关于formdata:vue-上传图片判断大小尺寸

uploadImg(e, record, index) {  const file = e.target.files[0];  // 判断上传图片的大小 限度  if (file.size / 1024 < 1000) {    const that = this;    let imgWidth = "";    let imgHight = "";    // 限度图片的尺寸 为2000*1500    const isSize = new Promise(function(resolve, reject) {      const _URL = window.URL || window.webkitURL;      const img = new Image();      img.onload = function() {        imgWidth = img.width;        imgHight = img.height;        const valid =          img.width === parseInt(2000) && img.height === parseInt(1500);        valid ? resolve() : reject();      };      img.src = _URL.createObjectURL(file);    }).then(      () => {        const formData = new FormData();        formData.append("files", file);        that.loading = true;        // 这里是调取接口        接口名字(formData)          .then(res => {              // 接口胜利操作啥的              that.$message.success("图片上传胜利");              })          .finally(() => {            that.loading = false;          });      },      () => {        // 图片尺寸不对 提醒        this.$message.info(          `图片尺寸应为2000x1500,以后图片尺寸为${imgWidth}x${imgHight}`        );        return Promise.reject();      }    );  } else {    this.$message.info("图片最大1000k");  }}