把以下代码插入到css里面，即可实现。

a{
  text-decoration:none; 
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  transition: all 0.5s;
}
a:hover{
  -webkit-animation: neon4 1.5s ease-in-out infinite alternate;
  -moz-animation: neon4 1.5s ease-in-out infinite alternate;
  animation: neon4 1.5s ease-in-out infinite alternate;
  text-decoration: none;
}
/*glow for webkit*/
@-webkit-keyframes neon4 {
  from {
    text-shadow: 0 0 10px #fff,
               0 0 20px  #fff,
               0 0 30px  #fff,
               0 0 40px  #B6FF00,
               0 0 70px  #B6FF00,
               0 0 80px  #B6FF00,
               0 0 100px #B6FF00,
               0 0 150px #B6FF00;
  }
  to {
    text-shadow: 0 0 5px #fff,
               0 0 10px #fff,
               0 0 15px #fff,
               0 0 20px #B6FF00,
               0 0 35px #B6FF00,
               0 0 40px #B6FF00,
               0 0 50px #B6FF00,
               0 0 75px #B6FF00;
  }
}
  
  
/*glow for mozilla*/
@-moz-keyframes neon4 {
  from {
    text-shadow: 0 0 10px #fff,
               0 0 20px  #fff,
               0 0 30px  #fff,
               0 0 40px  #B6FF00,
               0 0 70px  #B6FF00,
               0 0 80px  #B6FF00,
               0 0 100px #B6FF00,
               0 0 150px #B6FF00;
  }
  to {
    text-shadow: 0 0 5px #fff,
               0 0 10px #fff,
               0 0 15px #fff,
               0 0 20px #B6FF00,
               0 0 35px #B6FF00,
               0 0 40px #B6FF00,
               0 0 50px #B6FF00,
               0 0 75px #B6FF00;
  }
}
  
  
/*glow*/
@keyframes neon4 {
  from {
    text-shadow: 0 0 10px #fff,
               0 0 20px  #fff,
               0 0 30px  #fff,
               0 0 40px  #B6FF00,
               0 0 70px  #B6FF00,
               0 0 80px  #B6FF00,
               0 0 100px #B6FF00,
               0 0 150px #B6FF00;
  }
  to {
    text-shadow: 0 0 5px #fff,
               0 0 10px #fff,
               0 0 15px #fff,
               0 0 20px #B6FF00,
               0 0 35px #B6FF00,
               0 0 40px #B6FF00,
               0 0 50px #B6FF00,
               0 0 75px #B6FF00;
  }
}

转自夏玖梦博客