JS弹窗 JS弹出DIV并使整个页面背景变暗功能的实现代码

<!-- 遮罩层 --><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><!-- 弹窗 --><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">  <!-- 标题 -->  <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>  <!-- 内容 -->  <div style="text-indent: 50px; height: 4rem; font-size: 0.5rem; padding: 0.5rem; line-height: 1rem; ">    js弹窗 js弹出DIV,并使整个页面背景变暗</div>  <!-- 按钮 -->  <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()">    确 定  </div></div>

<script type="text/javascript">  // 弹窗  function showWindow() {    $('#showdiv').show();  //显示弹窗    $('#cover').css('display','block'); //显示遮罩层    $('#cover').css('height',document.body.clientHeight+'px'); //设置遮罩层的高度为当前页面高度  }  // 关闭弹窗  function closeWindow() {    $('#showdiv').hide();  //隐藏弹窗    $('#cover').css('display','none');   //显示遮罩层  }</script>