测量图像的宽度和高度在Chrome和Firefox中返回0，但在Safari中有效

var img = new Image();
img.src = 'image.jpg';
img.onload = function() {
  var width = this.width;
  var height = this.height;
  console.log('宽度：' + width + '，高度：' + height);
};

<div id="image-container" style="background-image: url('image.jpg');"></div>

var imageContainer = document.getElementById('image-container');
var width = imageContainer.offsetWidth;
var height = imageContainer.offsetHeight;
console.log('宽度：' + width + '，高度：' + height);