代码:
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>选项卡</title>
<style type="text/css">
body {
font-family: "Lato", sans-serif;
}
/* Style the tab */
div.tab {
overflow: hidden;
border: 1px solid #ccc;
background-color: #f1f1f1;
}
/* Style the buttons inside the tab */
div.tab button {
background-color: inherit;
float: left;
border: none;
outline: none;
cursor: pointer;
padding: 14px 16px;
transition: 0.3s;
font-size: 17px;
}
/* Change background color of buttons on hover */
div.tab button:hover {
background-color: #ddd;
}
/* Create an active/current tablink class */
div.tab button.active {
background-color: red;
}
/* Style the tab content */
.tabcontent {
display: none;
padding: 6px 12px;
border: 1px solid #ccc;
border-top: none;
}
</style>
</head>
<body>
<div class="tab">
<button class="tablinks" οnclick="openCity(event, 'London')">London</button>
<button class="tablinks" οnclick="openCity(event, 'Paris')">Paris</button>
<button class="tablinks" οnclick="openCity(event, 'Tokyo')">Tokyo</button>
</div>
<div id="London" class="tabcontent">
<h3>London</h3>
<p>London is the capital city of England.</p>
</div>
<div id="Paris" class="tabcontent">
<h3>Paris</h3>
<p>Paris is the capital of France.</p>
</div>
<div id="Tokyo" class="tabcontent">
<h3>Tokyo</h3>
<p>Tokyo is the capital of Japan.</p>
</div>
<script type="text/javascript">
function openCity(evt, cityName) {
var i, tabcontent, tablinks;
tabcontent = document.getElementsByClassName("tabcontent");
tablinks = document.getElementsByClassName("tablinks");
//所有tabcontent隐藏
for (i = 0; i < tabcontent.length; i++) {
tabcontent[i].style.display = "none";
}
//所有tablinks的active属性设置为空
for (i = 0; i < tablinks.length; i++) {
tablinks[i].className = tablinks[i].className.replace("active", "");
}
document.getElementById(cityName).style.display = "block";
evt.currentTarget.className+=" active"; //currentTarget返回当前绑定事件节点,//active前没有空格,会失效背景颜色,因为这个是在原有class(tabcontent)再添加一个class,两个class直接要有空格隔开,否则class没效果.
}
</script>
</body>
</html>
空格原因:因为这个是在原有class(tabcontent)再添加一个class,两个class直接要有空格隔开,否则class没效果.
效果:
: