element-ui上传图片>解析成base64格式>并在页面中显示

效果：

结构：

  <div>
            <div class="badege_box">
                <el-upload
                    class="avatar-uploader"
                    action=""
                    accept=".jpg,.jpeg,.webp,.png,.JPG,.JPEG"
                    :show-file-list="false"
                    :auto-upload="false"
                    :on-change="getFile">
                    <div class="uploadImg">
                        <img class="upload_icon_img" src="@/assets/images/baseMessage/upload.png" alt="">
                        <span>点击上传图片span>
                    div>
                el-upload>
                <div class="badge_size">
                    <div class="maximum">
                        <img class="school_badge_img" v-if="imageUrl" :src="imageUrl">
                    div>
                    <div class="big">
                        <img class="school_badge_img" v-if="imageUrl" :src="imageUrl">
                    div>
                    <div class="small">
                        <img class="school_badge_img" v-if="imageUrl" :src="imageUrl">
                    div>

                div>
            div>

            <div  class="upload_btn_badege">
                <el-button type="primary" class="preserve" @click="submitImg">保存el-button>
                
            div>

        div>

 .main_content {
        .badege_box {
            display: flex;
            flex-direction: row;
            .uploadImg {
                width: 344px;
                height: 344px;
                text-align: center;
                background-color: #f8f9fc;
                display: flex;
                flex-direction: column;
                align-items: center;
                padding-top: 80px;
                box-sizing: border-box;
                .upload_icon_img {
                    height: 100px;
                    width: 100px;
                }
                .school_badge_img {
                    height: 100%;
                    width: 100%;
                }
                span {
                    font-size: 18px;
                    font-weight: 400;
                    color: rgba(210, 222, 236, 1);
                }
                // background: #f8f9fc url('') no-repeat center center;
            }
            .badge_size {
                margin-left: 20px;
                div {
                    background-color: #f8f9fc;
                    margin-bottom: 10px;
                    img {
                        width: 100%;
                        height: 100%;
                    }
                }
                .maximum {
                    width: 160px;
                    height: 160px;
                }
                .big {
                    height: 100px;
                    width: 100px;
                }
                .small {
                    width: 60px;
                    height: 60px;
                }
            }
        }
        .upload_btn_badege {
            margin-top: 40px;
            .preserve {
                width: 160px;
            }
            .reset {
                margin-left: 20px;
            }
        }
    }

js:

export default {
    data() {
      return {
        imageUrl: '',
        imgs:''
      };
    },
    methods: {
      submitImg(){
      //把this.imgs传给后台就行了
      },
      resetImg(){
          this.imageUrl='';
          this.imgs='';
      },

      getFile(file, fileList) {
        this.getBase64(file.raw).then(res => {
             this.imageUrl = res;
           let badegeImg = this.imageUrl.split(',');
           this.imgs =  badegeImg[1];
          console.log(this.imgs);
        });
      },
      getBase64(file) {
        return new Promise(function(resolve, reject) {
          let reader = new FileReader();
          let imgResult = "";
          reader.readAsDataURL(file);
          reader.onload = function() {
            imgResult = reader.result;
          };
          reader.onerror = function(error) {
            reject(error);
          };
          reader.onloadend = function() {
            resolve(imgResult);
          };
        });
      }


    }
  }