圖片onload 的問題

困擾很久的問題
想不到換個順序就解決了

http://www.thefutureoftheweb.com/blog/image-onload-isnt-being-called

// evil:
var image = new Image();
image.src = 'image.jpg';
image.onload = function() {
  // sometimes called
  alert('image loaded');
};

// good:
var image = new Image();
image.onload = function() {
  // always called
  alert('image loaded');
};
image.src = 'image.jpg';