javascript - Image.width给出0

如果无法自己进行测试，建议您尝试以下操作：

function ValidateSize(file) {
  var FileSize = file.files[0].size / 1024 / 1024; // in MB
  var NewFilze = FileSize.toFixed(2);
  var reader = new FileReader();

  reader.readAsDataURL(fileUpload.files[0]);
  reader.onload = function (e) {
    var image = new Image();
    image.src = e.target.result;
    image.onload = function () {
      var height = this.height;
      var width = this.width;

    if (FileSize > 13) {
       alert("The file size of your picture (" + NewFilze + " MB) exceeds the maximum allowed filesize (12,5 MB). Still problems with resizing your pictures? Use for example www.imageresize.org.");
    }else if(width < 1280){
       alert("The width of your image  (" + width + " pixels) is lower than the required minimum width (1280 pixels)");
    }else{

    }
} 

我应该注意，这未经测试，并且取决于您的js在某些浏览器（最好是chrome或FF）上运行。如果是服务器端，我认为visibleman被链接为最佳答案。

祝你好运，黑客愉快！

归功于我应该获得图像代码的适当位置