vue3中图片裁剪，可固定裁剪框比例

简介：

裁剪用的是vue-cropper插件，git地址：https://github.com/xyxiao001/vue-cropper
弹框用到了Element Plus，请npm install element-plus --save安装。

具体用法：

1、安装：npm install vue-cropper@next
2、组件内引入：

import {
    
     VueCropper } from "vue-cropper";
import "vue-cropper/dist/index.css";

3、封装组件myCropper.vue：

<template>
  <el-button text @click="dialogVisible = true">打开弹框</el-button>
  <el-dialog v-model="dialogVisible" width="60%">
    <template #header>
      <div class="dialgo_title">上传背景</div>
    </template>
    <div class="cropper_box">
      <vue-cropper
        autoCrop
        :img="imgUrl"
        ref="cropper"
        centerBox
        :canMove="false"
        :canScale="false"
        :info="false"
        :enlarge="10"
        fixed
        :fixedNumber="fixedNumber"
      />
    </div>
    <template #footer>
      <span class="dialog-footer">
        <el-button @click="dialogVisible = false">取消</el-button>
        <el-button type="primary" @click="confirm"> 确定 </el-button>
      </span>
    </template>
  </el-dialog>
  <img class="cropper_url" :src="cropperUrl" alt="" />
</template>

<script setup>
import {
    
     ref } from "vue";
import {
    
     VueCropper } from "vue-cropper";
import "vue-cropper/dist/index.css";
import imgUrl from "@/assets/img/1.jpg"; //引入的本地图片

const dialogVisible = ref(true);
let cropper = ref(null);
let fixedNumber = ref([9, 16]);
let cropperUrl = ref(""); //截后的图

// 确定截图
function confirm() {
    
    
  cropper.value.startCrop();
  cropper.value.getCropData((data) => {
    
    
    console.log("这里的data是base64格式");
    dialogVisible.value = false;
    // cropperUrl.value = data;
    const image = new Image();
    image.src = data;
    image.onload = () => {
    
    
      const canvas = document.createElement("canvas");
      const ctx = canvas.getContext("2d");
      canvas.width = 900;
      canvas.height = 1600;
      ctx.drawImage(image, 0, 0, canvas.width, canvas.height);
      const croppedImageSrc = canvas.toDataURL("image/png");
      cropperUrl.value = croppedImageSrc;
    };
  });
  // cropper.value.getCropBlob((data) => {
    
    
  //   console.log("这里的data是blob流格式");
  //   const image = new Image();
  //   image.src = URL.createObjectURL(data);
  //   image.onload = () => {
    
    
  //     const canvas = document.createElement("canvas");
  //     const ctx = canvas.getContext("2d");
  //     canvas.width = 900;
  //     canvas.height = 1600;
  //     ctx.drawImage(image, 0, 0, canvas.width, canvas.height);
  //     const croppedImageSrc = canvas.toDataURL("image/png");
  //     cropperUrl.value = croppedImageSrc;
  //   };
  // });
}
</script>
<style lang="scss" scoped>
.dialgo_title {
    
    
  width: 100%;
  text-align: left;
  font-size: 18px;
  color: #333;
  font-family: SourceHanSansCN-Bold;
  font-weight: 700;
}
.cropper_box {
    
    
  width: 100%;
  height: 350px;
  margin: 0 auto;
}
.cropper_url {
    
    
  width: 200px;
  height: auto;
}
</style>
<style>
.el-dialog__footer {
    
    
  width: 100%;
  text-align: center !important;
}
</style>

4、父组件中引入：

<template>
  <div>
    <my-cropper></my-cropper>
  </div>
</template>
<script setup>
import MyCropper from "../components/myCropper.vue";
</script>

5、效果图：

注意：

插件的属性有详细的说明，https://shnhz.github.io/shn-ui/#/component/vue-cropper，我只用到了其中几个，具体根据自己业务进行选择。