弹出层

.black_overlay {
                display: none;
                position: absolute;
                top: 0%;
                left: 0%;
                width: 100%;
                height: 100%;
                background-color: black;
                z-index: 1001;
                -moz-opacity: 0.8;
                opacity: .80;
                filter: alpha(opacity=80);
            }

            .white_content {
                display: none;
                position: absolute;
                top: 30%;
                left: 10%;
                width: 80%;
                height: 180px;
                background-color: white;
                z-index: 1002;
                overflow: auto;
                border: 1px solid #D7D7D7;
                border-radius: 10px;
                overflow: hidden;
            }

            <div id="fade" class="black_overlay">
            </div>
            <div id="MyDiv" class="white_content">
                <div style="height: 40px;text-align: center; line-height: 40px;" id="move">
                    <span style="font-size: 16px;color: #4F4F4F;position: relative;left: 20px;">分享文案已复制</span>
                    <span class="mui-pull-right" style="font-size: 32px;color: #D7D7D7;float: right;margin-right: 12px;position: relative;top:-5px" onclick="CloseDiv('MyDiv','fade')">×</span>
                    <textarea class="share_wenan2">安静的建安费第三方接口的撒娇</textarea>
                </div>
                <div style="text-align:center;margin-top: 100px;padding-top: 10px;border-top:1px solid #D7D7D7">
                    <p style="font-size: 12px;text-align:center;padding: 0px;color: #0278ff;">去微信粘贴</p>
                </div>
            </div>

//弹出隐藏层
            function ShowDiv(show_div, bg_div) {
                document.getElementById(show_div).style.display = 'block';
                document.getElementById(bg_div).style.display = 'block';
                var bgdiv = document.getElementById(bg_div);
                bgdiv.style.width = document.body.scrollWidth;
            };
            //关闭弹出层
            function CloseDiv(show_div, bg_div) {
                document.getElementById(show_div).style.display = 'none';
                document.getElementById(bg_div).style.display = 'none';
            };