論壇頁面的雪花效果如何實現的？
 

Q:
論壇頁面的雪花效果如何實現的？ 下雪的感覺真好！要是會左右漂就更好一點.....
哪位能貼個程式碼上來？
A:
先來一別人的..
<script type="text/javascript">
// 程式作者：風痕影（hit1205@m70.url.com.tw）
// 作者網站：風痕水影（http://student.clhs.tyc.edu.tw/~s010815）
// 製作日期：2004年11月15-17日
n=6; // 雪花數目
wind=0; // 風力
re=60; // 更新
vy=4; // 雪花速度
vx=4; // 搖晃程度
img="http://dob.tnc.edu.tw/authorHD/1/snow.gif"; // 圖檔
img_h=30; // 雪花高
h=250; // 效果範圍高
w=300; // 效果範圍寬
for(i=0;i<n;i++){document.write("<div id=\"snow"+i+"\" style=\"position:absolute;z-index:"+i+";top:-"+(Math.random()*h+img_h)+"px;left:"+Math.random()*(w-img_h)+"px;\"><img src=\""+img+"\" border=\"0\"></div>");}
function snow(){
for(i=0;i<n;i++){
dgs=document.getElementById("snow"+i).style;
if((parseInt(dgs.top)<h)&&(parseInt(dgs.left)<w)&&(parseInt(dgs.left)>-img_h)){
if(Math.round(Math.random())==1){o=1;}else{o=-1;}
dgs.top=parseInt(dgs.top)+vy+"px";
dgs.left=parseInt(dgs.left)+Math.random()*vx*o+wind+"px";
}
else{
dgs.top=-(Math.random()*h+img_h);
dgs.left=Math.random()*(w-img_h);
}
}
setTimeout("snow();",re);
}
</script>

========================================

再一例...............
<SCRIPT language=javascript src="/xmas.js"></SCRIPT>

http://bbs.sloime2.com.tw/xmas.js

xmas.js
document.write('<style>.drop { position: absolute; width: 3; filter: flipV(), flipH(); font-size: 40;color: blue }</style>');

snow = true;
snowsym = " * "
rainsym = " ' "
howmany = 10
if(snow){sym = snowsym; speed=1; angle=10; drops=howmany}
else{sym = rainsym; speed=50; drops=howmany; angle=6}
movex = -speed/angle; movey = speed; count = 0;

function moverain(){
for(move = 0; move < drops; move++){
xx[move]+=movex; yy[move]+=mv[move];
hmm = Math.round(Math.random()*1);
if(xx[move] < 0){xx[move] = maxx+10;}
if(yy[move] > maxy){yy[move] = 10;}
drop[move].left = xx[move]
drop[move].top = yy[move]+document.body.scrollTop;
}setTimeout('moverain()','1')}
if (document.all){
drop = new Array(); xx = new Array(); yy = new Array(); mv = new Array()
ly = "document.all['"; st = "'].style"
for(make = 0; make < drops; make++){
document.write('<div id="drop'+make+'" class=drop>'+sym+'</div>');
drop[make] = eval(ly+'drop'+make+st);
maxx = document.body.clientWidth-40
maxy = document.body.clientHeight-40
xx[make] = Math.random()*maxx;
yy[make] = -100-Math.random()*maxy;
drop[make].left = xx[make]
drop[make].top = yy[make]
mv[make] = (Math.random()*5)+speed/4;
drop[make].fontSize = (Math.random()*10)+20;
if(snow){col = 'white'}else{col = 'blue'}
drop[make].color = col;
}
window.onload=moverain
}

=======================
直接加...雪花就是字串「*」,怕吃記憶體cpu資源的話!user頁面內容過濾裡增加*/xmas.js可以過濾掉。
<SCRIPT language=javascript>
document.write('<style>.drop { position: absolute; width: 3; filter: flipV(), flipH(); font-size: 40;color: blue }</style>');

snow = true;
snowsym = " * "
rainsym = " ' "
howmany = 10
if(snow){sym = snowsym; speed=1; angle=10; drops=howmany}
else{sym = rainsym; speed=50; drops=howmany; angle=6}
movex = -speed/angle; movey = speed; count = 0;

function moverain(){
for(move = 0; move < drops; move++){
xx[move]+=movex; yy[move]+=mv[move];
hmm = Math.round(Math.random()*1);
if(xx[move] < 0){xx[move] = maxx+10;}
if(yy[move] > maxy){yy[move] = 10;}
drop[move].left = xx[move]
drop[move].top = yy[move]+document.body.scrollTop;
}setTimeout('moverain()','1')}
if (document.all){
drop = new Array(); xx = new Array(); yy = new Array(); mv = new Array()
ly = "document.all['"; st = "'].style"
for(make = 0; make < drops; make++){
document.write('<div id="drop'+make+'" class=drop>'+sym+'</div>');
drop[make] = eval(ly+'drop'+make+st);
maxx = document.body.clientWidth-40
maxy = document.body.clientHeight-40
xx[make] = Math.random()*maxx;
yy[make] = -100-Math.random()*maxy;
drop[make].left = xx[make]
drop[make].top = yy[make]
mv[make] = (Math.random()*5)+speed/4;
drop[make].fontSize = (Math.random()*10)+20;
if(snow){col = 'white'}else{col = 'blue'}
drop[make].color = col;
}
window.onload=moverain
}
</SCRIPT>