代码如下：<script> function ChangeColor(id,color) { this.colorChangeOver = function (){ document.getElementById(this.id).style.backgroundColor = this.color; } } var color1 = new ChangeColor(document.getElementsByTagName("li")[0].id,"blue"); var color2 = new ChangeColor(document.getElementsByTagName("li")[1].id,"green"); var color3 = new ChangeColor(document.getElementsByTagName("li")[2].id,"red");</script><body> <li id="nav1" onmouseover="color1.colorChangeOver()" ><a href="#">###</a></li> <li id="nav2" onmouseover="color2.colorChangeOver()" ><a href="#">###</a></li> <li id="nav3" onmouseover="color3.colorChangeOver()" ><a href="#">###</a></li></body>为何事件没有被触发，是哪里出问题了吗？
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