js放大镜放大图片效果

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> 
<html><head><title>脚本之家 js图片放大镜</title> 
<meta http-equiv="imagetoolbar" content="no"> 
<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>

/* 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>

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