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<html>
<head>
<script type="text/javascript">
var i = 0;
function method(){
var contentTag = document.getElementById("content");
if(i==0){
contentTag.style.display="";//display=""是把div显示出来
i = 1;
}else if(i==1){
contentTag.style.display="none";//display="none"是把div不显示出来
i = 0;
}
}
</script>
<title>Haha</title>
</head>
<body>
<center>
<span id="dw" onclick="method();">点我试试</span>
<div id="content" style="display:none;width:50px;height:100px;background-color:#dde3ec">
<a href="#">连接1</a>
<a href="#">连接2</a>
<a href="#">连接3</a>
</div>
</center>
</body>
</html>
<input type="button" value="点击" onclick="document.getElementById('sel').style.display='block'"/>
<select id="sel" style="width:auto;display:none" >
<option value="1">onmouseover</option>
<option value="2">onmouseout</option>
<option value="3">onfocus</option>
<option value="4">onblur</option>
</select>
<script>
document.getElementById('sel').onchange=function(){
var x=["","onmouseover","onmouseout","onfocus","onblur"];
alert(x[this.value]);
}
</script>