使用jQuery抓取图像尺寸时遇到问题

$(document).ready(function() {
  var imgWidth = $('img').width();
  var imgHeight = $('img').height();
  console.log('Image width: ' + imgWidth + ', Image height: ' + imgHeight);
});

$(document).ready(function() {
  $('img').on('load', function() {
    var imgWidth = $(this).width();
    var imgHeight = $(this).height();
    console.log('Image width: ' + imgWidth + ', Image height: ' + imgHeight);
  });
});

$(document).ready(function() {
  $('img').on('load', function() {
    var img = new Image();
    img.src = $(this).attr('src');
    img.onload = function() {
      var imgWidth = this.width;
      var imgHeight = this.height;
      console.log('Image width: ' + imgWidth + ', Image height: ' + imgHeight);
    };
  });
});