head.js

10款图片展示类的JavaScript代码

document.onselectstart = new Function("return false");
O    = new Array();
box  = 0;
img  = 0;
txt  = 0;
tit  = 0;
W    = 0;
H    = 0;
nI   = 0;
sel  = 0;
si   = 0;
ZOOM = 0;
rImg = 0;
//////////////////
speed = .06; // animation speed
delay = .5; // 1 = no delay
//////////////////

function dText(){
	txt.style.textAlign = tit.style.textAlign = (sel<nI/2)?"left":"right";
	txt.innerHTML = O[sel].tx;
	tit.innerHTML = O[sel].ti;
}

function CObj(n, s, x, tx, ti){
	this.n    = n;
	this.dim  = s;
	this.tx   = tx;
	this.ti   = ti;
	this.is   = img[n];
	this.vz   = 0;
	this.sx   = 0;
	this.x0   = x;
	this.x1   = 0;
	this.zo   = 0;
	this.over = function() {
		with(this){
			if(n!=sel){
				O[sel].dim = 100;
				O[n].dim = ZOOM * 100;
				sel = n;
				l = 0;
				for(k=0; k<nI; k++){
					O[k].x0 = l;
					l += O[k].dim;
				}
				txt.innerHTML = tit.innerHTML = "";
				setTimeout("dText()", 32);
			}
		}
	}
	this.anim = function () {
		with(this){
			vz  = speed*(vz+(x1-sx)*delay);
			x1 -= vz;
			sx  = (n==0)?0:O[n-1].x0+O[n-1].dim;
			zo -= (zo-dim)*speed;
			l   = (x1*si)+6*(n+1);
			w   = zo*si;
			is.style.left   = Math.round(l)+'px';
			is.style.top    = Math.round((H-w*rImg)*.5)+'px';
			is.style.width  = Math.round(w)+'px';
			is.style.height = Math.round(w*rImg)+'px';
			if(sel == n){
				if(sel<nI*.5) {
					tit.style.left = txt.style.left = Math.round(l+w+6)+'px';
				} else {
					tit.style.left = txt.style.left = Math.round(l-(nx*.25)-6)+'px';
				}
				txt.style.top = Math.round(-(w*rImg)*.25)+'px';
				tit.style.top = Math.round((w*rImg)*.33)+'px';
			}
		}
	}
}

function run(){
	for(j in O)O[j].anim();
	setTimeout("run()", 16);
}

function doResize(){
	tit.style.width = Math.round(nx*.25)+'px';
	txt.style.width = Math.round(nx*.25)+'px';
	tit.style.fontSize = (nx/30)+'px';
	txt.style.fontSize = (nx/70)+'px';
	with(box.style){
		width  = Math.round(W)+'px';
		height = Math.round(H)+'px';
		left   = Math.round(nx/2-W/2)+'px';
		top    = Math.round(ny/2-H/2)+'px';
	}
}

function resize(){
	nx = scr.offsetWidth;
	ny = scr.offsetHeight;
	W  =  nx*90/100;
	si = (W-((nI+1)*6))/((ZOOM*100)+((nI-1)*100));
	H  = (100*si*rImg)+14;
	doResize();
}
onresize = resize;

onload = function(){
	scr = document.getElementById("screen");
	box = document.getElementById("box");
	tit = document.getElementById("tit");
	txt = document.getElementById("txt");
	img = box.getElementsByTagName("img");

	Lnk = document.getElementById("lnk").getElementsByTagName("a");
	nI  = img.length;
	ZOOM = nI;
	rImg = img[0].height/img[0].width;
	resize();
	s = ZOOM * 100;
	x = 0;
	tit.innerHTML = img[0].title;
	txt.innerHTML = img[0].alt;
	for(i=0; i<nI; i++) {
		var t = img[i].alt;
		if(Lnk[i].href!="") t+='<br><a href="'+Lnk[i].href+'">'+Lnk[i].innerHTML+'</a>';
		O[i] = new CObj(i, s, x, t, img[i].title);
		img[i].alt = "";
		img[i].title = "";
		img[i].onmousedown = new Function("return false;");
		img[i].onmouseover = new Function('O['+i+'].over();');
		if(Lnk[i].href!=""){
			/* ==== hyperlink ==== */
			img[i].onclick = new Function('window.open("'+Lnk[i].href+'","_blank");');
		}
		x += s;
		s = 100;
	}
	box.style.visibility = "visible";
	run();
}