‘vue-cropper‘ 图片裁剪

父组件

        父组件中应用pdateImgBase64组件

  <div class="trademark">
              <updateImgBase64 ref="updateImgBase64" :imageUrl.sync="refineData[row.prop]">
                <template slot="商标">
                  <el-button v-if="refineData[row.prop]" type="text"
                    @click="$refs.updateImgBase64.showCropBox = true">image/jpeg</el-button>
                  <el-button v-else type="primary" @click="$refs.updateImgBase64.showCropBox = true">上传文件</el-button>
                </template>
              </updateImgBase64>
            </div>

子组件

        子组件以弹窗形式进行裁剪图片

<template>
  <div>
    <el-dialog title="图片剪裁" :visible.sync="showCropBox" append-to-body width="950px" :before-close="abolishCropping">
      <div class="cropper-content">
        <div class="cropper-box">
          <div class="cropper">
            <vue-cropper ref="cropper" :img="option.img" :outputSize="option.outputSize" :outputType="option.outputType"
              :info="option.info" :canScale="option.canScale" :autoCrop="option.autoCrop"
              :autoCropWidth="option.autoCropWidth" :autoCropHeight="option.autoCropHeight" :fixed="option.fixed"
              :fixedNumber="option.fixedNumber" :full="option.full" :fixedBox="option.fixedBox"
              :canMove="option.canMove" :canMoveBox="option.canMoveBox" :original="option.original"
              :centerBox="option.centerBox" :height="option.height" :infoTrue="option.infoTrue"
              :maxImgSize="option.maxImgSize" :enlarge="option.enlarge" :mode="option.mode" @realTime="realTime">
            </vue-cropper>
          </div>
          <!--底部操作工具按钮-->
          <div class="footer-btn">
            <div class="upload-btn">
              <label class="btn" for="uploads">选择图片</label>
              <input type="file" id="uploads" style="position:absolute; clip:rect(0 0 0 0);"
                accept="image/png, image/jpeg, image/gif, image/jpg" @change="selectImg($event)">
            </div>
            <div class="scope-btn">
              <el-button size="mini" type="danger" plain icon="el-icon-zoom-in" @click="changeScale(1)">放大</el-button>
              <el-button size="mini" type="danger" plain icon="el-icon-zoom-out" @click="changeScale(-1)">缩小</el-button>
              <el-button size="mini" type="danger" plain @click="rotateLeft">↺ 左旋转</el-button>
              <el-button size="mini" type="danger" plain @click="rotateRight">↻ 右旋转</el-button>
            </div>

          </div>
        </div>
        <!--预览效果图-->
        <div class="show-preview">
          <div :style="previews.div" class="preview">
            <img :src="previews.url" :style="previews.img">
          </div>
          <div class="preview-foot">
            <el-button type="success" @click="finishCropping">裁剪完成</el-button>
            <el-button type="warning" @click="abolishCropping">废除裁剪</el-button>
          </div>
        </div>
      </div>
    </el-dialog>
    <slot name="商标"></slot>
  </div>
</template>
<script>
import { VueCropper } from 'vue-cropper'
export default {
  name: "CropperImage",
  components: {
    VueCropper
  },
  props: {
    imageUrl: {
      type: String,
      default: ''
    },
    name: {
      type: String,
      default: ''
    }
  },
  watch: {
    imageUrl(val) {
      this.option.img = val
    }
  },
  data() {
    return {
      showCropBox: false,
      previews: {},
      option: {
        img: '',             //裁剪图片的地址
        outputSize: 1,       //裁剪生成图片的质量(可选0.1 - 1)
        outputType: 'jpeg',  //裁剪生成图片的格式（jpeg || png || webp）
        info: true,          //裁剪框的大小信息，图片大小信息
        canScale: true,      //图片是否允许滚轮缩放
        autoCrop: true,      //是否默认生成截图框
        autoCropWidth: 300,  //默认生成截图框宽度
        autoCropHeight: 100, //默认生成截图框高度
        fixed: true,         //是否开启截图框宽高固定比例
        fixedNumber: [3, 1], //截图框的宽高比例
        full: true,         //false按原比例裁切图片，不失真
        fixedBox: true,      //固定截图框大小，不允许改变
        canMove: false,      //上传图片是否可以移动
        canMoveBox: true,    //截图框能否拖动
        original: false,     //上传图片按照原始比例渲染
        centerBox: false,    //截图框是否被限制在图片里面
        height: true,        //是否按照设备的dpr 输出等比例图片
        infoTrue: false,     //true为展示真实输出图片宽高，false展示看到的截图框宽高
        maxImgSize: 3000,    //限制图片最大宽度和高度
        enlarge: 1,          //图片根据截图框输出比例倍数
        mode: '230px 150px'  //图片默认渲染方式
      }
    };
  },

  methods: {
    //图片缩放
    changeScale(num) {
      num = num || 1
      this.$refs.cropper.changeScale(num)
    },
    //向左旋转
    rotateLeft() {
      this.$refs.cropper.rotateLeft()
    },
    //向右旋转
    rotateRight() {
      this.$refs.cropper.rotateRight()
    },
    //实时预览函数
    realTime(data) {
      this.previews = data
    },
    //选择图片
    selectImg(e) {
      let file = e.target.files[0]
      if (!file) return
      if (!/.(jpg|jpeg|png|JPG|PNG)$/.test(e.target.value)) {
        this.$message({
          message: '图片类型要求：jpeg、jpg、png',
          type: "error"
        });
        return false
      }
      //转化为blob
      let reader = new FileReader()
      reader.onload = (e) => {
        this.option.img = e.target.result
      }
      //转化为base64
      reader.readAsDataURL(file)
    },
    //完成裁剪
    finishCropping() {
      this.$refs.cropper.getCropData(data => {
        this.$emit('update:imageUrl', data)
        this.abolishCropping()
      })
    },
    abolishCropping() {
      this.showCropBox = false
      Object.assign(this._data, this.$options.data.call(this))
    },
  }
}
</script>
<style scoped lang="scss">
.cropper-content {
  display: flex;
  display: -webkit-flex;
  justify-content: flex-end;

  .cropper-box {
    flex: 1;
    width: 100%;

    .cropper {
      width: auto;
      height: 300px;
    }
  }

  .show-preview {
    margin: 0 0 20px 10px;
    display: flex;
    flex-direction: column;
    width: 35%;

    .preview-foot {
      width: 300px;
      margin-top: 50px;

      .el-button {
        display: block;
        width: 100%;
        margin: 10px 0;
      }

      .el-button+.el-button {
        margin: 0;
      }
    }

    .preview {
      width: 100%;
      overflow: hidden;
      border: 1px solid #67c23a;
      background: #cccccc;
    }
  }
}

.footer-btn {
  margin-top: 30px;
  display: flex;
  display: -webkit-flex;
  justify-content: flex-end;

  .scope-btn {
    display: flex;
    display: -webkit-flex;
    justify-content: space-between;
    padding-right: 10px;
  }

  .upload-btn {
    flex: 1;
    -webkit-flex: 1;
    display: flex;
    display: -webkit-flex;
    justify-content: center;
  }

  .btn {
    outline: none;
    display: inline-block;
    line-height: 1;
    white-space: nowrap;
    cursor: pointer;
    -webkit-appearance: none;
    text-align: center;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    outline: 0;
    -webkit-transition: 0.1s;
    transition: 0.1s;
    font-weight: 500;
    padding: 8px 15px;
    font-size: 12px;
    border-radius: 3px;
    color: #fff;
    background-color: #409eff;
    border-color: #409eff;
    margin-right: 10px;
  }
}
</style>

步骤:

        1.点击上传按钮

        2.

选择图片进行裁剪, 完成后更新父组件base64   废除后关闭子组件 

文章借鉴:https://www.jb51.net/article/230191.htm

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