这两段代码各表达什么意思?

lap11 2009-07-27 03:09:54

第一段:<script language="JavaScript">


function MM_timelinePlay(tmLnName, myID) { //v1.2
//Copyright 1997 Macromedia, Inc. All rights reserved.
var i,j,tmLn,props,keyFrm,sprite,numKeyFr,firstKeyFr,propNum,theObj,firstTime=false;
if (document.MM_Time == null) MM_initTimelines(); //if *very* 1st time
tmLn = document.MM_Time[tmLnName];
if (myID == null) { myID = ++tmLn.ID; firstTime=true;}//if new call, incr ID
if (myID == tmLn.ID) { //if Im newest
setTimeout('MM_timelinePlay("'+tmLnName+'",'+myID+')',tmLn.delay);
fNew = ++tmLn.curFrame;
for (i=0; i<tmLn.length; i++) {
sprite = tmLn[i];
if (sprite.charAt(0) == 's') {
if (sprite.obj) {
numKeyFr = sprite.keyFrames.length; firstKeyFr = sprite.keyFrames[0];
if (fNew >= firstKeyFr && fNew <= sprite.keyFrames[numKeyFr-1]) {//in range
keyFrm=1;
for (j=0; j<sprite.values.length; j++) {
props = sprite.values[j];
if (numKeyFr != props.length) {
if (props.prop2 == null) sprite.obj[props.prop] = props[fNew-firstKeyFr];
else sprite.obj[props.prop2][props.prop] = props[fNew-firstKeyFr];
} else {
while (keyFrm<numKeyFr && fNew>=sprite.keyFrames[keyFrm]) keyFrm++;
if (firstTime || fNew==sprite.keyFrames[keyFrm-1]) {
if (props.prop2 == null) sprite.obj[props.prop] = props[keyFrm-1];
else sprite.obj[props.prop2][props.prop] = props[keyFrm-1];
} } } } }
} else if (sprite.charAt(0)=='b' && fNew == sprite.frame) eval(sprite.value);
if (fNew > tmLn.lastFrame) tmLn.ID = 0;
} }
}

function MM_timelineGoto(tmLnName, fNew, numGotos) { //v2.0
//Copyright 1997 Macromedia, Inc. All rights reserved.
var i,j,tmLn,props,keyFrm,sprite,numKeyFr,firstKeyFr,lastKeyFr,propNum,theObj;
if (document.MM_Time == null) MM_initTimelines(); //if *very* 1st time
tmLn = document.MM_Time[tmLnName];
if (numGotos != null)
if (tmLn.gotoCount == null) tmLn.gotoCount = 1;
else if (tmLn.gotoCount++ >= numGotos) {tmLn.gotoCount=0; return}
jmpFwd = (fNew > tmLn.curFrame);
for (i = 0; i < tmLn.length; i++) {
sprite = (jmpFwd)? tmLn[i] : tmLn[(tmLn.length-1)-i]; //count bkwds if jumping back
if (sprite.charAt(0) == "s") {
numKeyFr = sprite.keyFrames.length;
firstKeyFr = sprite.keyFrames[0];
lastKeyFr = sprite.keyFrames[numKeyFr - 1];
if ((jmpFwd && fNew<firstKeyFr) || (!jmpFwd && lastKeyFr<fNew)) continue; //skip if untouchd
for (keyFrm=1; keyFrm<numKeyFr && fNew>=sprite.keyFrames[keyFrm]; keyFrm++);
for (j=0; j<sprite.values.length; j++) {
props = sprite.values[j];
if (numKeyFr == props.length) propNum = keyFrm-1 //keyframes only
else propNum = Math.min(Math.max(0,fNew-firstKeyFr),props.length-1); //or keep in legal range
if (sprite.obj != null) {
if (props.prop2 == null) sprite.obj[props.prop] = props[propNum];
else sprite.obj[props.prop2][props.prop] = props[propNum];
} }
} else if (sprite.charAt(0)=='b' && fNew == sprite.frame) eval(sprite.value);
}
tmLn.curFrame = fNew;
if (tmLn.ID == 0) eval('MM_timelinePlay(tmLnName)');
}
//-->
</script>
第二段:
<script Language="JavaScript">
function GookieVal(offset)
//获得Cookie解码后的值
{
var endstr = document.cookie.indexOf (";", offset);
if (endstr == -1)
endstr = document.cookie.length;
return unescape(document.cookie.substring(offset, endstr));
}
function Gookie(name)
//获得Cookie的原始值
{ var arg = name + "=";
var alen = arg.length;
var clen = document.cookie.length;
var i = 0;
while (i < clen)
{
var j = i + alen;
if (document.cookie.substring(i, j) == arg)
return GookieVal (j);
i = document.cookie.indexOf(" ", i) + 1;
if (i == 0) break;
}
return null;
}
function Sookie(name, value)
//设定Cookie值
{ var argv = Sookie.arguments;
var argc = Sookie.arguments.length;
var expires = (argc > 2) ? argv[2] : null;
var path = (argc > 3) ? argv[3] : null;
var domain = (argc > 4) ? argv[4] : null;
var secure = (argc > 5) ? argv[5] : false;
document.cookie = name + "=" + escape (value) +((expires == null) ?"" : (";expires="+expires.toGMTString()))+((path == null) ? "" : ("; path=" + path)) +((domain == null) ? "": ("; domain=" + domain))+((secure == true) ? "; secure" : "");
}
function Dookie(name)
{ var exp = new Date();
exp.setTime (exp.getTime() - 1);
var cval = Gookie (name);
document.cookie = name + "=" + cval + ";expires="+ exp.toGMTString();
}
</script>

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