鼠标点击，鼠标经过，鼠标离开事件（练习）
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<p onclick="alert('人生寂寞如雪')">点击有惊喜！</p>
<marquee onmouseover="this.stop()"onmouseout="this.start()">我是一只小小鸟！</marquee>
<p onclick="alert('别人都叫我妖孽')" id="a">请叫我罗总</p>
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