移动端 Vue+Vant 的Uploader 实现上传、压缩、旋转图片功能

面向百度开发

html

 <van-uploader :after-read="onread" accept="image/*">
    <img src="./icon_input_add.png" />
 </van-uploader>

js

data() {
    return {
      files: {
        name: "",
        type: ""
      },
      headerimage: null,
      picvalue: null,
      upimgurl,
    }
  },
  // 组件方法 获取 流
  async onread(file) {
      // console.log(file);
      // console.log(file.file);
      this.files.name = file.file.name; // 获取文件名
      this.files.type = file.file.type; // 获取类型
      this.picvalue = file.file; // 文件流
      this.imgpreview(this.picvalue);
    },
    // 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
      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 () {
          // console.log(this.result);
          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) {
            self.headerimage = this.result;
            self.postimg();
          } else {
            img.onload = function () {
              let data = self.compress(img, orientation);
              self.headerimage = data;
              self.postimg();
            };
          }
        };
      }
    },
    // 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
      });
    },
    //这里写接口 
    async postimg() {
      let file = this.dataurltofile(this.headerimage);
      let formdata = new window.formdata();
      formdata.append("file", file);
      toast_loding(this, "图片上传中···");
      try {
        let res = await util.ajax.post(this.upimgurl, formdata, {
          headers: {
            "content-type": "multipart/form-data"
          }
        });
      } catch (e) {
        console.log(e);
      }
    }

总结

以上所述是小编给大家介绍的移动端 vue+vant 的uploader 实现上传、压缩、旋转图片功能,希望对大家有所帮助