JavaScript uses DIV to simulate pop-up windows_form scrolling following_javascript skills

<title>Scrollable follow pop-up box effect code - Script Home</title> <div id="pop" style="border:1px solid #CCC;display:none;"> Author: Ding Xue - scroll to follow <br>test<a href="javascript:hidePop();"></a>hide</div> <br> <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><a href="javascript:showPop()"> </a>show<br> <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
[Ctrl A select all Note: If you need to introduce external Js, you need to refresh to execute

] <script> function getPosition() { var top = document.documentElement.scrollTop; var left = document.documentElement.scrollLeft; var height = document.documentElement.clientHeight; var width = document.documentElement.clientWidth; return {top:top,left:left,height:height,width:width}; } function showPop(){ var width = 300; //弹出框的宽度 var height = 160; //弹出框的高度 var obj = document.getElementById("pop"); obj.style.display = "block"; obj.style.position = "absolute"; obj.style.zindex = "999"; obj.style.width = width + "px"; obj.style.height = height + "px"; var Position = getPosition(); leftadd = (Position.width-width)/2; topadd = (Position.height-height)/2; obj.style.top = (Position.top + topadd) + "px"; obj.style.left = (Position.left + leftadd) + "px"; window.onscroll = function (){ var Position = getPosition(); obj.style.top = (Position.top + topadd) +"px"; obj.style.left = (Position.left + leftadd) +"px"; }; } function hidePop(){ document.getElementById("pop").style.display = "none"; } </script>