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常见的购物网上图片放大JS效果

2011-06-21 21:36 519 查看

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>购物网上图片放大效果</title>
<style type="text/css">
#magnifier{
width:342px;
height:420px;
position:absolute;
top:100px;
left:250px;
font-size:0;
border:1px solid #000;
}
#img{
width:342px;
height:420px;
}
#Browser{
border:1px solid #000;
z-index:100;
position:absolute;
background:#555;
}
#mag{
border:1px solid #000;
overflow:hidden;
z-index:100;
}
</style>
<script type="text/javascript">
function getEventObject(W3CEvent) { //??
return W3CEvent || window.event;
}
function getPointerPosition(e) { //x,yú
e = e || getEventObject(e);
var x = e.pageX || (e.clientX + (document.documentElement.scrollLeft || document.body.scrollLeft));
var y = e.pageY || (e.clientY + (document.documentElement.scrollTop || document.body.scrollTop));

return { 'x':x,'y':y };
}
function setOpacity(elem,level) { //??
if(elem.filters) {
elem.style.filter = 'alpha(opacity=' + level * 100 + ')';
} else {
elem.style.opacity = level;
}
}
function css(elem,prop) { //cssú,?css?,???
for(var i in prop) {
if(i == 'opacity') {
setOpacity(elem,prop[i]);
} else {
elem.style[i] = prop[i];
}
}
return elem;
}
var magnifier = {
m : null,

init:function(magni){
var m = this.m = magni || {
cont : null, //????div
img : null, //??
mag : null, //?
scale : 15 //?,?????,и?,ЩС??,???ν
}

css(m.img,{
'position' : 'absolute',
'width' : (m.cont.clientWidth * m.scale) + 'px', //????*?
'height' : (m.cont.clientHeight * m.scale) + 'px' //????*?
})

css(m.mag,{
'display' : 'none',
'width' : m.cont.clientWidth + 'px', //m.cont????,????
'height' : m.cont.clientHeight + 'px',
'position' : 'absolute',
'left' : m.cont.offsetLeft + m.cont.offsetWidth + 10 + 'px', //?λ??????10px
'top' : m.cont.offsetTop + 'px'
})

var borderWid = m.cont.getElementsByTagName('div')[0].offsetWidth - m.cont.getElementsByTagName('div')[0].clientWidth; //?border?

css(m.cont.getElementsByTagName('div')[0],{ //m.cont.getElementsByTagName('div')[0]?
'display' : 'none', //???
'width' : m.cont.clientWidth / m.scale - borderWid + 'px', //?????/? - border?
'height' : m.cont.clientHeight / m.scale - borderWid + 'px', //?????/? - border?
'opacity' : 0.5 //?
})

m.img.src = m.cont.getElementsByTagName('img')[0].src; //???src???
m.cont.style.cursor = 'crosshair';

m.cont.onmouseover = magnifier.start;

},

start:function(e){

if(document.all){ //?IE?,?IE6select?
magnifier.createIframe(magnifier.m.img);
}

this.onmousemove = magnifier.move; //this?m.cont
this.onmouseout = magnifier.end;
},

move:function(e){
var pos = getPointerPosition(e); //??

this.getElementsByTagName('div')[0].style.display = '';

css(this.getElementsByTagName('div')[0],{
'top' : Math.min(Math.max(pos.y - this.offsetTop - parseInt(this.getElementsByTagName('div')[0].style.height) / 2,0),this.clientHeight - this.getElementsByTagName('div')[0].offsetHeight) + 'px',
'left' : Math.min(Math.max(pos.x - this.offsetLeft - parseInt(this.getElementsByTagName('div')[0].style.width) / 2,0),this.clientWidth - this.getElementsByTagName('div')[0].offsetWidth) + 'px' //left=x - this.offsetLeft - /2,Math.maxMath.min????
})

magnifier.m.mag.style.display = '';

css(magnifier.m.img,{
'top' : - (parseInt(this.getElementsByTagName('div')[0].style.top) * magnifier.m.scale) + 'px',
'left' : - (parseInt(this.getElementsByTagName('div')[0].style.left) * magnifier.m.scale) + 'px'
})

},

end:function(e){
this.getElementsByTagName('div')[0].style.display = 'none';
magnifier.removeIframe(magnifier.m.img); //iframe

magnifier.m.mag.style.display = 'none';
},

createIframe:function(elem){
var layer = document.createElement('iframe');
layer.tabIndex = '-1';
layer.src = 'javascript:false;';
elem.parentNode.appendChild(layer);

layer.style.width = elem.offsetWidth + 'px';
layer.style.height = elem.offsetHeight + 'px';
},

removeIframe:function(elem){
var layers = elem.parentNode.getElementsByTagName('iframe');
while(layers.length >0){
layers[0].parentNode.removeChild(layers[0]);
}
}
}
window.onload = function(){
magnifier.init({
cont : document.getElementById('magnifier'),
img : document.getElementById('magnifierImg'),
mag : document.getElementById('mag'),
scale : 3
});
}
</script>
</head>
<body>
<div id="magnifier">
<img src="http://www.blueidea.com/articleimg/2009/10/7087/03.jpg" id="img" />
<div id="Browser"></div>
</div>
<div id="mag"><img id="magnifierImg" /></div>
<select style="position:absolute;top:200px;left:650px;width:100px;">
<option>select</option>
<option>??</option>
</select>

IC报价网
</body>
</html>

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