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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">
#supertext {
position:absolute;% x# a; N- ]/ k. i/ v
left:0;
top:0;( x1 @0 E- \6 y2 E
visibility:hide;
visibility:hidden;
}
</style>
<script language="JavaScript1.2">  |: d; L; R5 P. P; J9 @: Z

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='';1 r% ^0 I, P" X) G3 T

var BallSpeed = 20;7 M; ]  i6 B0 D) e0 I3 ]
var contentWidth;4 s! d$ }1 _. J5 a1 g6 P& @3 q; n
var contentHeight;
var maxBallSpeed = 50;
; \0 L" d7 p* G# A' Z

var xMax;
var yMax;
var xPos = 0;
var yPos = 0;6 q/ u9 ?- V+ W% B* f: D
var xDir = 'right';0 k& L, ^1 T! N
var yDir = 'down';$ z  a$ ]5 ^3 M' o2 C, H% E* S
var superballRunning = true;
var tempBallSpeed;
var currentBallSrc;3 f: e$ e" v$ m
var newXDir;
var newYDir;

function initializeBall() {
if (document.all) {) l) R. W8 V; {
   xMax = document.body.clientWidth
   yMax = document.body.clientHeight: i, o2 @) s3 V
   document.all("supertext").style.visibility = "visible";  j; V4 u: v* S+ d
   contentWidth=supertext.offsetWidth4 j0 d8 K) |; r; C5 ~) _
   contentHeight=supertext.offsetHeight
   }
else if (document.layers) {  Y6 u0 G2 C: ^+ H8 U2 l
   xMax = window.innerWidth;
   yMax = window.innerHeight;
   contentWidth=document.supertext.document.width
   contentHeight=document.supertext.document.height! w: [+ u# {% p! e: F+ k: t
   document.layers["supertext"].visibility = "show";
   }
setTimeout('moveBall()',400);5 q1 {4 \+ N* d& ^! B( d9 I7 X8 a
if (hidetimer!='')/ x% z2 j+ |. c% m0 E: f! H+ l
setTimeout("hidetext()",hidetimer)
}( G0 l  V" ~% H! X/ P& [

function moveBall() {
if (superballRunning == true) {$ J' @1 C9 I8 s" D0 I
   calculatePosition();
   if (document.all) {
      document.all("supertext").style.left = xPos + document.body.scrollLeft;
      document.all("supertext").style.top = yPos + document.body.scrollTop;
      }! l- i! J* I- y( i
   else if (document.layers) {) `; B, s6 n; a4 P  y% _  m' o4 l
      document.layers["supertext"].left = xPos + pageXOffset;
      document.layers["supertext"].top = yPos + pageYOffset;
      }
   animatetext=setTimeout('moveBall()',20);
   }/ \9 X7 W, \' r& V9 F
}

function calculatePosition() {  u# c* d8 z8 j
if (xDir == "right") {" V; X3 P9 |/ Q2 X9 v
   if (xPos > (xMax - contentWidth - BallSpeed)) {
      xDir = "left";7 L3 T* t6 }/ t: u' T, }
      }
   }/ d) ^2 ^3 Q! {: ~* p
else if (xDir == "left") {& s5 w4 [4 e2 U2 `
   if (xPos < (0 + BallSpeed)) {: f# d/ T3 ?6 w1 D, J) ?
      xDir = "right";
      }
   }$ |, B+ ~4 ~' [7 c2 f
if (yDir == "down") {9 q; p8 C, ~- Z, @
   if (yPos > (yMax - contentHeight - BallSpeed)) {2 v" F, Q) S7 n9 z; w* J
      yDir = "up";
      }
   }2 l) X) G6 |! _
else if (yDir == "up") {
   if (yPos < (0 + BallSpeed)) {
      yDir = "down";
      }) S0 z  E- |9 k& i1 b
   }
if (xDir == "right") {
   xPos = xPos + BallSpeed;
   }; O  I' p- P) Q5 z( t! o* K
else if (xDir == "left") {
   xPos = xPos - BallSpeed;
   }% G& y* `; g7 \- T. r
else {
   xPos = xPos;
   }
if (yDir == "down") {2 b5 K/ c+ a6 P( D/ U( J. T
   yPos = yPos + BallSpeed;
   }" s7 o$ K' h" Q: J. Q
else if (yDir == "up") {8 D) y  A/ `+ Z& }( J
   yPos = yPos - BallSpeed;
   }
else {
   yPos = yPos;
   }
}8 a( h) A6 x0 I2 {+ b
3 [6 X, Z. ?" u# B. g
function hidetext(){
if (document.all)
supertext.style.visibility="hidden"
else if (document.layers)
document.supertext.visibility="hide"5 M$ H9 F4 ]+ [, F; e9 E
clearTimeout(animatetext)  G2 e: H3 e/ U7 k
}$ E0 r8 ~) `( b# O3 P  A. [9 i

if (document.all||document.layers){
document.write('<span id="supertext"><nobr>'+thecontent+'</nobr></span>')
window.onload = initializeBall;
window.onresize = new Function("window.location.reload()");, N; I0 W: z1 t/ B& D
}

</script>

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