ylrz_his_scrm_storeUI/src/components/ImageUpload/index.vue

<template>
  <div class="component-upload-image">
    <el-upload
      :action="uploadImgUrl"
      :headers="headers"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      name="file"
      :on-remove="handleRemove"
      :show-file-list="true"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="{hide: this.fileList.length >= this.limit}"
    >
      <i class="el-icon-plus"></i>
    </el-upload>

    <!-- 上传提示 -->
    <!--    <div class="el-upload__tip" slot="tip" v-if="showTip">
          请上传
          <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b> </template>
          <template v-if="fileType"> 格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b> </template>
          的文件
        </div> -->

    <el-dialog
      :visible.sync="dialogVisible"
      title="预览"
      width="800"
      append-to-body
    >
      <img
        :src="dialogImageUrl"
        style="display: block; max-width: 100%; margin: 0 auto"
      />
    </el-dialog>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";

import { Loading } from 'element-ui';

export default {
  props: {
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 10,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 500,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["png", "jpg", "jpeg"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    }
  },
  data() {
    return {
      finalQuality:1,
      dialogImageUrl: "",
      dialogVisible: false,
      hideUpload: false,
      baseUrl: process.env.VUE_APP_BASE_API,
      uploadImgUrl: process.env.VUE_APP_BASE_API+"/common/uploadOSS", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: []
    };
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(',');
          // 然后将数组转为对象数组
          this.fileList = list.map(item => {
            if (typeof item === "string") {
              if (item.indexOf(this.baseUrl) === -1) {
                item = { name: item, url: item };
              } else {
                item = { name: item, url: item };
              }
            }
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true
    }
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    // 删除图片
    handleRemove(file, fileList) {
      const findex = this.fileList.map(f => f.name).indexOf(file.name);
      if(findex > -1) {
        this.fileList.splice(findex, 1);
        this.$emit("input", this.listToString(this.fileList));
      }
    },
    // 上传成功回调
    handleUploadSuccess(res) {
      if (!res || res.code === 401 || !res.url) {
        this.$message.error((res && res.msg) || "上传失败，请重新登录后重试");
        if (this.loading) {
          this.loading.close();
        }
        return;
      }
      this.fileList.push({ name: res.url, url: res.url });
      this.$emit("input", this.listToString(this.fileList));
      this.loading.close();
    },
    // 上传前loading加载
    handleBeforeUpload(file) {
      this.headers.Authorization = "Bearer " + getToken();
      let isImg = false;
      if (this.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = this.fileType.some(type => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
      } else {
        isImg = file.type.indexOf("image") > -1;
      }

      if (!isImg) {
        this.$message.error(
          `文件格式不正确, 请上传${this.fileType.join("/")}图片格式文件!`
        );
        return false;
      }
      return new Promise((resolve, reject) => {
        if (file.size / 1024 / 1024 > 3) {
          this.$message.error('上传的图片不能超过3MB');
          reject();
          return;
        }
        if (file.size / 1024 / 1024 > 1) {
          const loadingInstance = Loading.service({ text: '图片内存过大正在压缩图片...' });
          // 文件大于1MB时进行压缩
          this.compressImage(file).then((compressedFile) => {
            loadingInstance.close();
            if (compressedFile.size / 1024 > 1000) {
              this.$message.error('图片压缩后仍大于1000KB');
              reject();
            } else {
              // this.$message.success(`图片压缩成功，最终质量为: ${this.finalQuality.toFixed(2)}`);
              console.log(`图片压缩成功，最终质量为: ${this.finalQuality.toFixed(2)}`);
              console.log(`最终内存大小为: ${(compressedFile.size/1024).toFixed(2)}KB`);
              resolve(compressedFile);
            }
          }).catch((err) => {
            loadingInstance.close();
            console.error(err);
            reject();
          });
        } else {
          resolve(file);
        }
        this.loading = this.$loading({
          lock: true,
          text: "上传中",
          background: "rgba(0, 0, 0, 0.7)",
        });
      });
      // if (this.fileSize) {
      //   const isLt = file.size / 1024  < this.fileSize;
      //   if (!isLt) {
      //     this.$message.error(`上传头像图片大小不能超过 ${this.fileSize} KB!`);
      //     return false;
      //   }
      // }

    },
    compressImage(file) {
      return new Promise((resolve, reject) => {
        const reader = new FileReader();
        reader.readAsDataURL(file);
        reader.onload = (event) => {
          const img = new Image();
          img.src = event.target.result;
          img.onload = () => {
            const canvas = document.createElement('canvas');
            const ctx = canvas.getContext('2d');
            const width = img.width;
            const height = img.height;
            canvas.width = width;
            canvas.height = height;
            ctx.drawImage(img, 0, 0, width, height);

            let quality = 1; // 初始压缩质量
            let dataURL = canvas.toDataURL('image/jpeg', quality);

            // 逐步压缩，直到图片大小小于500KB并且压缩质量不再降低
            while (dataURL.length / 1024 > 500 && quality > 0.1) {
              quality -= 0.01;
              dataURL = canvas.toDataURL('image/jpeg', quality);
            }
            this.finalQuality = quality; // 存储最终的压缩质量

            if (dataURL.length / 1024 > 1000) {
              reject(new Error('压缩后图片仍然大于1000KB'));
              return;
            }

            const arr = dataURL.split(',');
            const mime = arr[0].match(/:(.*?);/)[1];
            const bstr = atob(arr[1]);
            let n = bstr.length;
            const u8arr = new Uint8Array(n);
            while (n--) {
              u8arr[n] = bstr.charCodeAt(n);
            }
            const compressedFile = new Blob([u8arr], { type: mime });
            compressedFile.name = file.name;
            resolve(compressedFile);
          };
          img.onerror = (error) => {
            reject(error);
          };
        };
        reader.onerror = (error) => {
          reject(error);
        };
      });
    },
    // 文件个数超出
    handleExceed() {
      this.$message.error(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传失败
    handleUploadError() {
      this.$message({
        type: "error",
        message: "上传失败",
      });
      this.loading.close();
    },
    // 预览
    handlePictureCardPreview(file) {
      console.log(file)
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        const url = list[i] && list[i].url;
        if (!url) {
          continue;
        }
        strs += String(url).replace(this.baseUrl, "") + separator;
      }
      return strs != '' ? strs.substr(0, strs.length - 1) : '';
    }
  }
};
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}
// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter, .el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}
</style>