vue+vant 实现上传图片压缩功能

<template>
  <van-uploader
    :before-delete="beforeDelete"
    :after-read="afterRead"
    v-model="fileList"
    multiple
    :max-count="maxCount"
  />
</template>

<script>
import Exif from "exif-js";
import { removeAaary } from "@/utils/index";
export default {
  name: "van-small-upload",
  props: {
    maxCount: {
      type: Number,
      default: 1,
    },
  },
  data() {
    return {
      files: {
        name: "",
        type: "",
      },
      fileList: [],
    };
  },
  methods: {
    beforeDelete(i) {
      removeAaary(this.fileList, i);
      this.$emit("beforeDelete", i);
    },
    afterRead(file) {
      this.files.name = file.file.name; // 获取文件名
      this.files.type = file.file.type; // 获取类型
      file.status = "uploading";
      file.message = "上传中...";
      file.id = "";
      this.imgPreview(file.file);
    },
    // 处理图片
    imgPreview(file) {
      let self = this;
      let Orientation;
      //去获取拍照时的信息，解决拍出来的照片旋转问题   npm install exif-js --save   这里需要安装一下包
      Exif.getData(file, function () {
        Orientation = Exif.getTag(this, "Orientation");
      });
      // 看支持不支持FileReader
      if (!file || !window.FileReader) return;
      if (/^image/.test(file.type)) {
        // 创建一个reader
        let reader = new FileReader();
        // 将图片2将转成 base64 格式
        reader.readAsDataURL(file);
        // 读取成功后的回调
        reader.onloadend = function () {
          let result = this.result;
          let img = new Image();
          img.src = result;
          //判断图片是否大于500K,是就直接上传，反之压缩图片
          if (this.result.length <= 500 * 1024) {
            // 上传图片
            self.postImg(this.result);
          } else {
            img.onload = function () {
              let data = self.compress(img, Orientation);
              // 上传图片
              self.postImg(data);
            };
          }
        };
      }
    },
    // 压缩图片
    compress(img, Orientation) {
      let canvas = document.createElement("canvas");
      let ctx = canvas.getContext("2d");
      //瓦片canvas
      let tCanvas = document.createElement("canvas");
      let tctx = tCanvas.getContext("2d");
      // let initSize = img.src.length;
      let width = img.width;
      let height = img.height;
      //如果图片大于四百万像素，计算压缩比并将大小压至400万以下
      let ratio;
      if ((ratio = (width * height) / 4000000) > 1) {
        // console.log("大于400万像素");
        ratio = Math.sqrt(ratio);
        width /= ratio;
        height /= ratio;
      } else {
        ratio = 1;
      }
      canvas.width = width;
      canvas.height = height;
      //    铺底色
      ctx.fillStyle = "#fff";
      ctx.fillRect(0, 0, canvas.width, canvas.height);
      //如果图片像素大于100万则使用瓦片绘制
      let count;
      if ((count = (width * height) / 1000000) > 1) {
        // console.log("超过100W像素");
        count = ~~(Math.sqrt(count) + 1); //计算要分成多少块瓦片
        //      计算每块瓦片的宽和高
        let nw = ~~(width / count);
        let nh = ~~(height / count);
        tCanvas.width = nw;
        tCanvas.height = nh;
        for (let i = 0; i < count; i++) {
          for (let j = 0; j < count; j++) {
            tctx.drawImage(
              img,
              i * nw * ratio,
              j * nh * ratio,
              nw * ratio,
              nh * ratio,
              0,
              0,
              nw,
              nh
            );
            ctx.drawImage(tCanvas, i * nw, j * nh, nw, nh);
          }
        }
      } else {
        ctx.drawImage(img, 0, 0, width, height);
      }
      //修复ios上传图片的时候 被旋转的问题
      if (Orientation != "" && Orientation != 1) {
        switch (Orientation) {
          case 6: //需要顺时针（向左）90度旋转
            this.rotateImg(img, "left", canvas);
            break;
          case 8: //需要逆时针（向右）90度旋转
            this.rotateImg(img, "right", canvas);
            break;
          case 3: //需要180度旋转
            this.rotateImg(img, "right", canvas); //转两次
            this.rotateImg(img, "right", canvas);
            break;
        }
      }
      //进行最小压缩
      let ndata = canvas.toDataURL("image/jpeg", 0.1);
      tCanvas.width = tCanvas.height = canvas.width = canvas.height = 0;
      return ndata;
    },
    // 旋转图片
    rotateImg(img, direction, canvas) {
      //最小与最大旋转方向，图片旋转4次后回到原方向
      const min_step = 0;
      const max_step = 3;
      if (img == null) return;
      //img的高度和宽度不能在img元素隐藏后获取，否则会出错
      let height = img.height;
      let width = img.width;
      let step = 2;
      if (step == null) {
        step = min_step;
      }
      if (direction == "right") {
        step++;
        //旋转到原位置，即超过最大值
        step > max_step && (step = min_step);
      } else {
        step--;
        step < min_step && (step = max_step);
      }
      //旋转角度以弧度值为参数
      let degree = (step * 90 * Math.PI) / 180;
      let ctx = canvas.getContext("2d");
      switch (step) {
        case 0:
          canvas.width = width;
          canvas.height = height;
          ctx.drawImage(img, 0, 0);
          break;
        case 1:
          canvas.width = height;
          canvas.height = width;
          ctx.rotate(degree);
          ctx.drawImage(img, 0, -height);
          break;
        case 2:
          canvas.width = width;
          canvas.height = height;
          ctx.rotate(degree);
          ctx.drawImage(img, -width, -height);
          break;
        case 3:
          canvas.width = height;
          canvas.height = width;
          ctx.rotate(degree);
          ctx.drawImage(img, -width, 0);
          break;
      }
    },
    //将base64转换为文件
    dataURLtoFile(dataurl) {
      var arr = dataurl.split(","),
        bstr = atob(arr[1]),
        n = bstr.length,
        u8arr = new Uint8Array(n);
      while (n--) {
        u8arr[n] = bstr.charCodeAt(n);
      }
      return new File([u8arr], this.files.name, {
        type: this.files.type,
      });
    },
    postImg(base64) {
      let file = this.dataURLtoFile(base64);
      this.$emit("postImg", { file, fileList: this.fileList });
    },
  },
  mounted() {},
};
</script>

<style scoped lang="less"></style>