1.首先写一个遮罩层div，然后再写一个弹窗的div
<!-- 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>
js代码：（把jq引进来）
<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>
和“=”的区别)
