<!-- 遮罩層 -->
<div id="cover" style="background: #000; position: absolute; left: 0px; top: 0px; width: 100%; filter: alpha(opacity=30); opacity: 0.3; display: none; z-index: 2 ">
  
</div>
<!-- 彈窗 -->
<div id="showdiv" style="width: 80%; margin: 0 auto; height: 9.5rem; border: 1px solid #999; display: none; position: absolute; top: 40%; left: 10%; z-index: 3; background: #fff">
  <!-- 標題 -->
  <div style="background: #F8F7F7; width: 100%; height: 2rem; font-size: 0.65rem; line-height: 2rem; border: 1px solid #999; text-align: center;" >
    提示
  </div>
  <!-- 內(nèi)容 -->
  <div style="text-indent: 50px; height: 4rem; font-size: 0.5rem; padding: 0.5rem; line-height: 1rem; ">
    js彈窗 js彈出DIV,并使整個頁面背景變暗</div>
  <!-- 按鈕 -->
  <div style="background: #418BCA; width: 80%; margin: 0 auto; height: 1.5rem; line-height: 1.5rem; text-align: center;color: #fff;margin-top: 1rem; -moz-border-radius: .128rem; -webkit-border-radius: .128rem; border-radius: .128rem;font-size: .59733rem;" onclick="closeWindow()">
    確 定
  </div>
</div>

<script type="text/javascript">
  // 彈窗
  function showWindow() {
    $('#showdiv').show();  //顯示彈窗
    $('#cover').css('display','block'); //顯示遮罩層
    $('#cover').css('height',document.body.clientHeight+'px'); //設置遮罩層的高度為當前頁面高度
  }
  // 關(guān)閉彈窗
  function closeWindow() {
    $('#showdiv').hide();  //隱藏彈窗
    $('#cover').css('display','none');   //顯示遮罩層
  }
</script>