一. 安装

npm install vue-cropper --save-dev

二. 在需要使用的页面引入 

import { VueCropper } from "vue-cropper";

三. 使用步骤

  1. 左面使用 vue-cropper，右边是 img 展示图片

  2. 按钮让他放大或者缩小，旋转

<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-cropper
            ref="cropper"
            :img="options.img"
            :info="true"
            :autoCrop="options.autoCrop"
            :autoCropWidth="options.autoCropWidth"
            :autoCropHeight="options.autoCropHeight"
            :fixedBox="options.fixedBox"
            @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" alt="" :style="previews.img" />
          </div>
        </el-col>
      </el-row>
      <br />
      <el-row>
        <el-col :lg="2" :md="2">
          <el-upload
            action="#"
            :http-request="requestUpload"
            :show-file-list="false"
            :before-upload="beforeUpload"
          >
            <el-button>
              选择
              <i class="el-icon-upload el-icon--right"></i>
            </el-button>
          </el-upload>
        </el-col>
        <el-col :lg="{ span: 1, offset: 2 }" :md="2">
          <el-button icon="el-icon-plus" @click="changeScale(1)"> </el-button>
        </el-col>
        <el-col :lg="{ span: 1, offset: 1 }" :md="2">
          <el-button icon="el-icon-minus" @click="changeScale(-1)"> </el-button>
        </el-col>
        <el-col :lg="{ span: 1, offset: 1 }" :md="2">
          <el-button icon="el-icon-refresh-left" @click="rotateLeft()">
          </el-button>
        </el-col>
        <el-col :lg="{ span: 1, offset: 1 }" :md="2">
          <el-button icon="el-icon-refresh-right" @click="rotateRight()">
          </el-button>
        </el-col>
        <el-col :lg="{ span: 2, offset: 6 }" :md="2">
          <el-button type="primary" @click="uploadImg()"> 提 交 </el-button>
        </el-col>
      </el-row>
    </el-dialog>

     // data里面声明的变量
     options: {
        img: "", //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
      },

      // methods里面声明的变量
      // 实时预览
      realTime(data) {
        this.previews = data;
      },
      // 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);
      },

具体可参考： 史上最全基于vue的图片裁剪vue-cropper使用 - 百度文库