JS method to achieve the effect of pop-up layer falling from the top of the web page

JS method to achieve the effect of pop-up layer falling from the top of the web page_javascript skills

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Release： 2016-05-16 15:46:33

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The example in this article describes how to use JS to achieve the effect of pop-up layer falling from the top of the web page. Share it with everyone for your reference. The details are as follows:

The JavaScript animation background pop-up layer introduced here can achieve the feeling of falling from the top of the web page. It also has the meaning of buffering and bouncing when stopped. The animated pop-up layer displayed from top to bottom has a closing function and is not beautified. I like it. When I used it, I started beautifying it, and I thought it was good.

The operation effect is as shown below:

The specific code is as follows:

<HTML><HEAD><TITLE>窗口从上掉下来</TITLE>
</HEAD>
<BODY bgColor=#fef4d9>
<CENTER>
 <span class="STYLE1">窗口从上掉下来</span>
</CENTER><BR>
<CENTER>
<TABLE borderColor=#00FFFF border=5 borderlight="green">
 <TBODY>
 <TR>
  <TD align=middle><span class="STYLE2">效果显示</span></TD>
 </TR>
 <TR>
  <TD align=middle>
<SCRIPT language=JavaScript1.2>
var ie=document.all
var dom=document.getElementById
var ns4=document.layers
var bouncelimit=32 //(must be divisible by 8)
var curtop
var direction="up"
var boxheight=''
function initbox(){
if (!dom&&!ie&&!ns4)
return
crossobj=(dom)&#63;document.getElementById("dropin").style : ie&#63; document.all.dropin : document.dropin
scroll_top=(ie)&#63; document.body.scrollTop : window.pageYOffset
crossobj.top=scroll_top-250
crossobj.visibility=(dom||ie)&#63; "visible" : "show"
dropstart=setInterval("dropin()",50)
}
function dropin(){
scroll_top=(ie)&#63; document.body.scrollTop : window.pageYOffset
if (parseInt(crossobj.top)<100+scroll_top)
crossobj.top=parseInt(crossobj.top)+40
else{
clearInterval(dropstart)
bouncestart=setInterval("bouncein()",50)
}
}
function bouncein(){
crossobj.top=parseInt(crossobj.top)-bouncelimit
if (bouncelimit<0)
bouncelimit+=8
bouncelimit=bouncelimit*-1
if (bouncelimit==0){
clearInterval(bouncestart)
}
}
function dismissbox(){
if (window.bouncestart) clearInterval(bouncestart)
crossobj.visibility="hidden"
}
window.onload=initbox
</SCRIPT>
<DIV id=dropin style="LEFT: 300px; VISIBILITY: hidden; WIDTH: 400px; POSITION: absolute; TOP: 250px; HEIGHT: 200px; BACKGROUND-COLOR: #f5f5f5">
<DIV align=right><A href="javascript:dismissbox()">[关闭窗口]</A></DIV>如果想法改变，态度就会改变；如果习惯改变，人格就会改变；如果命运改变，人生就会改变。</DIV></TD></TR></TBODY></TABLE></CENTER>
</BODY></HTML>

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I hope this article will be helpful to everyone’s JavaScript programming design.