Javascript 去除图片 exif 信息#

export const DeleteExif = (file) => {
  var fr = new FileReader();
  fr.onload = function () {
    var dv = new DataView(this.result);
    var offset = 0,
      recess = 0;
    var pieces = [];
    var i = 0;
    if (dv.getUint16(offset) === 0xffd8) {
      offset += 2;
      var app1 = dv.getUint16(offset);
      offset += 2;
      while (offset < dv.byteLength) {
        if (app1 === 0xffe1) {
          pieces[i] = { recess: recess, offset: offset - 2 };
          recess = offset + dv.getUint16(offset);
          i++;
        } else if (app1 === 0xffda) {
          break;
        }
        offset += dv.getUint16(offset);
        var app1 = dv.getUint16(offset);
        offset += 2;
      }
      if (pieces.length > 0) {
        var newPieces = [];
        pieces.forEach(function (v) {
          newPieces.push(this.result.slice(v.recess, v.offset));
        }, this);
        newPieces.push(this.result.slice(recess));
        var br = new Blob(newPieces, { type: "image/jpeg" });
        // br就是处理完成之后的结果，这里在处理完成之后我进行了下载
        const link = document.createElement("a");
        const evt = document.createEvent("MouseEvents");
        link.style.display = "none";
        link.href = window.URL.createObjectURL(br);
        link.download = "me";
        document.body.appendChild(link);
        // 此写法兼容可火狐浏览器
        evt.initEvent("click", false, false);
        link.dispatchEvent(evt);
        document.body.removeChild(link);
      }
    }
  };
  fr.readAsArrayBuffer(file);
};