(编辑:jimmy 日期: 2024/12/27 浏览:2)
先说一下最土的一种方法:
Html:
<div class="tab-head"> <h2 id="tab1" onmouseover="changeTab1()" class="selected">1</h2> <h2 id="tab2" onmouseover="changeTab2()">2</h2> <h2 id="tab3" onmouseover="changeTab3()">3</h2> </div> <div class="tab-content"> <div id="c1" class="show">content1</div> <div id="c2">content2</div> <div id="c3">content3</div> </div>
CSS:
h2 { border-top: solid cornflowerblue 1px; border-left: solid cornflowerblue 1px; width: 50px; height: 25px; margin: 0; float: left; text-align: center; } .tab-content { border: solid cornflowerblue 1px; width: 152px; height: 100px; } .tab-content div{ display: none; } .selected { background-color: cornflowerblue; } .tab-content .show{ display: block; }
JS:
var tab1 = document.getElementById('tab1'), tab2 = document.getElementById('tab2'), tab3 = document.getElementById('tab3'), c1 = document.getElementById('c1'), c2 = document.getElementById('c2'), c3 = document.getElementById('c3'); function changeTab1() { tab1.className = 'selected'; tab2.className = ''; tab3.className = ''; c1.className = 'show' c2.className = ''; c3.className = ''; } function changeTab2() { tab1.className = ''; tab2.className = 'selected'; tab3.className = ''; c1.className = ''; c2.className = 'show'; c3.className = ''; } function changeTab3() { tab1.className = ''; tab2.className = ''; tab3.className = 'selected'; c1.className = '' c2.className = ''; c3.className = 'show'; }
效果:
实现Tab的切换,我们很容易想到的一种方式就是给每一个要控制的标签添加id,然后分别编写鼠标事件,使用id获取每个元素,精确地控制每个元素的样式。
这种方式的缺点显而易见,有几个元素就有几个id,每个tab都要编写function,里面的方法大同小异。要增加tab的话,还要增加id和function,代码冗余,不易扩展。
第二种较为高明些的方法是编写一个function,将每个元素的序号传进去。
Html:
<div class="tab-head"> <h2 onmouseover="changeTab(0)" class="selected">1</h2> <h2 onmouseover="changeTab(1)">2</h2> <h2 onmouseover="changeTab(2)">3</h2> </div> <div class="tab-content"> <div class="show">content1</div> <div>content2</div> <div>content3</div> </div>
JS:
var tabs = document.getElementsByClassName('tab-head')[0].getElementsByTagName('h2'), contents = document.getElementsByClassName('tab-content')[0].getElementsByTagName('div'); function changeTab(index) { for(var i = 0, len = tabs.length; i < len; i++) { if(i === index) { tabs[i].className = 'selected'; contents[i].className = 'show'; }else{ tabs[i].className = ''; contents[i].className = ''; } } }
这样就只要写一个function了,而且不需要id,但是还是要按照顺序传递参数。
第三种方式和第二种基本一样,只是参数传递的是this指针。
Html:
<div class="tab-head"> <h2 onmouseover="changeTab(this)" class="selected">1</h2> <h2 onmouseover="changeTab(this)">2</h2> <h2 onmouseover="changeTab(this)">3</h2> </div> <div class="tab-content"> <div class="show">content1</div> <div>content2</div> <div>content3</div> </div>
JS:
var tabs = document.getElementsByClassName('tab-head')[0].getElementsByTagName('h2'), contents = document.getElementsByClassName('tab-content')[0].getElementsByTagName('div'); function changeTab(tab) { for(var i = 0, len = tabs.length; i < len; i++) { if(tabs[i] === tab) { tabs[i].className = 'selected'; contents[i].className = 'show'; } else { tabs[i].className = ''; contents[i].className = ''; } } }
这种方式稍微方便一些,只要传递this指针,不用按照顺序传递序号,但这也不是最简便的方式。
最简便的一种:
第四种方式:
Html:
<div class="tab-head"> <h2 class="selected">1</h2> <h2>2</h2> <h2>3</h2> </div> <div class="tab-content"> <div class="show">content1</div> <div>content2</div> <div>content3</div> </div>
JS:
var tabs = document.getElementsByClassName('tab-head')[0].getElementsByTagName('h2'), contents = document.getElementsByClassName('tab-content')[0].getElementsByTagName('div'); (function changeTab(tab) { for(var i = 0, len = tabs.length; i < len; i++) { tabs[i].onmouseover = showTab; } })(); function showTab() { for(var i = 0, len = tabs.length; i < len; i++) { if(tabs[i] === this) { tabs[i].className = 'selected'; contents[i].className = 'show'; } else { tabs[i].className = ''; contents[i].className = ''; } } }
这样JS、Html、CSS就完全分离了,通过this指针就可以判断当前鼠标滑过的是哪一个tab了。