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煙火背景(一)

語法說明： 

  • 在 var fireNo = 5; 中修改煙火的樣式 
  • 在 var fireSize = 80; 中修改煙火的大小 
  • 在 var speed = 5; 中修改煙火的展開速度 
  • 在 var wa = 6; 中修改特效總使用時間 
  • 在 var fireColor = new Array('#ffffff','#ff0000','#00ff00','#ffff00','#00ffff','#ff00ff','#ff8000','#ff80ff','#ff0080'); 中修改煙火的顏色 
  • 在 setTimeout("hanabi()",2000); 中修改煙火之間間隔的時間(每1秒=1000)
<!--煙火背景_開始-->
<script language="JavaScript">
<!--
<!--在此修改煙火的樣式-->
var fireNo = 5;
<!--在此修改煙火的大小-->
var fireSize = 80;
<!--在此修改煙火的展開速度-->
var speed = 5;
<!--在此修改特效總使用時間-->
var wa = 6;
var space = 15
var fireColor = new Array('#ffffff','#ff0000','#00ff00','#ffff00','#00ffff','#ff00ff','#ff8000','#ff80ff','#ff0080');
var _dom=(document.all?3:(document.getElementById?1:(document.layers?2:0)));
var fireLay="";
for (i=0; i<fireNo*wa; i++) {
    if (_dom == 1 || _dom == 3) {
        fireLay += '<DIV id="fire' + i + '" style="position:absolute; width:1px; height:1px left:0px; top=0px; font-size:1px; background:#FFFFFF;"></DIV>';
    }
    if (_dom == 2) {
        fireLay += '<LAYER name="fire'+ i +'" left="0" top="0" clip="0,0,1,1" bgcolor="#FFFFFF"></LAYER>\n';
    }
}
document.writeln(fireLay);
function getWindowSize() {
    if(_dom == 1 || _dom == 2) {
        win_width = self.innerWidth;
        win_height = self.innerHeight;
    }
    if (_dom == 3) {
        win_width = document.body.clientWidth;
        win_height = document.body.clientHeight;
    }
}
function getScrollPosY() {
    if (_dom == 1) return scrollY;
    if (_dom == 2) return pageYOffset;
    if (_dom == 3) return document.body.scrollTop;
}
function showLayer(layerName){
    if (_dom == 1) document.getElementById(layerName).style.visibility = "visible";
    if (_dom == 2) document.layers[layerName].visibility = "show";
    if (_dom == 3) document.all(layerName).style.visibility = "visible";
}
function hideLayer(layerName){
    if (_dom == 1) document.getElementById(layerName).style.visibility = "hidden";
    if (_dom == 2) document.layers[layerName].visibility = "hide";
    if (_dom == 3) document.all(layerName).style.visibility = "hidden";
}
function hanabi() {
 for (i=0; i<fireNo*wa; i++) {
  if (_dom == 1) var div = document.getElementById("fire" + i).style;
  if (_dom == 2) var div = document.layers["fire" + i];
  if (_dom == 3) var div = document.all("fire" + i).style;
  zure1 = Math.floor(i/fireNo)%2 == 0 ? 0:(Math.PI / fireNo);
  zure2 = Math.floor(i/fireNo) * space;
  ran = (radius1>(fireSize*0.8)) ? Math.floor(Math.random()*20-10) : 0;
  radius2 = (radius1 - zure2) > 0 ? radius1 - zure2 : 0;
  if ((radius1 - zure2) > fireSize) { hideLayer("fire" + i); }
  else { showLayer("fire" + i); }
  div.left = centerX + Math.cos(i * (Math.PI * 2 / fireNo) + zure1) * (radius2) + ran;
  div.top = centerY + Math.sin(i * (Math.PI * 2 / fireNo) + zure1) * (radius2) + ran;
  if (radius2 < fireSize * 0.4) {
   if (_dom == 1 || _dom == 3) {
    div.background = startColor;
    div.width = 1;
    div.height = 1;
   }
   if (_dom == 2){
    div.bgColor = startColor;
    div.clip.width = 1;
    div.clip.height = 1;
   }
  } else if (radius2 < fireSize * 0.8) {
   if (_dom == 1 || _dom == 3) {
    div.width = 2;
    div.height = 2;
   }
   if (_dom == 2){
    div.clip.width = 2;
    div.clip.height = 2;
   }
  } else {
   if (_dom == 1 || _dom == 3) {
    div.background = fireColor[Math.floor(Math.random() * fireColor.length)];
    div.width = Math.floor(Math.random()*2+1);
    div.height = Math.floor(Math.random()*2+1);
   }
   if (_dom == 2){
    div.bgColor = fireColor[Math.floor(Math.random() * fireColor.length)];
    div.clip.width = Math.floor(Math.random()*2+1);
    div.clip.height = Math.floor(Math.random()*2+1);
   }
  }
 }
 radius1 += speed;
 if (radius1 > (fireSize + space * wa)) { setHanabiPos(); }
 else { setTimeout("hanabi()",10);}
}
function setHanabiPos() {
 rev = 0; radius1 = 0;
 getWindowSize(); sclY = getScrollPosY();
 startColor = fireColor[Math.floor(Math.random() * fireColor.length)];
    centerX =  Math.floor(Math.random() * (win_width - (fireSize + space * wa) * 2) + (fireSize + space * wa));
    centerY =  Math.floor(Math.random() * (win_height - (fireSize + space * wa) * 2) + (fireSize + space * wa)) + sclY;
<!--在此修改煙火之間間隔的時間(每1秒=1000)-->
    setTimeout("hanabi()",2000);
}
setHanabiPos();
-->
</script>
<!--煙火背景_結束-->

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