JS局部可放大相册代码

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以下是 JS局部可放大相册代码的示例演示效果:
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部分效果截图:
HTML代码(index.html):
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>abc</title>
</head>

<style type="text/css">
	body {
		background: #222;
		overflow: hidden;
		left: 0;
		top: 0;
		width: 100%;
		height: 100%;
		margin: 0;
		padding: 0;
	}
	#screen span {
		position:absolute;
		overflow:hidden;
		border:#FFF solid 1px;
		background:#FFF;
	}
	#screen img{
		position:absolute;
		left:-32px;
		top:-32px;
		cursor: pointer;
	}
	#caption, #title{
		color: #FFF;
		font-family: georgia, 'times new roman', times, veronica, serif;
		font-size: 1em;
		text-align: center;
	}
	#caption b {
		font-size: 2em;
	}

</style>

<script type="text/javascript"><!--
window.onerror = new Function("return true");
var obj = [];
var scr;
var spa;
var img;
var W;
var Wi;
var Hi;
var wi;
var hi;
var Sx;
var Sy;
var M;
var xm;
var ym;
var xb = 0;
var yb = 0;
var ob =  - 1;
var cl = false;

/* needed in standard mode */
px = function(x)
{
	return Math.round(x) + "px";
}

/* center image  - do not resize for perf. reason */
img_center = function(o)
{
	with(img[o])
	{
		style.left = px( - (width - Wi) / 2);
		style.top = px( - (height - Hi) / 2);
	}
}

//////////////////////////////////////////////////////////
var Nx = 4; //size grid x
var Ny = 4; //size grid y
var Tx = 3; // image width
var Ty = 3; // image height
var Mg = 40; // margin
var SP = 1; // speed
//////////////////////////////////////////////////////////

function Cobj(o, x, y)
{
	this.o = o;
	this.ix = Math.min(Nx - Tx, Math.max(0, Math.round(x - (Tx / 2))));
	this.iy = Math.min(Ny - Ty, Math.max(0, Math.round(y - (Ty / 2))));
	this.li = ((this.ix * M + this.ix * Sx) - (x * M + x * Sx)) / SP;
	this.ti = ((this.iy * M + this.iy * Sy) - (y * M + y * Sy)) / SP;
	this.l = 0;
	this.t = 0;
	this.w = 0;
	this.h = 0;
	this.s = 0;
	this.mv = false;
	this.spa = spa[o].style;
	this.img = img[o];
	this.txt = img[o].alt;
	img[o].alt = "";

	/* zooming loop */
	this.zoom = function()
	{
		with(this)
		{
			l += li * s;
			t += ti * s;
			w += wi * s;
			h += hi * s;
			if ((s > 0 && w < Wi) || (s < 0 && w > Sx))
			{
				/* force window.event */
				window.focus();
				/* loop */
				setTimeout("obj[" + o + "].zoom()", 16);
			}
			else
			{
				/* finished */
				mv = false;
				/* set final position */
				if (s > 0)
				{
					l = ix * M + ix * Sx;
					t = iy * M + iy * Sy;
					w = Wi;
					h = Hi;
				}
				else
				{
					l = x * M + x * Sx;
					t = y * M + y * Sy;
					w = Sx;
					h = Sy;
				}
			}
			/* html animation */
			with(spa)
			{
				left = px(l);
				top = px(t);
				width = px(w);
				height = px(h);
				zIndex = Math.round(w);
			}
		}
	}

	this.click = function()
	{
		with(this)
		{
			img_center(o);
			/* zooming logic */
			if ( ! mv || cl)
			{
				if (s > 0)
				{
					if (cl || Math.abs(xm - xb) > Sx * .4 || Math.abs(ym - yb) > Sy * .4)
					{
						s =  - 2;
						mv = true;
						zoom();
						cap.innerHTML = txt;
					}
				}
				else
				{
					if (cl || ob != o)
					{
						if (ob >= 0)
						{
							with(obj[ob])
							{
								s =  - 2;
								mv = true;
								zoom();
							}
						}
						ob = o;
						s = 1;
						xb = xm;
						yb = ym;
						mv = true;
						zoom();
						cap.innerHTML = txt;
					}
				}
			}
		}
	}
	
	/* hook up events */
	img[o].onmouseover = img[o].onmousemove = img[o].onmouseout = new Function("cl=false;obj[" + o + "].click()");
	img[o].onclick = new Function("cl=true;obj[" + o + "].click()");
	img[o].onload = new Function("img_center(" + o + ")");

	/* initial display */
	this.zoom();
}

/* mouse */
document.onmousemove = function(e)
{
	if ( ! e)
	{
		e = window.event;
	}
	xm = (e.x || e.clientX);
	ym = (e.y || e.clientY);
}

/* init */
function load()
{
	/* html elements */
	scr = document.getElementById("screen");
	spa = scr.getElementsByTagName("span");
	img = scr.getElementsByTagName("img");
	cap = document.getElementById("caption");
	
	/* mouseover border */ 
	document.getElementById("border").onmouseover = function()
	{
		cl = true;
		if(ob >= 0 && obj[ob].s > 0) obj[ob].click();
		ob = -1;
	}

	/* global variables */
	W = parseInt(scr.style.width);
	H = parseInt(scr.style.height);
	M = W / Mg;
	Sx = (W - (Nx - 1) * M) / Nx;
	Sy = (H - (Ny - 1) * M) / Ny;
	Wi = Tx * Sx + (Tx - 1) * M;
	Hi = Ty * Sy + (Ty - 1) * M;
	SP = M * Tx * SP;
	wi = (Wi - Sx) / SP;
	hi = (Hi - Sy) / SP;
	
	/* create objects */
	for (k = 0, i = 0; i < Nx; i ++)
	{
		for (j = 0; j < Ny; j ++)
		{
			obj[k] = new Cobj(k ++, i, j);
		}
	}
}
//-->
</script></head><body>

<div style="position: absolute; left: 50%; top: 50%;">
	<div id="title" style="position: absolute; width: 440px; height: 40px; left: -220px; top: -200px;"></div>
	<div id="border" style="border: 1px solid rgb(85, 85, 85); background: rgb(0, 0, 0) none repeat scroll 0%; position: absolute; width: 440px; height: 340px; left: -220px; top: -170px; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;"></div>
	<div id="screen" style="background: rgb(0, 0, 0) none repeat scroll 0%; position: absolute; width: 400px; height: 300px; left: -200px; top: -150px; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;">
		<span style="left: 0px; top: 0px; width: 93px; height: 68px; z-index: 93;"><img style="left: -11px; top: -9px;" src="imagesttt/im6.jpg" alt=""></span>
		<span style="left: 0px; top: 78px; width: 93px; height: 68px; z-index: 93;"><img style="left: -11px; top: -8px;" src="imagesttt/im2.jpg" alt=""></span>
		<span style="left: 0px; top: 155px; width: 93px; height: 68px; z-index: 93;"><img style="left: -11px; top: -9px;" src="imagesttt/im3.jpg" alt=""></span>
		<span style="left: 0px; top: 233px; width: 93px; height: 68px; z-index: 93;"><img style="left: -11px; top: -9px;" src="imagesttt/im4.jpg" alt=""></span>
		<span style="left: 103px; top: 0px; width: 93px; height: 68px; z-index: 93;"><img style="left: -11px; top: -9px;" src="imagesttt/im5.jpg" alt=""></span>
		<span style="left: 103px; top: 78px; width: 93px; height: 68px; z-index: 93;"><img style="left: -11px; top: -9px;" src="imagesttt/im1.jpg" alt=""></span>
		<span style="left: 103px; top: 155px; width: 93px; height: 68px; z-index: 93;"><img style="left: -11px; top: -9px;" src="imagesttt/im7.jpg" alt=""></span>
		<span style="left: 103px; top: 233px; width: 93px; height: 68px; z-index: 93;"><img style="left: -11px; top: -9px;" src="imagesttt/im18.jpg" alt=""></span>
		<span style="left: 205px; top: 0px; width: 93px; height: 68px; z-index: 93;"><img style="left: -11px; top: -9px;" src="imagesttt/im8.jpg" alt=""></span>
		<span style="left: 205px; top: 78px; width: 93px; height: 68px; z-index: 93;"><img style="left: -11px; top: -9px;" src="imagesttt/im10.jpg" alt=""></span>
		<span style="left: 205px; top: 155px; width: 93px; height: 68px; z-index: 93;"><img style="left: -11px; top: -9px;" src="imagesttt/im12.jpg" alt=""></span>
		<span style="left: 205px; top: 233px; width: 93px; height: 68px; z-index: 93;"><img style="left: -11px; top: -9px;" src="imagesttt/im17.jpg" alt=""></span>
		<span style="left: 308px; top: 0px; width: 93px; height: 68px; z-index: 93;"><img style="left: -11px; top: -9px;" src="imagesttt/im14.jpg" alt=""></span>
		<span style="left: 308px; top: 78px; width: 93px; height: 68px; z-index: 93;"><img style="left: -11px; top: -9px;" src="imagesttt/im15.jpg" alt=""></span>
		<span style="left: 308px; top: 155px; width: 93px; height: 68px; z-index: 93;"><img style="left: -11px; top: -9px;" src="imagesttt/im16.jpg" alt=""></span>
		<span style="left: 308px; top: 233px; width: 93px; height: 68px; z-index: 93;"><img style="left: -11px; top: -9px;" src="imagesttt/im9.jpg" alt=""></span>
	</div>
</div>
<script type="text/javascript"><!--
// starter
load();
//-->
</script>
</body>
</html>
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