2024.4.4今天我学习了如何使用若依的vue-cropper上传图片组件，在工作中遇到一个需求，需要对上传的图片进行旋转的操作，然后我先找到el-upload组件，使用之后发现它有一个自动上传和非自动上传的功能，是不是就可以通过非自动上传的功能然后跳一个弹窗，在弹窗里面进行操作再上传。

一、用el-upload

在使用非自动上传之后用on-change事件来触发一个弹窗，把上传的图片先放大显示，然后下面放一个左右旋转的按钮，通过ref  this.$ref.xxx.style.transform修改样式进行旋转，但是这样只能单纯的旋转图片，不能把旋转之后的图片保存下来。

官方地址：

Element - The world's most popular Vue UI framework

二、用vue-cropper

后来百度找到若依有自带上传图片旋转的方法。

官方地址：若依管理系统

官方代码地址：ruoyi-ui/src/views/system/user/profile/userAvatar.vue · 若依/RuoYi-Vue - Gitee.com

效果如下：

完整代码如下：

<template><div><div class="user-info-head" @click="editCropper()"><img v-bind:src="options.img" title="点击上传头像" class="img-circle img-lg" /></div><el-dialog :title="title" :visible.sync="open" width="800px" append-to-body @opened="modalOpened"  @close="closeDialog"><el-row><el-col :xs="24" :md="12" :style="{height: '350px'}"><vue-cropperref="cropper":img="options.img":info="true":autoCrop="options.autoCrop":autoCropWidth="options.autoCropWidth":autoCropHeight="options.autoCropHeight":fixedBox="options.fixedBox":outputType="options.outputType"@realTime="realTime"v-if="visible"/></el-col><el-col :xs="24" :md="12" :style="{height: '350px'}"><div class="avatar-upload-preview"><img :src="previews.url" :style="previews.img" /></div></el-col></el-row><br /><el-row><el-col :lg="2" :sm="3" :xs="3"><el-upload action="#" :http-request="requestUpload" :show-file-list="false" :before-upload="beforeUpload"><el-button size="small">选择<i class="el-icon-upload el-icon--right"></i></el-button></el-upload></el-col><el-col :lg="{span: 1, offset: 2}" :sm="2" :xs="2"><el-button icon="el-icon-plus" size="small" @click="changeScale(1)"></el-button></el-col><el-col :lg="{span: 1, offset: 1}" :sm="2" :xs="2"><el-button icon="el-icon-minus" size="small" @click="changeScale(-1)"></el-button></el-col><el-col :lg="{span: 1, offset: 1}" :sm="2" :xs="2"><el-button icon="el-icon-refresh-left" size="small" @click="rotateLeft()"></el-button></el-col><el-col :lg="{span: 1, offset: 1}" :sm="2" :xs="2"><el-button icon="el-icon-refresh-right" size="small" @click="rotateRight()"></el-button></el-col><el-col :lg="{span: 2, offset: 6}" :sm="2" :xs="2"><el-button type="primary" size="small" @click="uploadImg()">提 交</el-button></el-col></el-row></el-dialog></div>
</template><script>
import store from "@/store";
import { VueCropper } from "vue-cropper";
import { uploadAvatar } from "@/api/system/user";
import { debounce } from '@/utils'export default {components: { VueCropper },data() {return {// 是否显示弹出层open: false,// 是否显示croppervisible: false,// 弹出层标题title: "修改头像",options: {img: store.getters.avatar,  //裁剪图片的地址autoCrop: true,             // 是否默认生成截图框autoCropWidth: 200,         // 默认生成截图框宽度autoCropHeight: 200,        // 默认生成截图框高度fixedBox: true,             // 固定截图框大小 不允许改变outputType:"png",           // 默认生成截图为PNG格式filename: 'avatar'          // 文件名称},previews: {},resizeHandler: null};},methods: {// 编辑头像editCropper() {this.open = true;},// 打开弹出层结束时的回调modalOpened() {this.visible = true;if (!this.resizeHandler) {this.resizeHandler = debounce(() => {this.refresh()}, 100)}window.addEventListener("resize", this.resizeHandler)},// 刷新组件refresh() {this.$refs.cropper.refresh();},// 覆盖默认的上传行为requestUpload() {},// 向左旋转rotateLeft() {this.$refs.cropper.rotateLeft();},// 向右旋转rotateRight() {this.$refs.cropper.rotateRight();},// 图片缩放changeScale(num) {num = num || 1;this.$refs.cropper.changeScale(num);},// 上传预处理beforeUpload(file) {if (file.type.indexOf("image/") == -1) {this.$modal.msgError("文件格式错误，请上传图片类型,如：JPG，PNG后缀的文件。");} else {const reader = new FileReader();reader.readAsDataURL(file);reader.onload = () => {this.options.img = reader.result;this.options.filename = file.name;};}},// 上传图片uploadImg() {this.$refs.cropper.getCropBlob(data => {let formData = new FormData();formData.append("avatarfile", data, this.options.filename);uploadAvatar(formData).then(response => {this.open = false;this.options.img = process.env.VUE_APP_BASE_API + response.imgUrl;store.commit('SET_AVATAR', this.options.img);this.$modal.msgSuccess("修改成功");this.visible = false;});});},// 实时预览realTime(data) {this.previews = data;},// 关闭窗口closeDialog() {this.options.img = store.getters.avatarthis.visible = false;window.removeEventListener("resize", this.resizeHandler)}}
};
</script>
<style scoped lang="scss">
.user-info-head {position: relative;display: inline-block;height: 120px;
}.user-info-head:hover:after {content: '+';position: absolute;left: 0;right: 0;top: 0;bottom: 0;color: #eee;background: rgba(0, 0, 0, 0.5);font-size: 24px;font-style: normal;-webkit-font-smoothing: antialiased;-moz-osx-font-smoothing: grayscale;cursor: pointer;line-height: 110px;border-radius: 50%;
}
</style>