通过点击按钮，实现图片的隐藏与显现，切换。
实现代码：
<style>
.a{
width: 300px;
height: 300px;
border: 1px solid black;
}
.b{
width: 50px;
height: 30px;
float: left;
cursor: pointer;
}
.c{
width: 200px;
height: 200px;
position: relative;
margin-top: 30px;
margin-left: 0px;
}
.c1{
width: 200px;
height: 200px;
position: absolute;
left: 10px;
bottom: 0px;
}
</style>
</head>
<body>
<div class="a">
<div class="b" onclick="show('a1')">11</div>
<div class="b" onclick="show('a2')">22</div>
<div class="b" onclick="show('a3')">33</div>
<div class="c">
<div id="a1" class="c1" style="background-color: #000000;"></div>
<div id="a2" class="c1" style="background-color: red; " ></div>
<div id="a3" class="c1" style="background-color: yellow; "></div>
</div>
</div>
</body>
</html>
<script>
function show(de)
{
var d= document.getElementById(de);
var c= document.getElementsByClassName("c1");
for(var i=0;i<c.length;i++)
{
c[i].style.display="none";
}
d.style.display="block";
}
</script>
