用JavaScript实现一些随机事件

2008-02-23 07:39:16来源:互联网 阅读 ()

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1、随机广告

<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
var how_many_ads = 3;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad =1;
if (ad==1) {
txt="The World's Largest Online Bookstore, Amazon.com";
url="http://www.amazon.com";
alt="amazon.com";
banner="http://imageserv.imgis.com/images/Ad12669St1Sz1Sq1_Ban1.gif";
width="468";
height="60";
}
if (ad==2) {
txt="Palm III by 3Com, in stock!";
url="http://cybershop.com/";
alt="cybershop.com";
banner="http://imageserv.imgis.com/images/Ad13189St1Sz1Sq5_Ban10.gif";
width="468";
height="60";
}
if (ad==3) {
txt="Find it at GoTo.com";
url="http://www.goto.com";
alt="goto.com";
banner="http://imageserv.imgis.com/images/Ad13700St1Sz1Sq1_Ban1.gif";
width="468";
height="60";
}
document.write('<center>');
document.write('<a href=\"' url '\" target=\"_top\">');
document.write('<img src=\"' banner '\" width=')
document.write(width ' height=' height ' ');
document.write('alt=\"' alt '\" border=0>
');
document.write('<small>' txt '</small></a>');
document.write('</center>');
// End -->
</SCRIPT>
2、随机背景颜色

<HTML>
<HEAD>
<TITLE>Random Background</TITLE>

<SCRIPT LANGUAGE="JavaScript">
<!--
function backcolor(form) {
temp = ""
for (var i = 0; i < 16; i ) {
temp = form.color[i].value
if (form.color[i].checked){ document.bgColor = temp }
  }
}
function randombackground() {
document.bgColor = getColor()
}
function getColor(){
currentdate = new Date()
backgroundcolor = currentdate.getSeconds()
if (backgroundcolor > 44)
backgroundcolor = backgroundcolor - 45
else if (backgroundcolor > 29)
backgroundcolor = backgroundcolor - 30
else if (backgroundcolor > 15)
backgroundcolor = backgroundcolor - 16
if (backgroundcolor == 0 )
return "olive";
else if (backgroundcolor == 1 )
return "teal";
else if (backgroundcolor == 2 )
return "red";
else if (backgroundcolor == 3 )
return "blue";
else if (backgroundcolor == 4 )
return "maroon";
else if (backgroundcolor == 5 )
return "navy";
else if (backgroundcolor == 6 )
return "lime";
else if (backgroundcolor == 7 )
return "fuschia";
else if (backgroundcolor == 8 )
return "green";
else if (backgroundcolor == 9 )
return "purple";
else if (backgroundcolor == 10 )
return "gray";
else if (backgroundcolor == 11 )
return "yellow";
else if (backgroundcolor == 12 )
return "aqua";
else if (backgroundcolor == 13 )
return "black";
else if (backgroundcolor == 14 )
return "white";
else if (backgroundcolor == 15 )
return "silver";
}
// End -->
</SCRIPT>
</HEAD>

<BODY BGCOLOR=#ffffff vlink=#0000ff>

<CENTER>
<FORM>
<input type="button" value="随机背景颜色" onClick="randombackground()">
</FORM>
</CENTER>

</body></html>

3、随机背景图案

<HTML>
<HEAD>
<TITLE>Random Images</TITLE>

<SCRIPT LANGUAGE="JavaScript">

today=new Date();
jran=today.getTime();
var number = 3;
var random_number="";
var image="";
var text_color="";

ia=9301;
ic=49297;
im=233280;
jran = (jran*ia ic) % im;
random_number = Math.ceil( (jran/(im*1.0)) *number);

if (random_number==1) {
text_color="000000";
image="bg1.gif";
}
if (random_number==2) {
text_color="000000";
image="bg2.jpg";
}
if (random_number==3) {
text_color="000000";
image="bg3.gif";
}
// End -->
</SCRIPT>
</HEAD>

<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
document.open();
document.write("<BODY BACKGROUND='" image "' TEXT='" text_color "' vlink=#0000ff>");
document.write("<CENTER></CENTER>");
// End -->
</SCRIPT>

<FORM>
<INPUT TYPE="button" VALUE="Reload Page" onClick="window.location='RandomBgImages.htm'">
</FORM>
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
document.write("<CENTER><FONT SIZE=-1 color=red>Background Image: (" image ")</FONT></CENTER>");
// End -->
</SCRIPT>

</body></html>
4、随机图案

把以下代码放在<head></head>之间:
<script language="JavaScript">
a = 4
var slump = Math.random();
var talet = Math.round(slump * (a-1)) 1;
function create() {
    this.src = '
    this.border = '
this.alt = '
}

b = new Array()
for(var i=1; i<=a; i ) { b[i] = new create() }

b[1].src  = "reset.gif"
b[1].border = "0"
b[1].alt  = "111"

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