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<style>
#leftBar
{
width: 100px;
height: 500px;
float: left;
background-color: blue;
}
#rightPage
{
position: relative;
margin-left: 100px;
height: 500px;
}
.btn_toggleLeft
{
position: absolute;
top: 0;
bottom: 0;
width: 20px;
height: 80px;
left: 0;
margin: auto;
background-color: white;
cursor: pointer;
}
.content
{
background-color: lightskyblue;
height: 100%;
}
</style>
<div>
<div id="leftBar" class="leftBar">
</div>
<div id="rightPage" style="">
<div class="btn_toggleLeft" onclick="test()">
你点我啊
</div>
<div class="content">
</div>
</div>
</div>
<script>
function test() {
var leftBar = document.getElementById("leftBar");
var content = document.getElementById("rightPage");
if (leftBar.style.display != "none") {
leftBar.style.display = "none";
content.style.marginLeft = 0;
}
else {
leftBar.style.display = "block";
content.style.marginLeft = "100px";
}
}
</script>