inputFile.addEventListener('change', function (event) {
    var reader = new FileReader();
    var file = event.target.files[0];
    reader.onload = function(e) {
      var base64 = e.target.result;
          let image = new Image()
          image.src = base64
          image.onload = () => {
            const { width, height } = image
            const ratio = width / height
            console.log(width, height, '图片真实宽高') // 图片真实宽高
          }
    };
    reader.readAsDataURL(file);
});