点击遮罩层的背景关闭遮罩层，

<div class="active-rule">
 <div class="active-rule-container"></div>
</div>
 $(".active-rule").click(function() {
  $(".active-rule").hide()
 })
 $(".active-rule-container").click(function(event){
  event.stopPropagation();
 })