SOURCE

$(function(){
  $("a").click(function(){
    $("a").removeClass("red")
    $(this).addClass("red")
	})

})

<a href="javascript:void(0)">测试1</a>
<a href="javascript:void(0)">测试2</a>
<a href="javascript:void(0)">测试3</a>
<a href="javascript:void(0)">测试4</a>
<a href="javascript:void(0)">测试5</a>

body{
  background: black;
}
a{
  color:#ffffff;
  position: relative;
  text-decoration: none;
  font-size: 20px;
  display: inline-block;
  margin: 10px;
  transition: all .3s;
}
.red{
  color:red;
}
a.red:before{
  width: 100%;
  right: 0;
  left: 0;
  background: red;
}
a:before{
  content:"";
  position:absolute;
  width: 0;
  left: 50%;
  right: 50%;
  bottom: -2px;
  height: 2px;
  background: #fff;
  transition: all .3s;
}
a:hover:before{
  width: 100%;
  right: 0;
  left: 0;
}