小编Gir*_*mar的帖子

$('#btn').on('click', function(e) {
  $('#skm_LockPane').addClass('LockOn');
  var millisecondsToWait = 100;
  setTimeout(function() {
    $('#skm_LockPane').removeClass('LockOn');
  }, millisecondsToWait);

});

 .LockOff {
   display: none;
   visibility: hidden;
 }
 .LockOn {
   overflow: hidden;
   display: block;
   visibility: visible;
   position: absolute;
   z-index: 999;
   top: 0px;
   left: 0px;
   width: 100%;
   height: 100%;
   background-color: blue;
   text-align: center;
   padding-top: 20%;
   filter: alpha(opacity=75);
   opacity: 0.5;
 }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="skm_LockPane" class="LockOff"></div>
<button id="btn">Click!</button>