news_fader.js

bmb的论坛

var frame=50;//frame-range. standard=50
var st=30;//milliseconds between frames. standard=30
var wait=50;//value to display the full text without fade
ie4=document.all&&!document.getElementById;
ns4=document.layers;
DOM2=document.getElementById;
bR=HexToR(bcolor);bG=HexToG(bcolor);bB=HexToB(bcolor);
tR=HexToR(tcolor);tG=HexToG(tcolor);tB=HexToB(tcolor);
bR_m=bR;bG_m=bG;bB_m=bB;tR_m=tR;tG_m=tG;tB_m=tB;
function HexToR(h){return parseInt((cutHex(h)).substring(0,2),16)}
function HexToG(h){return parseInt((cutHex(h)).substring(2,4),16)}
function HexToB(h){return parseInt((cutHex(h)).substring(4,6),16)}
function cutHex(h){return(h.charAt(0)=="#") ? h.substring(1,7):h}
dir=((tR+tG+tB)>(bR+bG+bB)) ? "up":"down";
dirback=((tR+tG+tB)<(bR+bG+bB)) ? "up":"down";
dir_m=dir;index=0;frame_m=frame;framehalf=frame/2;wait_m=wait;
stepR=Math.abs(tR-bR)/framehalf;stepG=Math.abs(tG-bG)/framehalf;stepB=Math.abs(tB-bB)/framehalf;
step=Math.min(Math.round(Math.max(stepR,Math.max(stepG,stepB))),(240/framehalf));
function fade(){if(index>=fcontent.length) index=0;
if(DOM2){document.getElementById("fscroller").innerHTML=begintag+fcontent[index]+closetag;index++;colorfade();}
else if(ie4){document.all.fscroller.innerHTML=begintag+fcontent[index]+closetag;index++;setTimeout("fade()",Math.min(delay,2500));}
else if(ns4){document.fscrollerns.document.fscrollerns_sub.document.write(begintag+fcontent[index]+closetag);
document.fscrollerns.document.fscrollerns_sub.document.close();index++;setTimeout("fade()",Math.min(delay,2500));}}
function colorfade(){if(frame>0){if(frame==framehalf && wait>0){document.getElementById("fscroller").style.color="rgb("+wR+","+wG+","+wB+")";
if(document.getElementById("newslink")){document.getElementById("newslink").style.color="rgb("+wR+","+wG+","+wB+")";}
wait--;setTimeout("colorfade()",50);}
else{if(dir=="down"){if(bR>tR) bR-=step;if(bG>tG) bG-=step;if(bB>tB) bB-=step;}
else{if(bR<tR) bR+=step;if(bG<tG) bG+=step;if(bB<tB) bB+=step;}
document.getElementById("fscroller").style.color="rgb("+bR+","+bG+","+bB+")";
if(document.getElementById("newslink")){document.getElementById("newslink").style.color="rgb("+bR+","+bG+","+bB+")";}
if(frame==framehalf+1){document.getElementById("fscroller").style.color="rgb("+tR+","+tG+","+tB+")";
if(document.getElementById("newslink")){document.getElementById("newslink").style.color="rgb("+bR+","+bG+","+bB+")";}
dir=dirback;wR=tR;wG=tG;wB=tB;tR=bR_m;tG=bG_m;tB=bB_m;}
frame--;setTimeout("colorfade()",st);}}
else{document.getElementById("fscroller").innerHTML=" ";
if(document.getElementById("newslink")){document.getElementById("newslink").innerHTML=" ";}
dir=dir_m;frame=frame_m;wait=wait_m;tR=tR_m;tG=tG_m;tB=tB_m;bR=bR_m;bG=bG_m;bB=bB_m;setTimeout("fade()",delay);}}
if(navigator.appVersion.substring(0,1)<5 && navigator.appName=="Netscape"){
var fwidth=screen.availWidth/2;
var bwidth=screen.availWidth/4;
document.write('<ilayer id=fscrollerns width='+fwidth+' height=35 left='+bwidth+' top=0><layer id=fscrollerns_sub width='+fwidth+' height=35 left=0 top=0></layer></ilayer>');window.onload=fade;}
else if(navigator.userAgent.search(/Opera/)!=-1 || (navigator.platform!="Win32" && navigator.userAgent.indexOf('Gecko')==-1)){
document.open();document.write('<div id=fscroller style="width:90%;height:17px">');
for(i=0;i<fcontent.length;++i){document.write(begintag+fcontent[i]+closetag+'<br>');}
document.write('</div>');document.close();window.onload=fade;}
else{document.write('<div id=fscroller style="width:90%;height:17px"></div>');window.onload=fade;}