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<title>用鼠标滚轮滚动控制图片的缩小放大</title>
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<p>将鼠标放在图片上，点击一下，然后滚动鼠标滚轮试试看</p>
<p><img border="0" src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1528862370826&di=17ebe8a1a56a7fc6cc18b22aecd83679&imgtype=0&src=http%3A%2F%2Fb.hiphotos.baidu.com%2Fimage%2Fpic%2Fitem%2F96dda144ad345982b391b10900f431adcbef8415.jpg"
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