<div class="nav">
  <ul>
   <li><a>网站首页</a></li>
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 </div>
 <script type="text/javascript" src="js/jquery.min.js"></script>
 <script type="text/javascript">
  //jQuery time
  var parent, ink, d, x, y;
  $(".nav ul li a").click(function (e) {
   parent = $(this).parent();
   //create .ink element if it doesn't exist
   if (parent.find(".ink").length == 0)
    parent.prepend("<span class='ink'></span>");
   ink = parent.find(".ink");
   //incase of quick double clicks stop the previous animation
   ink.removeClass("animate");
   //set size of .ink
   if (!ink.height() && !ink.width()) {
    //use parent's width or height whichever is larger for the diameter to make a circle which can cover the entire element.
    d = Math.max(parent.outerWidth(), parent.outerHeight());
    ink.css({ height: d, width: d });
   }
   //get click coordinates
   //logic = click coordinates relative to page - parent's position relative to page - half of self height/width to make it controllable from the center;
   x = e.pageX - parent.offset().left - ink.width() / 2;
   y = e.pageY - parent.offset().top - ink.height() / 2;
   //set the position and add class .animate
   ink.css({ top: y + 'px', left: x + 'px' }).addClass("animate");
  })
 </script>