Vue3中怎么实现选取头像并裁剪
最终效果
安装VueCropper组件
yarn add vue-cropper@next
上面的安装值针对Vue3的，如果时Vue2或者想使用其他的方式引用，请访问它的npm官方地址:官方教程。
在组件中引用
使用时也很简单，只需要引入对应的组件和它的样式文件，我这里没有在全局引用，只在我的组件文件中引入
<script>
import { userInfoByRequest } from '../js/api'
import { VueCropper } from 'vue-cropper'
import 'vue-cropper/dist/index.css'
export default {
components: {
VueCropper
},
}然后用
<el-dialog title="头像设置" v-model="showSetAvatarDialog">
<div class="cropperBox">
<vue-cropper ref="cropper" :canMoveBox="false" :img="avatarBase64" :fixedBox="true" :autoCrop="true"
autoCropWidth="200" autoCropHeight="200" outputType="png"></vue-cropper>
</div>
<div class="optionBtn">
<el-button @click="rotateLeft"><i class="fa fa-rotate-left"></i>左旋转</el-button>
<el-button @click="rotateRight"><i class="fa fa-rotate-right"></i>右旋转</el-button>
<el-button @click="getPickAvatar" type="primary"><i class="fa fa-save"></i>保存</el-button>
</div>
</el-dialog>我这里是将它放到一个Dialog弹框中，当选择完图片后会弹出这弹框。
关于它的一些属性可以参考：官方教程中的详细描述，上面用到的属性含义：
canMoveBox：截图框能否移动，默认是可以的，我设置为false，因为我想让图片移动，截图框不动。
img：图片源，可以是图片网址也可以是base64数据。
fixedBox：不允许改变截图框的大小，默认是可以的，这里我设置为了true，因为我想要一个固定长宽的正方形。
autoCrop：是否默认生成截图框，这里设置为了true
autoCropWidth：自动生成截图框的默认宽度
autoCropHeight：自动生成截图框的默认高度
outputType：输出图片的格式，这里我设置为了png格式
获取图片内容
通过下面这种方式，使用它内置的方法获取截取图片的内容
//获取base64格式的截图内容
this.$refs.cropper.getCropData(data => {
// do something
console.log(data)
})
//获取blob格式的截图内容
this.$refs.cropper.getCropBlob(data => {
// do something
console.log(data)
})更多其他的内置方法请参考官方教程中的详细描述。
自定义上传图片
截图组件有了，下面需要我们选择一个图片，然后通过前端转换为base64后弹出截图的组件进行选择，这里用原生的input标签，type为file，但是原生的样式不是我们想要的，演示中我是点击一个相机的小图标后选择图片，这个实现过程如下：
首先将 中加入hidden属性，将它隐藏
然后当点击相机图标时通过js实现点击input的事件
在input标签中定义change事件，进行图片转base64的逻辑
然后将转换的数据设置到全局变量中
完整的代码实现
UserCenter.vue
<template>
<div class="userCenter">
<input id="avatarFile" type="file" hidden @change="selectFile" />
<header>
<div class="avatar">
<div class="back">
<el-tooltip content="返回">
<i @click="back" class="fa fa-arrow-left"></i>
</el-tooltip>
</div>
<div class="topInfo">
<el-avatar :size="120" :src="avatarBlob==null?(userInfo.avatar==null?defaultAvatar:userInfo.avatar):avatarBlob"></el-avatar>
<div class="setAvatar">
<el-tooltip content="修改头像">
<i @click="getFile" class="fa fa-camera"></i>
</el-tooltip>
</div>
<div class="username">{{userInfo.nickName}}</div>
</div>
</div>
</header>
<el-row justify="center">
<el-col :lg="12" :xl="12" :md="18" :sm="20" :xs="20">
<div class="userInfoBox">
<div class="headerOption">
<el-tooltip content="修改用户基本信息,涉及账号的修改请点击底栏的操作按钮">
<el-link @click="editUserInfo"><i class="fa fa-edit"></i></el-link>
</el-tooltip>
</div>
<ul>
<li>
<div class="userInfoTitle">用户名:</div>
<div class="userInfoValue">{{userInfo.username}}</div>
</li>
<li>
<div class="userInfoTitle">邮箱:</div>
<div class="userInfoValue">{{userInfo.email}}</div>
</li>
<li>
<div class="userInfoTitle">昵称:</div>
<div class="userInfoValue">{{userInfo.nickName}}</div>
</li>
<li>
<div class="userInfoTitle">性别:</div>
<div class="userInfoValue">{{userInfo.gender==3?'保密':(userInfo.gender==0?'男':'女')}}</div>
</li>
<li>
<div class="userInfoTitle">年龄:</div>
<div class="userInfoValue">{{userInfo.age}}</div>
</li>
<li>
<div class="userInfoTitle">生日:</div>
<div class="userInfoValue">{{userInfo.birthday}}</div>
</li>
</ul>
</div>
</el-col>
</el-row>
<div class="option">
<el-button class="optionBtn" size="large" round><i class="fa fa-user"></i>用户名修改</el-button>
<el-button class="optionBtn" size="large" round><i class="fa fa-lock"></i>修改密码</el-button>
<el-button class="optionBtn" size="large" round><i class="fa fa-envelope"></i>修改邮箱</el-button>
<el-button class="optionBtn" size="large" round><i class="fa fa-toggle-on"></i>激活邮箱</el-button>
<el-button class="optionBtn" size="large" round><i class="fa fa-power-off"></i>注销账号</el-button>
</div>
<el-dialog title="基本信息" v-model="showUserInfoDialog">
<el-form :model="userInfoForm">
<el-form-item label="昵称">
<el-input placeholder="请输入昵称" v-model="userInfoForm.nickName"></el-input>
</el-form-item>
<el-form-item label="性别">
<el-select v-model="userInfoForm.gender">
<el-option v-for="item in genders" :key="item.id" :label="item.genderName"
:value="item.genderCode"></el-option>
</el-select>
</el-form-item>
<el-form-item label="生日">
<el-date-picker v-model="userInfoForm.birthday" :locale="locale" placeholder="选择出生日期"
value-format="yyyy-MM-dd"></el-date-picker>
</el-form-item>
<div class="submitBtn" >
<el-button @click="showUserInfoDialog=false" type="info">取消</el-button>
<el-button type="primary">确定</el-button>
</div>
</el-form>
</el-dialog>
<el-dialog title="头像设置" v-model="showSetAvatarDialog">
<div class="cropperBox">
<vue-cropper ref="cropper" :canMoveBox="false" :img="avatarBase64" :fixedBox="true" :autoCrop="true"
autoCropWidth="200" autoCropHeight="200" outputType="png"></vue-cropper>
</div>
<div class="optionBtn">
<el-button @click="rotateLeft"><i class="fa fa-rotate-left"></i>左旋转</el-button>
<el-button @click="rotateRight"><i class="fa fa-rotate-right"></i>右旋转</el-button>
<el-button @click="getPickAvatar" type="primary"><i class="fa fa-save"></i>保存</el-button>
</div>
</el-dialog>
</div>
</template>
<script>
import { userInfoByRequest } from '../js/api'
import { VueCropper } from 'vue-cropper'
import 'vue-cropper/dist/index.css'
export default {
components: {
VueCropper
},
data() {
return {
userInfo: {},
defaultAvatar: 'https://cube.elemecdn.com/9/c2/f0ee8a3c7c9638a54940382568c9dpng.png',
userInfoForm: {},
genders: [
{
id: 1,
genderName: '男性',
genderCode: 0,
},
{
id: 2,
genderName: '女性',
genderCode: 1,
},
{
id: 3,
genderName: '保密',
genderCode: 3,
}
],
showUserInfoDialog: false,
showSetAvatarDialog: false,
avatarBase64:'',
avatarBlob: null
}
},
methods: {
back() {
this.$router.go(-1)
},
getUserInfo() {
userInfoByRequest().then(res => {
this.userInfo = res.data;
})
},
editUserInfo() {
this.userInfoForm.nickName = this.userInfo.nickName;
this.userInfoForm.gender = this.userInfo.gender;
this.userInfoForm.birthday = this.userInfo.birthday;
this.showUserInfoDialog = true;
},
getPickAvatar() {
this.$refs.cropper.getCropData(data => {
this.avatarBlob = data
})
this.showSetAvatarDialog = false;
},
rotateLeft() {
this.$refs.cropper.rotateLeft();
},
rotateRight() {
this.$refs.cropper.rotateRight();
},
getFile() {
let fileEle = document.getElementById('avatarFile')
fileEle.click()
},
selectFile(e) {
var file = e.target.files[0];
var filesize = file.size;
var filename = file.name;
var reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = (e) => {
var imgcode = e.target.result;
this.avatarBase64 = imgcode
this.showSetAvatarDialog = true;
}
}
},
mounted() {
this.getUserInfo();
}
}
</script>
<style scoped>
.userCenter {
display: flex;
flex-direction: column;
justify-content: center;
}
.username {
color: #fff;
font-weight: bold;
font-size: 19px;
padding: 0 10px;
}
header {
text-align: center;
padding: 10px;
background-color: #333;
}
.topInfo {
animation: userInfoCard 2s;
-webkit-animation: userInfoCard 2s;
/* Safari and Chrome */
}
.back {
text-align: left;
color: #fff;
position: relative;
left: 10px;
}
.back>i {
cursor: pointer;
}
.userInfoBox {
box-shadow: 2px 3px 10px #D3d7d4;
margin-top: 20px;
padding: 20px;
background-color: #fff;
font-size: 16px;
text-align: center;
border-radius: 4px;
animation: userInfoCard 3s;
-webkit-animation: userInfoCard 3s;
/* Safari and Chrome */
}
.setAvatar {
position: relative;
top: -20px;
font-size: 14px;
color: #000;
margin: -10px;
}
.setAvatar>i {
cursor: pointer;
}
ul>li {
display: flex;
padding: 5px;
}
.userInfoTitle {
font-weight: bold;
width: 100px;
text-align: right;
padding-right: 10px;
}
.option {
width: 100%;
text-align: center;
position: fixed;
bottom: 20px;
border: 1px solid gainsboro;
padding: 10px;
}
.optionBtn {
font-weight: bold;
text-align: center;
margin-top: 10px;
}
.headerOption {
text-align: right;
}
@keyframes userInfoCard {
from {
opacity: 0;
}
to {
opacity: 1;
}
}
@-webkit-keyframes userInfoCard
/* Safari and Chrome */
{
from {
opacity: 0;
}
to {
opacity: 1;
}
}
.cropperBox {
width: 100%;
height: 300px;
}
</style>以上就是Vue3中怎么实现选取头像并裁剪的详细内容，更多请关注其它相关文章！