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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
  <script src="https://code.jquery.com/jquery-3.1.0.js"></script>
</head>
<body>
<div id="wrapper" class="wrapper">
  <button id='btn'>点击</button>
  <div id='popover' class="popover">浮层</div>
</div>
</body>
</html>
 
.wrapper{
  /* border: 1px solid red; */
  position: relative;
  display:inline-block;
}
.popover{
  display: none;
  position: absolute;
  left: 100%;
  top: 0;
  border: 1px solid red;
  padding: 10px;
  margin-left: 10px;
}
/* 三角形*/
.popover::before{
  content: '';
  position: absolute;
  top: 5px;
  right: 100%;
  border: 10px solid transparent;
  border-right-color: red;
} 
.popover::after{
  content: '';
  position: absolute;
  top: 5px;
  right: 100%;
  border: 10px solid transparent;
  border-right-color: #fff;
  margin-right: -1px;
}
 
$(btn).on('click',function () {
  console.log('点击btn')
  $(popover).show()
  setTimeout(function() {
      $(document).one('click',function () { 
          console.log('点击document')
          $(popover).hide()
      })  
  },0)
})
Output

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