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标题: 网页之不断弹射的文字-特效 [打印本页]

作者: zw2004 时间: 2008-1-21 20:55 标题: 网页之不断弹射的文字-特效

<style type="text/css">1 @  [4 l; ^& g/ Q) J
#supertext {, q# X; k7 `: i& Z( N0 C
position:absolute;8 `- b4 W5 x  O, `1 o1 S' o! H
left:0;! N3 T+ l. |# D6 T# y9 O1 W- ]. y
top:0;
visibility:hide;
visibility:hidden;
}
</style>
<script language="JavaScript1.2">( ]- A" u8 X  U' H

var thecontent='<h2><font size="2" face="宋体" color="FF0000">欢迎光临七色风网页家园</font></h2>'
var hidetimer='';

var BallSpeed = 20;; ^6 j( g3 k; Z9 y; x/ g/ K
var contentWidth;! @9 A5 J3 h: d. b7 W$ C* g) F
var contentHeight;
var maxBallSpeed = 50;

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var xMax;/ L( S/ b6 t, R5 ^' q  r7 W
var yMax;
var xPos = 0;
var yPos = 0;
var xDir = 'right';
var yDir = 'down';/ l- T4 t: s. g* N
var superballRunning = true;, O/ t3 M# r( f6 y4 r+ `! [
var tempBallSpeed;1 u* P! ?# @: `9 @6 S
var currentBallSrc;$ [8 A: J. U3 Z; G7 ]9 [5 ?; g
var newXDir;$ x4 ?' Z$ f  c# T& Q$ H0 ^: I5 A) a
var newYDir;9 N, R5 U8 p. I. Z8 X1 }% k' H
4 z! Z: l+ U' Y
function initializeBall() {: a4 m7 L* X+ {1 ]
if (document.all) {
   xMax = document.body.clientWidth
   yMax = document.body.clientHeight
   document.all("supertext").style.visibility = "visible";
   contentWidth=supertext.offsetWidth
   contentHeight=supertext.offsetHeight  r4 @2 b! ^7 V; s. U
   }
else if (document.layers) {
   xMax = window.innerWidth;2 l9 s, d: _. k8 a& Y
   yMax = window.innerHeight;
   contentWidth=document.supertext.document.width
   contentHeight=document.supertext.document.height$ e! g6 C% k9 V9 M) T- i4 M
   document.layers["supertext"].visibility = "show";
   }' k. ^9 i8 g! G
setTimeout('moveBall()',400);
if (hidetimer!='')6 |) S; Z! a: e" p8 h8 N& e
setTimeout("hidetext()",hidetimer)( B/ ]$ s8 i0 N: d
}
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function moveBall() {
if (superballRunning == true) {
   calculatePosition();
   if (document.all) {, S3 D/ t9 {' l3 }
      document.all("supertext").style.left = xPos + document.body.scrollLeft;
      document.all("supertext").style.top = yPos + document.body.scrollTop;
      }3 R: i0 t  _- a1 t" B
   else if (document.layers) {
      document.layers["supertext"].left = xPos + pageXOffset;  U. Q2 S* s9 q0 z
      document.layers["supertext"].top = yPos + pageYOffset;
      }
   animatetext=setTimeout('moveBall()',20);
   }
}

function calculatePosition() {$ [: ?! ]% x; t- p
if (xDir == "right") {
   if (xPos > (xMax - contentWidth - BallSpeed)) {5 @$ P1 ]0 l: _, n
      xDir = "left";% h& W. m" W" k, A" v
      }
   }
else if (xDir == "left") {
   if (xPos < (0 + BallSpeed)) {
      xDir = "right";$ e- u( V; e$ Z% I7 p2 ]/ Y8 w
      }
   }: P( B! U: g! B* G
if (yDir == "down") {# G$ {& L" L$ ~& f# Y& z  c' b6 V
   if (yPos > (yMax - contentHeight - BallSpeed)) {; T6 I/ J1 x& ]# @5 v" ~# N, R. B, |
      yDir = "up";7 l& m0 j9 d% J6 b- y) J0 r# K
      }+ }- X& ]! |; y7 S( }1 k; b
   }
else if (yDir == "up") {
   if (yPos < (0 + BallSpeed)) {
      yDir = "down";7 Y$ J) Q; {" _! K- N9 d  a. L% c
      }, N0 n7 V+ @- m, e6 R3 z$ I: o2 N
   }
if (xDir == "right") {, x2 m' v% O: |  u6 R5 T6 @' K
   xPos = xPos + BallSpeed;/ \* Q# q% f" b- Z: O
   }
else if (xDir == "left") {
   xPos = xPos - BallSpeed;, W$ F8 N; V# p. }3 R, d
   }! D" R# `$ g5 D! z) R5 B; c5 B
else {
   xPos = xPos;% {8 Q. x5 c$ d8 t4 D$ s
   }
if (yDir == "down") {
   yPos = yPos + BallSpeed;& @5 r" g6 ]( L
   }
else if (yDir == "up") {2 _, @- Y0 |) u7 ]
   yPos = yPos - BallSpeed;
   }
else {+ u/ C: _: T. l6 P' D
   yPos = yPos;# d- s3 A$ n( J% j+ K9 v
   }
}! q2 K* H9 |5 J$ R: Z9 S; P( A+ d" d
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function hidetext(){
if (document.all)9 z! f  Y: ?9 S, l+ f1 \
supertext.style.visibility="hidden"
else if (document.layers); ?: @% ]5 [* _/ d1 Q) d1 N
document.supertext.visibility="hide"
clearTimeout(animatetext)
}3 ~; W% i2 p  n* ]9 o
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if (document.all||document.layers){
document.write('<span id="supertext"><nobr>'+thecontent+'</nobr></span>')
window.onload = initializeBall;2 ^& M, h* A5 t, Y( i9 x* C
window.onresize = new Function("window.location.reload()");! y6 t, l+ E$ D) ?" `, N. z4 d/ b
}
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</script>

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