.length === 0 ? '220px' : '80px' }" >   <Uploader     v-model="fileList"     preview-size="120px"     class="uploader"     :deletable="true"     :max-count="1"     :after-read="afterRead"     :before-delete="handleDelete"   /> </div> 

开始,仅显示一个上传按钮,但希望它出现在屏幕靠中间位置,便于点击。通过 vue 样式绑定即可。

.uploader-wrap {   display: flex;   justify-content: center;   transition: 0.3s margin; } 

在样式代码中给它添加 transition(过渡效果)。

const fileList = ref([]) const base64 = ref('')  const afterRead = file => buildBase64(file.file)  const buildBase64 = file => {   const reader = new FileReader()   reader.readAsDataURL(file)   reader.onload = () => {     base64.value = reader.result   } }  const handleDelete = () => {   base64.value = ''   fileList.value = [] } 

在 JS 中,通过 afterRead 获取上传的文件,并将它转化为 Base64 编码,以便在后面将它在头像模板中再次显示。通过 handleDelete 将 响应属性 base64 与 fileList 的值清空。由于上传按钮位置通过 vue 样式绑定,当 fileList 为空时,上传按钮会再次回到屏幕靠中间位置。

模板列表

<div class="preview-list">   <div     class="preview-item"     v-if="fileList.length !== 0"     v-for="(num, index) in 6"     :id="`item-${num}`"     :key="index"     @click="handleSelect"   >     <img       class="preview-item__img"       :src="base64"       alt="avatar"       v-show="base64 !== ''"     />     <img       class="preview-item__modification"       :src="getImageUrl(num)"       alt="avatar"     />   </div> </div> 

通过 v-if 控制列表显示。给每个列表项一个唯一的 id,以便区分它们。

.preview-list {   display: grid;   grid-template-rows: repeat(2, 1fr);   grid-template-columns: repeat(3, 1fr);   row-gap: 14px;   column-gap: 8px;   margin: 40px 0 60px;    .preview-item {     justify-self: center;     // ...     img {       display: block;       position: absolute;       top: 0;       right: 0;       bottom: 0;       left: 0;       width: 100%;       height: 100%;     }   } }  

在样式中,直接通过 grid 生成一个两行三列的布局。由于给图片的设定宽度小于网格宽度,通过 justify-self: center 使每个项水平居中。通过定位将两个 img 重叠显示。如果使用两个 div,并分别给它们添加背景图片(Base64)配合 Vue3 CSS 样式变量注入将非常香,但生成 canvas 后将变得模糊。

const getImageUrl = name => new URL(`./assets/${name}.png`, import.meta.url).href const selectedId = ref('item-1')  const handleSelect = e => {   selectedId.value = e.currentTarget.id   Toast.success('选择成功') } 

在 JS 中,由于 vue 无法在动态绑定 src 至本地文件,在 webpack 中使用 require 动态引入文件即可。 在 vite 中,通过 vite 特有的 import.meta.url 来获取。原因是,可以通过动态绑定到 “/src/assets/ ${name}.png” 来显示出头像模板,但这在生产环境中无法被加载(资产被打包到 dist 或其他目录下,assets 不在 src 下了)。如果是 src 静态的,直接通过绑定 “./assets/${name}.png” 即可, 开发环境输出到浏览器时,被编译为 “/src/assets/name.png”,在生产环境也能被正确显示,另外也可以通过将静态头像模板图片放到根目录下的 public 来解决,在 vite build 时,public 会被复制到输出文件夹(ourDir)下。

保存头像

<Button   v-if="fileList.length !== 0"   :loading="downloading"   @click="handleSave"   type="primary"   loading-text="保存中..."   block   color="#FA9935"   >保存</Button > 

template 中,使用 vant 组件库加载按钮,通过点击触发 handleSave 函数保存头像。

const downloading = ref(false)  const handleSave = () => {   if (fileList.value.length === 0) {     Toast.fail('请先上传头像')     return   }    downloading.value = true    html2canvas(document.querySelector(`#${selectedId.value}`), {     scale: 4,     allowTaint: true,     dpi: window.devicePixelRatio * 2,   }).then(canvas => {     // downloadjs(canvas.toDataURL(), '头像.png', 'image/png')     saveAs(canvas.toDataURL(), 'image.jpg')      // const dataUrl = canvas.toDataURL()     // const a = document.createElement('a')     // a.download = 'avatar.png'     // a.href = dataUrl     // a.click()      downloading.value = false     Toast.success('保存成功')      showFireworks.value = true     setTimeout(() => {       showFireworks.value = false     }, 3000)   }) } 

handleSave 函数中,开始将 downloading 的值更新为 true,按钮这时为 loading 状态。通过 html2canvas.js 将选中的头像模板转为 canvas,在结果中通过 canvas.toDataURL() 获取 canvas dataUrl,在通过 file-saver 将头像保存。通过 HTML a[download] 与 download.js 都不能很好的处理移动端兼容问题。最后,就是显示烟花彩蛋了,在烟花动画播放完毕再将它关闭。

烟花效果与开屏提示

以上就是主要代码了,下面分别是烟花效果与开屏提示组件的代码片段,如果你对它们感兴趣可以通过点击展开查看它们。

Blessing.vue
<script setup> import { ref } from 'vue' const show = ref(true) </script>  <template>   <van-dialog     v-model:show="show"     title="Hi,国庆节快乐"     theme="round-button"     confirmButtonText="好"   >     <div class="blessing">       <ol>         <li>👀 上传头像</li>         <li>🎨 选择一个模板</li>         <li>🎉 保存新头像</li>       </ol>       <p>——来自 <a href="https://www.cnblogs.com/guangzan/">@guangzan</a></p>     </div>   </van-dialog> </template>  <style lang="scss"> .blessing {   padding: 20px;   h4 {     margin-bottom: 16px;   }   p {     margin: 4px 0;     font-size: 12px;     color: #666;     text-align: right;   }   ol {     margin-left: 20px;     list-style: auto;     li {       margin-bottom: 4px;     }   }   a {     color: #b8251b;   } } </style> 
Congratulate.vue
<template>   <div class="container">     <div class="wrapper">       <div class="confetti-201"></div>       <div class="confetti-200"></div>       <div class="confetti-199"></div>       <div class="confetti-198"></div>       <div class="confetti-197"></div>       <div class="confetti-196"></div>       <div class="confetti-195"></div>       <div class="confetti-194"></div>       <div class="confetti-193"></div>       <div class="confetti-192"></div>       <div class="confetti-191"></div>       <div class="confetti-190"></div>       <div class="confetti-189"></div>       <div class="confetti-188"></div>       <div class="confetti-187"></div>       <div class="confetti-186"></div>       <div class="confetti-185"></div>       <div class="confetti-184"></div>       <div class="confetti-183"></div>       <div class="confetti-182"></div>       <div class="confetti-181"></div>       <div class="confetti-180"></div>       <div class="confetti-179"></div>       <div class="confetti-178"></div>       <div class="confetti-177"></div>       <div class="confetti-176"></div>       <div class="confetti-175"></div>       <div class="confetti-174"></div>       <div class="confetti-173"></div>       <div class="confetti-172"></div>       <div class="confetti-171"></div>       <div class="confetti-170"></div>       <div class="confetti-169"></div>       <div class="confetti-168"></div>       <div class="confetti-167"></div>       <div class="confetti-166"></div>       <div class="confetti-165"></div>       <div class="confetti-164"></div>       <div class="confetti-163"></div>       <div class="confetti-162"></div>       <div class="confetti-161"></div>       <div class="confetti-160"></div>       <div class="confetti-159"></div>       <div class="confetti-158"></div>       <div class="confetti-157"></div>       <div class="confetti-156"></div>       <div class="confetti-155"></div>       <div class="confetti-154"></div>       <div class="confetti-153"></div>       <div class="confetti-152"></div>       <div class="confetti-151"></div>       <div class="confetti-150"></div>       <div class="confetti-149"></div>       <div class="confetti-148"></div>       <div class="confetti-147"></div>       <div class="confetti-146"></div>       <div class="confetti-145"></div>       <div class="confetti-144"></div>       <div class="confetti-143"></div>       <div class="confetti-142"></div>       <div class="confetti-141"></div>       <div class="confetti-140"></div>       <div class="confetti-139"></div>       <div class="confetti-138"></div>       <div class="confetti-137"></div>       <div class="confetti-136"></div>       <div class="confetti-135"></div>       <div class="confetti-134"></div>       <div class="confetti-133"></div>       <div class="confetti-132"></div>       <div class="confetti-131"></div>       <div class="confetti-130"></div>       <div class="confetti-129"></div>       <div class="confetti-128"></div>       <div class="confetti-127"></div>       <div class="confetti-126"></div>       <div class="confetti-125"></div>       <div class="confetti-124"></div>       <div class="confetti-123"></div>       <div class="confetti-122"></div>       <div class="confetti-121"></div>       <div class="confetti-120"></div>       <div class="confetti-119"></div>       <div class="confetti-118"></div>       <div class="confetti-117"></div>       <div class="confetti-116"></div>       <div class="confetti-115"></div>       <div class="confetti-114"></div>       <div class="confetti-113"></div>       <div class="confetti-112"></div>       <div class="confetti-111"></div>       <div class="confetti-110"></div>       <div class="confetti-109"></div>       <div class="confetti-108"></div>       <div class="confetti-107"></div>       <div class="confetti-106"></div>       <div class="confetti-105"></div>       <div class="confetti-104"></div>       <div class="confetti-103"></div>       <div class="confetti-102"></div>       <div class="confetti-101"></div>       <div class="confetti-100"></div>       <div class="confetti-99"></div>       <div class="confetti-98"></div>       <div class="confetti-97"></div>       <div class="confetti-96"></div>       <div class="confetti-95"></div>       <div class="confetti-94"></div>       <div class="confetti-93"></div>       <div class="confetti-92"></div>       <div class="confetti-91"></div>       <div class="confetti-90"></div>       <div class="confetti-89"></div>       <div class="confetti-88"></div>       <div class="confetti-87"></div>       <div class="confetti-86"></div>       <div class="confetti-85"></div>       <div class="confetti-84"></div>       <div class="confetti-83"></div>       <div class="confetti-82"></div>       <div class="confetti-81"></div>       <div class="confetti-80"></div>       <div class="confetti-79"></div>       <div class="confetti-78"></div>       <div class="confetti-77"></div>       <div class="confetti-76"></div>       <div class="confetti-75"></div>       <div class="confetti-74"></div>       <div class="confetti-73"></div>       <div class="confetti-72"></div>       <div class="confetti-71"></div>       <div class="confetti-70"></div>       <div class="confetti-69"></div>       <div class="confetti-68"></div>       <div class="confetti-67"></div>       <div class="confetti-66"></div>       <div class="confetti-65"></div>       <div class="confetti-64"></div>       <div class="confetti-63"></div>       <div class="confetti-62"></div>       <div class="confetti-61"></div>       <div class="confetti-60"></div>       <div class="confetti-59"></div>       <div class="confetti-58"></div>       <div class="confetti-57"></div>       <div class="confetti-56"></div>       <div class="confetti-55"></div>       <div class="confetti-54"></div>       <div class="confetti-53"></div>       <div class="confetti-52"></div>       <div class="confetti-51"></div>       <div class="confetti-50"></div>       <div class="confetti-49"></div>       <div class="confetti-48"></div>       <div class="confetti-47"></div>       <div class="confetti-46"></div>       <div class="confetti-45"></div>       <div class="confetti-44"></div>       <div class="confetti-43"></div>       <div class="confetti-42"></div>       <div class="confetti-41"></div>       <div class="confetti-40"></div>       <div class="confetti-39"></div>       <div class="confetti-38"></div>       <div class="confetti-37"></div>       <div class="confetti-36"></div>       <div class="confetti-35"></div>       <div class="confetti-34"></div>       <div class="confetti-33"></div>       <div class="confetti-32"></div>       <div class="confetti-31"></div>       <div class="confetti-30"></div>       <div class="confetti-29"></div>       <div class="confetti-28"></div>       <div class="confetti-27"></div>       <div class="confetti-26"></div>       <div class="confetti-25"></div>       <div class="confetti-24"></div>       <div class="confetti-23"></div>       <div class="confetti-22"></div>       <div class="confetti-21"></div>       <div class="confetti-20"></div>       <div class="confetti-19"></div>       <div class="confetti-18"></div>       <div class="confetti-17"></div>       <div class="confetti-16"></div>       <div class="confetti-15"></div>       <div class="confetti-14"></div>       <div class="confetti-13"></div>       <div class="confetti-12"></div>       <div class="confetti-11"></div>       <div class="confetti-10"></div>       <div class="confetti-9"></div>       <div class="confetti-8"></div>       <div class="confetti-7"></div>       <div class="confetti-6"></div>       <div class="confetti-5"></div>       <div class="confetti-4"></div>       <div class="confetti-3"></div>       <div class="confetti-2"></div>       <div class="confetti-1"></div>       <div class="confetti-0"></div>     </div>   </div> </template>  <style scoped lang="scss"> .container {   position: absolute;   top: 0;   bottom: 0;   right: 0;   left: 0;   overflow: hidden; } .wrapper {   position: relative;   height: 100vh;   display: flex;   flex-wrap: wrap; }  .logo {   display: flex;   justify-content: center;   margin: auto; }  [class|='confetti'] {   position: absolute; }  $colors: (#d13447, #ffbf00, #263672);  @for $i from 0 through 200 {   $w: random(8);   $l: random(100);   .confetti-#{$i} {     width: #{$w}px;     height: #{$w * 0.4}px;     background-color: nth($colors, random(3));     top: -10%;     left: unquote($l + '%');     opacity: random() + 0.5;     transform: rotate(#{random() * 360}deg);     animation: drop-#{$i} unquote(4 + random() + 's') unquote(random() + 's');   }    @keyframes drop-#{$i} {     100% {       top: 110%;       left: unquote($l + random(15) + '%');     }   } } </style> 

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