下图只是给大家举个例子，类似于这种效果图：
具体实现过程请看下文代码：
css
js
0) ? el.title : el.imagetitle;
var smallimage = new Smallimage(img);
var lens = new Lens();
var stage = new Stage();
var largeimage = new Largeimage();
var loader = new Loader();
//preventing default click,allowing the onclick event [exmple: lightBox]
$(el).bind('click',function (e) {
e.preventDefault();
return false;
});
//setting the default zoomType if not in settings
var zoomtypes = ['standard','drag','innerzoom','reverse'];
if ($.inArray($.trim(settings.zoomType),zoomtypes) < 0) {
settings.zoomType = 'standard';
}
$.extend(obj,{
create: function () { //create the main objects
//create ZoomPad
if ($(".zoomPad",el).length == 0) {
el.zoomPad = $('').addClass('zoomPad');
img.wrap(el.zoomPad);
}
if(settings.zoomType == 'innerzoom'){
settings.zoomWidth = smallimage.w;
settings.zoomHeight = smallimage.h;
}
//creating ZoomPup
if ($(".zoomPup",el).length == 0) {
lens.append();
}
//creating zoomWindow
if ($(".zoomWindow",el).length == 0) {
stage.append();
}
//creating Preload
if ($(".zoomPreload",el).length == 0) {
loader.append();
}
//preloading images
if (settings.preloadImages || settings.zoomType == 'drag' || settings.alwaysOn) {
obj.load();
}
obj.init();
},init: function () {
//drag option
if (settings.zoomType == 'drag') {
$(".zoomPad",el).mousedown(function () {
el.mouseDown = true;
});
$(".zoomPad",el).mouseup(function () {
el.mouseDown = false;
});
document.body.ondragstart = function () {
return false;
};
$(".zoomPad",el).css({
cursor: 'default'
});
$(".zoomPup",el).css({
cursor: 'move'
});
}
if (settings.zoomType == 'innerzoom') {
$(".zoomWrapper",el).css({
cursor: 'crosshair'
});
}
$(".zoomPad",el).bind('mouseenter mouSEOver',function (event) {
img.attr('title','');
$(el).attr('title','');
el.zoom_active = true;
//if loaded then activate else load large image
smallimage.fetchdata();
if (el.largeimageloaded) {
obj.activate(event);
} else {
obj.load();
}
});
$(".zoomPad",el).bind('mouseleave',function (event) {
obj.deactivate();
});
$(".zoomPad",el).bind('mousemove',function (e) {
//prevent fast mouse mevements not to fire the mouSEOut event
if (e.pageX > smallimage.pos.r || e.pageX < smallimage.pos.l || e.pageY < smallimage.pos.t || e.pageY > smallimage.pos.b) {
lens.setcenter();
return false;
}
el.zoom_active = true;
if (el.largeimageloaded && !$('.zoomWindow',el).is(':visible')) {
obj.activate(e);
}
if (el.largeimageloaded && (settings.zoomType != 'drag' || (settings.zoomType == 'drag' && el.mouseDown))) {
lens.setposition(e);
}
});
var thumb_preload = new Array();
var i = 0;
//binding click event on thumbnails
var thumblist = new Array();
thumblist = $('a').filter(function () {
var regex = new RegExp("gallery[\\s]*:[\\s]*'" + $.trim(el.rel) + "'","i");
var rel = $(this).attr('rel');
if (regex.test(rel)) {
return this;
}
});
if (thumblist.length > 0) {
//getting the first to the last
var first = thumblist.splice(0,1);
thumblist.push(first);
}
thumblist.each(function () {
//preloading thumbs
if (settings.preloadImages) {
var thumb_options = $.extend({},eval("(" + $.trim($(this).attr('rel')) + ")"));
thumb_preload[i] = new Image();
thumb_preload[i].src = thumb_options.largeimage;
i++;
}
$(this).click(function (e) {
if($(this).hasClass('zoomThumbActive')){
return false;
}
thumblist.each(function () {
$(this).removeClass('zoomThumbActive');
});
e.preventDefault();
obj.swapimage(this);
return false;
});
});
},load: function () {
if (el.largeimageloaded == false && el.largeimageloading == false) {
var url = $(el).attr('href');
el.largeimageloading = true;
largeimage.loadimage(url);
}
},activate: function (e) {
clearTimeout(el.timer);
//show lens and zoomWindow
lens.show();
stage.show();
},deactivate: function (e) {
switch (settings.zoomType) {
case 'drag':
//nothing or lens.setcenter();
break;
default:
img.attr('title',el.imagetitle);
$(el).attr('title',el.title);
if (settings.alwaysOn) {
lens.setcenter();
} else {
stage.hide();
lens.hide();
}
break;
}
el.zoom_active = false;
},swapimage: function (link) {
el.largeimageloading = false;
el.largeimageloaded = false;
var options = new Object();
options = $.extend({},eval("(" + $.trim($(link).attr('rel')) + ")"));
if (options.smallimage && options.largeimage) {
var smallimage = options.smallimage;
var largeimage = options.largeimage;
$(link).addClass('zoomThumbActive');
$(el).attr('href',largeimage);
img.attr('src',smallimage);
lens.hide();
stage.hide();
obj.load();
} else {
alert('ERROR :: Missing parameter for largeimage or smallimage.');
throw 'ERROR :: Missing parameter for largeimage or smallimage.';
}
return false;
}
});
//sometimes image is already loaded and onload will not fire
if (img[0].complete) {
//fetching data from sallimage if was prevIoUsly loaded
smallimage.fetchdata();
if ($(".zoomPad",el).length == 0) obj.create();
}
/*========================================================,| Smallimage
|---------------------------------------------------------:
| Base image into the anchor element
`========================================================*/
function Smallimage(image) {
var $obj = this;
this.node = image[0];
this.findborder = function () {
var bordertop = 0;
bordertop = image.css('border-top-width');
btop = '';
var borderleft = 0;
borderleft = image.css('border-left-width');
bleft = '';
if (bordertop) {
for (i = 0; i < 3; i++) {
var x = [];
x = bordertop.substr(i,1);
if (isNaN(x) == false) {
btop = btop + '' + bordertop.substr(i,1);
} else {
break;
}
}
}
if (borderleft) {
for (i = 0; i < 3; i++) {
if (!isNaN(borderleft.substr(i,1))) {
bleft = bleft + borderleft.substr(i,1)
} else {
break;
}
}
}
$obj.btop = (btop.length > 0) ? eval(btop) : 0;
$obj.bleft = (bleft.length > 0) ? eval(bleft) : 0;
};
this.fetchdata = function () {
$obj.findborder();
$obj.w = image.width();
$obj.h = image.height();
$obj.ow = image.outerWidth();
$obj.oh = image.outerHeight();
$obj.pos = image.offset();
$obj.pos.l = image.offset().left + $obj.bleft;
$obj.pos.t = image.offset().top + $obj.btop;
$obj.pos.r = $obj.w + $obj.pos.l;
$obj.pos.b = $obj.h + $obj.pos.t;
$obj.rightlimit = image.offset().left + $obj.ow;
$obj.bottomlimit = image.offset().top + $obj.oh;
};
this.node.onerror = function () {
alert('Problems while loading image.');
throw 'Problems while loading image.';
};
this.node.onload = function () {
$obj.fetchdata();
if ($(".zoomPad",el).length == 0) obj.create();
};
return $obj;
};
/*========================================================,| Loader
|---------------------------------------------------------:
| Show that the large image is loading
`========================================================*/
function Loader() {
var $obj = this;
this.append = function () {
this.node = $('').addClass('zoomPreload').css('visibility','hidden').html(settings.preloadText);
$('.zoomPad',el).append(this.node);
};
this.show = function () {
this.node.top = (smallimage.oh - this.node.height()) / 2;
this.node.left = (smallimage.ow - this.node.width()) / 2;
//setting position
this.node.css({
top: this.node.top,left: this.node.left,position: 'absolute',visibility: 'visible'
});
};
this.hide = function () {
this.node.css('visibility','hidden');
};
return this;
}
/*========================================================,| Lens
|---------------------------------------------------------:
| Lens over the image
`========================================================*/
function Lens() {
var $obj = this;
this.node = $('').addClass('zoomPup');
//this.nodeimgwrapper = $("").addClass('zoomPupImgWrapper');
this.append = function () {
$('.zoomPad',el).append($(this.node).hide());
if (settings.zoomType == 'reverse') {
this.image = new Image();
this.image.src = smallimage.node.src; // fires off async
$(this.node).empty().append(this.image);
}
};
this.setdimensions = function () {
this.node.w = (parseInt((settings.zoomWidth) / el.scale.x) > smallimage.w ) ? smallimage.w : (parseInt(settings.zoomWidth / el.scale.x));
this.node.h = (parseInt((settings.zoomHeight) / el.scale.y) > smallimage.h ) ? smallimage.h : (parseInt(settings.zoomHeight / el.scale.y));
this.node.top = (smallimage.oh - this.node.h - 2) / 2;
this.node.left = (smallimage.ow - this.node.w - 2) / 2;
//centering lens
this.node.css({
top: 0,left: 0,width: this.node.w + 'px',height: this.node.h + 'px',display: 'none',borderWidth: 1 + 'px'
});
if (settings.zoomType == 'reverse') {
this.image.src = smallimage.node.src;
$(this.node).css({
'opacity': 1
});
$(this.image).css({
position: 'absolute',display: 'block',left: -(this.node.left + 1 - smallimage.bleft) + 'px',top: -(this.node.top + 1 - smallimage.btop) + 'px'
});
}
};
this.setcenter = function () {
//calculating center position
this.node.top = (smallimage.oh - this.node.h - 2) / 2;
this.node.left = (smallimage.ow - this.node.w - 2) / 2;
//centering lens
this.node.css({
top: this.node.top,left: this.node.left
});
if (settings.zoomType == 'reverse') {
$(this.image).css({
position: 'absolute',top: -(this.node.top + 1 - smallimage.btop) + 'px'
});
}
//centering large image
largeimage.setposition();
};
this.setposition = function (e) {
el.mousepos.x = e.pageX;
el.mousepos.y = e.pageY;
var lensleft = 0;
var lenstop = 0;
function overleft(lens) {
return el.mousepos.x - (lens.w) / 2 < smallimage.pos.l;
}
function overright(lens) {
return el.mousepos.x + (lens.w) / 2 > smallimage.pos.r;
}
function overtop(lens) {
return el.mousepos.y - (lens.h) / 2 < smallimage.pos.t;
}
function overbottom(lens) {
return el.mousepos.y + (lens.h) / 2 > smallimage.pos.b;
}
lensleft = el.mousepos.x + smallimage.bleft - smallimage.pos.l - (this.node.w + 2) / 2;
lenstop = el.mousepos.y + smallimage.btop - smallimage.pos.t - (this.node.h + 2) / 2;
if (overleft(this.node)) {
lensleft = smallimage.bleft - 1;
} else if (overright(this.node)) {
lensleft = smallimage.w + smallimage.bleft - this.node.w - 1;
}
if (overtop(this.node)) {
lenstop = smallimage.btop - 1;
} else if (overbottom(this.node)) {
lenstop = smallimage.h + smallimage.btop - this.node.h - 1;
}
this.node.left = lensleft;
this.node.top = lenstop;
this.node.css({
'left': lensleft + 'px','top': lenstop + 'px'
});
if (settings.zoomType == 'reverse') {
if ($.browser.msie && $.browser.version > 7) {
$(this.node).empty().append(this.image);
}
$(this.image).css({
position: 'absolute',top: -(this.node.top + 1 - smallimage.btop) + 'px'
});
}
largeimage.setposition();
};
this.hide = function () {
img.css({
'opacity': 1
});
this.node.hide();
};
this.show = function () {
if (settings.zoomType != 'innerzoom' && (settings.lens || settings.zoomType == 'drag')) {
this.node.show();
}
if (settings.zoomType == 'reverse') {
img.css({
'opacity': settings.imageOpacity
});
}
};
this.getoffset = function () {
var o = {};
o.left = $obj.node.left;
o.top = $obj.node.top;
return o;
};
return this;
};
/*========================================================,| Stage
|---------------------------------------------------------:
| Window area that contains the large image
`========================================================*/
function Stage() {
var $obj = this;
this.node = $("");
this.ieframe = $('');
this.setposition = function () {
this.node.leftpos = 0;
this.node.toppos = 0;
if (settings.zoomType != 'innerzoom') {
//positioning
switch (settings.position) {
case "left":
this.node.leftpos = (smallimage.pos.l - smallimage.bleft - Math.abs(settings.xOffset) - settings.zoomWidth > 0) ? (0 - settings.zoomWidth - Math.abs(settings.xOffset)) : (smallimage.ow + Math.abs(settings.xOffset));
this.node.toppos = Math.abs(settings.yOffset);
break;
case "top":
this.node.leftpos = Math.abs(settings.xOffset);
this.node.toppos = (smallimage.pos.t - smallimage.btop - Math.abs(settings.yOffset) - settings.zoomHeight > 0) ? (0 - settings.zoomHeight - Math.abs(settings.yOffset)) : (smallimage.oh + Math.abs(settings.yOffset));
break;
case "bottom":
this.node.leftpos = Math.abs(settings.xOffset);
this.node.toppos = (smallimage.pos.t - smallimage.btop + smallimage.oh + Math.abs(settings.yOffset) + settings.zoomHeight < screen.height) ? (smallimage.oh + Math.abs(settings.yOffset)) : (0 - settings.zoomHeight - Math.abs(settings.yOffset));
break;
default:
this.node.leftpos = (smallimage.rightlimit + Math.abs(settings.xOffset) + settings.zoomWidth < screen.width) ? (smallimage.ow + Math.abs(settings.xOffset)) : (0 - settings.zoomWidth - Math.abs(settings.xOffset));
this.node.toppos = Math.abs(settings.yOffset);
break;
}
}
this.node.css({
'left': this.node.leftpos + 'px','top': this.node.toppos + 'px'
});
return this;
};
this.append = function () {
$('.zoomPad',el).append(this.node);
this.node.css({
position: 'absolute',zIndex: 5001
});
if (settings.zoomType == 'innerzoom') {
this.node.css({
cursor: 'default'
});
var thickness = (smallimage.bleft == 0) ? 1 : smallimage.bleft;
$('.zoomWrapper',this.node).css({
borderWidth: thickness + 'px'
});
}
$('.zoomWrapper',this.node).css({
width: Math.round(settings.zoomWidth) + 'px',borderWidth: thickness + 'px'
});
$('.zoomWrapperImage',this.node).css({
width: '100%',height: Math.round(settings.zoomHeight) + 'px'
});
//zoom title
$('.zoomWrapperTitle',position: 'absolute'
});
$('.zoomWrapperTitle',this.node).hide();
if (settings.title && zoomtitle.length > 0) {
$('.zoomWrapperTitle',this.node).html(zoomtitle).show();
}
$obj.setposition();
};
this.hide = function () {
switch (settings.hideEffect) {
case 'fadeout':
this.node.fadeOut(settings.fadeoutSpeed,function () {});
break;
default:
this.node.hide();
break;
}
this.ieframe.hide();
};
this.show = function () {
switch (settings.showEffect) {
case 'fadein':
this.node.fadeIn();
this.node.fadeIn(settings.fadeinSpeed,function () {});
break;
default:
this.node.show();
break;
}
if (isIE6 && settings.zoomType != 'innerzoom') {
this.ieframe.width = this.node.width();
this.ieframe.height = this.node.height();
this.ieframe.left = this.node.leftpos;
this.ieframe.top = this.node.toppos;
this.ieframe.css({
display: 'block',position: "absolute",left: this.ieframe.left,top: this.ieframe.top,zIndex: 99,width: this.ieframe.width + 'px',height: this.ieframe.height + 'px'
});
$('.zoomPad',el).append(this.ieframe);
this.ieframe.show();
};
};
};
/*========================================================,| LargeImage
|---------------------------------------------------------:
| The large detailed image
`========================================================*/
function Largeimage() {
var $obj = this;
this.node = new Image();
this.loadimage = function (url) {
//showing preload
loader.show();
this.url = url;
this.node.style.position = 'absolute';
this.node.style.border = '0px';
this.node.style.display = 'none';
this.node.style.left = '-5000px';
this.node.style.top = '0px';
document.body.appendChild(this.node);
this.node.src = url; // fires off async
};
this.fetchdata = function () {
var image = $(this.node);
var scale = {};
this.node.style.display = 'block';
$obj.w = image.width();
$obj.h = image.height();
$obj.pos = image.offset();
$obj.pos.l = image.offset().left;
$obj.pos.t = image.offset().top;
$obj.pos.r = $obj.w + $obj.pos.l;
$obj.pos.b = $obj.h + $obj.pos.t;
scale.x = ($obj.w / smallimage.w);
scale.y = ($obj.h / smallimage.h);
el.scale = scale;
document.body.removeChild(this.node);
$('.zoomWrapperImage',el).empty().append(this.node);
//setting lens dimensions;
lens.setdimensions();
};
this.node.onerror = function () {
alert('Problems while loading the big image.');
throw 'Problems while loading the big image.';
};
this.node.onload = function () {
//fetching data
$obj.fetchdata();
loader.hide();
el.largeimageloading = false;
el.largeimageloaded = true;
if (settings.zoomType == 'drag' || settings.alwaysOn) {
lens.show();
stage.show();
lens.setcenter();
}
};
this.setposition = function () {
var left = -el.scale.x * (lens.getoffset().left - smallimage.bleft + 1);
var top = -el.scale.y * (lens.getoffset().top - smallimage.btop + 1);
$(this.node).css({
'left': left + 'px','top': top + 'px'
});
};
return this;
};
$(el).data("jqzoom",obj);
};
//es. $.jqzoom.disable('#jqzoom1');
$.jqzoom = {
defaults: {
zoomType: 'standard',//innerzoom/standard/reverse/drag
zoomWidth: 300,//zoomWindow default width
zoomHeight: 300,//zoomWindow default height
xOffset: 10,//zoomWindow x offset,can be negative(more on the left) or positive(more on the right)
yOffset: 0,//zoomWindow y offset,can be negative(more on the left) or positive(more on the right)
position: "right",//zoomWindow default position
preloadImages: true,//image preload
preloadText: 'Loading zoom',title: true,lens: true,imageOpacity: 0.4,alwaysOn: false,showEffect: 'show',//show/fadein
hideEffect: 'hide',//hide/fadeout
fadeinSpeed: 'slow',//fast/slow/number
fadeoutSpeed: '2000' //fast/slow/number
},disable: function (el) {
var api = $(el).data('jqzoom');
api.disable();
return false;
},enable: function (el) {
var api = $(el).data('jqzoom');
api.enable();
return false;
},disableAll: function (el) {
jqzoompluging_disabled = true;
},enableAll: function (el) {
jqzoompluging_disabled = false;
}
};
})(jQuery);
还需要有Jquery.js
使用方法：
1.当页面导入的时候，载入 jQZoom 插件。
2.创建一个放图片的容器，指定一个a标记用于显示放大后的图片的一部分：
下面给一些基本的配置参数：
•zoomType，默认值：'standard'，另一个值是'reverse'，是否将原图用半透明图层遮盖。
•zoomWidth，默认值：200，放大窗口的宽度。
•zoomHeight，默认值：200，放大窗口的高度。
•xOffset，默认值：10，放大窗口相对于原图的x轴偏移值，可以为负。
•yOffset，默认值：0，放大窗口相对于原图的y轴偏移值，可以为负。
•position，默认值：'right'，放大窗口的位置，值还可以是:'right','left','top','bottom'。
•lens，默认值：true，若为false，则不在原图上显示镜头。
•imageOpacity，默认值：0.2，当zoomType的值为'reverse'时，这个参数用于指定遮罩的透明度。
•title，默认值：true，在放大窗口中显示标题，值可以为a标记的title值，若无，则为原图的title值。
•showEffect，默认值：'show'，显示放大窗口时的效果，值可以为: ‘show','fadein'。
•hideEffect，默认值：'hide'，隐藏放大窗口时的效果: ‘hide','fadeout'。
•fadeinSpeed，默认值：'fast'，放大窗口的渐显速度(选项: ‘fast','slow','medium')。
•fadeoutSpeed，默认值：'slow'，放大窗口的渐隐速度(选项: ‘fast','medium')。
•showPreload，默认值：true，是否显示加载提示Loading zoom(选项: ‘true','false')。
•preloadText，默认值：'Loading zoom'，自定义加载提示文本。
•preloadPosition，默认值：'center'，加载提示的位置，值也可以为'bycss'，以通过css指定位置。
原文链接：https://www.f2er.com/jquery/49661.html