添加事件侦听器，或让图像通过onload声明自身。然后从那里找出尺寸。
<img id="photo" onload='loaded(this.id)' src="a_really_big_file.jpg" alt="this is some alt text" title="this is some title text" />
添加事件侦听器，或让图像通过onload声明自身。然后从那里找出尺寸。
<img id="photo" onload='loaded(this.id)' src="a_really_big_file.jpg" alt="this is some alt text" title="this is some title text" />
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