话不多说,请看代码:
document *{ margin:0; padding:0; list-style: none; box-sizing: border-box; } .menu{ position: relative; display: flex; height: 20px; justify-content:space-around; } .menu span{ display: block; width: 100%; height: 100%; text-align: center; } .menu .line{ position: absolute; bottom:0; left: 0; width: 33.33%; height: 1px; background: red; -webkit-transition: all .2s; transition: all .2s; } .main{ position: relative; width: 100%; } .main li{ position: absolute; top:0; left:0; } .hide{ display: none; } .show{ display: block; } menu1 menu2 menu3
- menu1
- menu2
- menu3
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