我们在设计网站动画效果时经常要用到javascript，俗称js，今天长沙网站建设小编就来为大家推荐一款js制作的焦点图切换效果，这是一款基于HTML5的焦点图动画，它和其他焦点图不同的地方在于，它播放的不仅仅是图片，而是可以自定义控制的网页元素。它不仅在图片间切换有过渡动画效果，而且在切换时图片中的元素也将出现动画效果，比如图中的文字移动、打散、重新组合等，这款HTML5动画图片播放器算得上是高端大气上档次。

效果图：

HTML代码

<div class="parallax-bg" id="slider-wrap">
<div class="slider parallax-bg" id="slider">
<div class="slider-sections sandbox">&nbsp;
<section class="first">
<img alt="Kendo UI" src="images/home-banner-1.png"/>
<div class="text">
<h2>SmartSite Ver 2.2<br />智能网站管理系统 </h2>
<p class="copy">采用前后台完全分离技术，通过标签（支持标签循环嵌套、判断标签、自定义标签、文件循环嵌套等）加模板技术.全站生成纯静态页。</p>
<p class="button"><a href="#" onclick="_gaq.push(['_trackPageview', '#']);">Download</a> <a class="dimmed" onclick="_gaq.push(['_trackPageview', '#']);" href="#">Learn More</a></p>
</div>
</section>
<section>
<img src="images/dataviz-home-image-q2.png" alt="Kendo UI" />
<div class="text" style="padding-top: 10px;">
<h2>企业网站管理系统</h2>
<p class="copy">单页面、单页面索引、新闻、产品展示、下载、友情链接、网上商城，在线支付、配送、支付方式管理、广告等模块。</p>
<p class="button"><a href="#" onclick="_gaq.push(['_trackPageview', '#']);">Download</a> <a class="dimmed" onclick="_gaq.push(['_trackPageview', '#']);" href="#">Learn More</a></p>
</div>
</section>
<section>
<img src="images/home_banner_web-q2.png" alt="Kendo UI" />
<div class="text">
<h2>智能移动网站管理系统</h2>
<p class="copy">基于jquery.Mobile、HTML5技术框架，前后台完全分离，采用标签加模板技术，全站生成纯静态页。</p>
<p class="button"><a href="#" onclick="_gaq.push(['_trackPageview', '#']);">Download</a> <a class="dimmed" onclick="_gaq.push(['_trackPageview', '#']);" href="#">Learn More</a></p>
</div>
</section>
</div>
</div>
<a class="slider-prev" href="javascript: void(0)">?</a> <a class="slider-next" href="javascript: void(0)">?</a>
</div>

CSS代码：

这里列出的是这个焦点图相关的核心CSS代码。

.slider section {display: none;}
.slider section.first {display: block;}
.slider-sections, .slider-sections section {width: 861px; height: 335px;}
.slider-sections {margin: 0 auto; position: relative;}
.slider-sections section {position: absolute; top: 0; left: 0px; }
.header-content h2 
{
font:400 32px/1.2 "microsoft yahei", Tahoma, arial, sans-serif;
color: #fff;
margin: 0 0 26px;
}
.header-content p 
{
margin: 0 0 30px;
}
.header-content .centered-content
{
padding-top: 30px;
padding-bottom: 10px;
}
.button {
float: left;
width: auto !important;
list-style: none;
}
.button a,
.button button,
.button input { /* Standard black button */
font-size: 15px;
/*font-family: 'lucida sans',arial,helvetica,sans-serif;*/
line-height: 18px;
color: #fff !important;
text-decoration: none;
padding: 5px 14px 6px 13px;
display: block;
width: auto;
position: relative;
z-index: 2;
border: none;
-moz-border-radius: 3px;
border-radius: 3px;
cursor: pointer;
background: #313131; /* Old browsers */
background: -moz-linear-gradient(top, #313131 0%, #222222 100%); /* FF3.6+ */
background: -webkit-linear-gradient(top, #313131 0%,#222222 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #313131 0%,#222222 100%); /* Opera11.10+ */
background: -ms-linear-gradient(top, #313131 0%,#222222 100%); /* IE10+ */
background: linear-gradient(top, #313131 0%,#222222 100%); /* W3C */
-webkit-transition: all 0.3s ease;
-moz-transition: all 0.3s ease;
-o-transition: all 0.3s ease;
transition: all 0.3s ease;
}
.button a:hover,
.button input:hover,
.button button:hover,
.button a:focus,
.button input:focus,
.button button:focus
{
background: #464646; /* Old browsers */
background: -moz-linear-gradient(top, #464646 0%, #393939 100%); /* FF3.6+ */
background: -webkit-linear-gradient(top, #464646 0%,#393939 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #464646 0%,#393939 100%); /* Opera11.10+ */
background: -ms-linear-gradient(top, #464646 0%,#393939 100%); /* IE10+ */
background: linear-gradient(top, #464646 0%,#393939 100%); /* W3C */
}
header .header-content .button a,
#content .button a:hover
{
text-decoration: none;
}
.header-content .beta-ribbons {
position: absolute; 
height: 120px;
width: 85px;
text-indent: -200px;
overflow: hidden;
background: url(../images/kendo-ribbons.png) no-repeat 0 0;
}
.header-content .beta-ribbons.ribbon-1 {
background-position: -170px 0;
top: -3px;
right: -145px;
}
.header-content p.copy .beta-ribbons.ribbon-1 {
top: -135px;
left: 900px;
}
.header-content .beta-ribbons.ribbon-4 {
background-position: -255px 0;
left: -62px;
top: -30px;
z-index: 10;
text-indent: -2000px;
}

JavaScript代码：

下面是这个焦点图插件的代码。

/**
* @author Alexander Farkas
* v. 1.22
*/
(function ($){
if (!document.defaultView || !document.defaultView.getComputedStyle)
{ // IE6-IE8
var oldCurCSS = $.curCSS;
$.curCSS = function (elem, name, force){
if (name === 'background-position'){
name = 'backgroundPosition';
}
if (name !== 'backgroundPosition' || !elem.currentStyle || elem.currentStyle[name]){
return oldCurCSS.apply(this, arguments);
}
var style = elem.style;
if (!force && style && style[name]){
return style[name];
}
return oldCurCSS(elem, 'backgroundPositionX', force) + ' ' + oldCurCSS(elem, 'backgroundPositionY', force);
};
}
var oldAnim = $.fn.animate;
$.fn.animate = function (prop){
if ('background-position' in prop){
prop.backgroundPosition = prop['background-position'];
delete prop['background-position'];
}
if ('backgroundPosition' in prop){
prop.backgroundPosition = '(' + prop.backgroundPosition;
}
return oldAnim.apply(this, arguments);
};
function toArray(strg){
strg = strg.replace(/left|top/g, '0px');
strg = strg.replace(/right|bottom/g, '100%');
strg = strg.replace(/([0-9\.]+)(\s|\)|$)/g, "$1px$2");
var res = strg.match(/(-?[0-9\.]+)(px|\%|em|pt)\s(-?[0-9\.]+)(px|\%|em|pt)/);
return [parseFloat(res[1], 10), res[2], parseFloat(res[3], 10), res[3]];
}
$.fx.step.backgroundPosition = function (fx){
if (!fx.bgPosReady){
var start = $.curCSS(fx.elem, 'backgroundPosition');
if (!start){//FF2 no inline-style fallback
start = '0px 0px';
}
start = toArray(start);
fx.start = [start[0], start[2]];
var end = toArray(fx.end);
fx.end = [end[0], end[2]];
fx.unit = [end[1], end[3]];
fx.bgPosReady = true;
}
//return;
var nowPosX = [];
nowPosX[0] = ((fx.end[0] - fx.start[0]) * fx.pos) + fx.start[0] + fx.unit[0];
nowPosX[1] = ((fx.end[1] - fx.start[1]) * fx.pos) + fx.start[1] + fx.unit[1];
fx.elem.style.backgroundPosition = nowPosX[0] + ' ' + nowPosX[1];
};
})(jQuery);
/*
tlrkSlider
example usage:
$("#slider").tlrkSlider({
autoStart: false,
elements: {
"img": {delay: 10},
"h2": {delay: 500},
".copy": {delay: 800},
".button": {delay: 1000}
}
});
to go to a specific frame:
$("#slider").tlrkSlider("go", position);
"position" can have one of the following values:
"next", "prev", "first", "last", "+1", "-1" or a numeric value
to start/stop the automatic loop:
$("#slider").tlrkSlider("start");
$("#slider").tlrkSlider("stop");
to change the delay between automatic transitions:
$("#slider").tlrkSlider("option", "delayAnimation", 1000);
to change any option:
$("#slider").tlrkSlider("option", option_name, option_value);
Changing the "elements" object is not tested.
Changing the following options: "navigation", "navigationClass", "framesSelector", "autoStart" won't have any effect for now.
They are used only during the initialization.
$("#slider").data("tlrkSlider") will return the plugin instance and the methods/properties can be accessed from there.
 The plugin contructor defaults are accessable through TlrkSlider.defaults
 The function that actually sweep the elements in/out can be overriden from
 TlrkSlider.prototype._animationIn and TlrkSlider.prototype._animationOut
 See sweepIn/sweepOut 
 */
;(function( $, window, document, undefined ){
 // utility function that generates the "dots" navigation
function generateNavigation($el, count, config) {
var i, html = "",
width = count * 24;
html += "<ol class='" + config.navigationClass + "' style='margin-left: -" + width/2 + "px; width: " + width + "px'>";
for (i = 0; i < count; i++) {
html += "<li><a " + (i === 0 ? "class='selected'" : "" ) + " href='#" + (i) + "'>slide</a></li>";
}html += "</ol>";</pre>
<pre>$el.append(html);</pre>
<pre>}
function sweepOut($el, windowWidth) {
var dfr = $.Deferred(),
pos = $el.position(),
width = $el.width(),
delta, final,
options = $el.data("tlrkAnimOptions");
 windowWidth = windowWidth || $(window).width(); // check if the windowWidth is passed, if not - get it
 delta = windowWidth - pos.left;
 final = -(delta);
 setTimeout(function(){
$el.animate({left: final, opacity: "toggle"}, options.speed, options.easing, function(){
dfr.resolve();
});
 }, options.delay);

 return dfr.promise();
 }
 function sweepIn($el, windowWidth, frameLeft) {
 var dfr = $.Deferred(),
options = $el.data("tlrkAnimOptions"),
positionData = $el.data("tlrkOriginalPos"),
final = positionData.position.left,
rightEdge;
 windowWidth = windowWidth || $(window).width(); // check if the windowWidth is passed, if not - get it
 $el.css({opacity: 0, display: "block"}); // move it outside the right edge of the screen
 $el.css("left", function(current){
return current + windowWidth - frameLeft;
 });
 setTimeout(function(){
$el.animate({left: final, opacity: 1}, options.speed, options.easing, function(){
dfr.resolve();
});
 }, options.delay);
 return dfr.promise();
 }
 // two pass function that first iterates all the elements and gets their position/width/height
 // and then sets their position to absolute
 function absolutize($elements) {
 // todo - move it to separate function and do it just once
 // gather the original position/dimension data for all elements
 $elements.each(function(){
var $t = $(this);
if ($t.data("tlrkOriginalPos")) return
$t.data("tlrkOriginalPos", {
position: $t.position(),
width: $t.width(),
height: $t.height(),
css_pos: $t.css("position"),
css_left: $t.css("left"),
css_top: $t.css("top"),
css_width: $t.css("width") || "auto",
css_height: $t.css("height") || "auto"
});
 });
 // set the absolute position
 $elements.each(function(){
var $t = $(this),
 opos = $t.data("tlrkOriginalPos");
$t.css({
position: "absolute",
left: opos.position.left,
top: opos.position.top,
width: opos.width,
height: opos.height
});
});
}
function restoreFrameElements($elements) {
$elements.each(function(){
var $t = $(this),
opos = $t.data("tlrkOriginalPos");
if (!opos) return
$t.css({
position: opos.css_pos,
left: opos.css_left,
top: opos.css_top,
width: opos.css_width,
height: opos.css_height
});
});
}
var TlrkSlider = function( elem, options ){
this.elem = elem;
this.$elem = $(elem);
this.options = options;
};
// the plugin prototype
TlrkSlider.prototype = {
defaults: {
defaultElementOptions: {
speed: 1200,
easing: "easeInOutBack",
// interval before the element starts moving when the fadeIn/Out functions are called
// it's a good idea to give different delays for the different elements
// if all have the same delay they'll start moving all together
delay: 100 
},
// dispose elements are these that are not included in the elements object
// but affect the document flow and will be fadedIn/Out
disposeDelay: 100, // delay for the dispose elements
disposeSpeed: 1000, // how quickly they'll fadeOut/In
delayBetweenTransition: 1000, // time between starting fadeOut and fadeIn
delayAnimation: 7000, // time between auto changing the current frame
loop: true, // if true when clicking next on the last frame the slider jumps to the first one
autoStart: true, // start the automatic looping through the frames on init
framesSelector: "section", // selector for the frames inside the slider
elements: {
"p": {delay: 100, speed: 1000, easing: "easeInOutBack"}
},
navigation: true, // the dots navigation on the bottom
navigationClass: "slider-nav",
// callbacks
// another way to "catch" these events is with
// $(-slider-element-).bind("animationStart")
animationStart: null,
animationEnd: null
},
init: function() {
var c, e, element, $element,
that = this,
$firstFrame;
c = this.config = $.extend({}, this.defaults, this.options);
this.elem.style.position = "relative"; // make the wrapping element relative
// basics
this.$frames = this.$elem.find(c.framesSelector);
this.framesCount = this.$frames.length;
this.currentFrame = 0;
this.queue = [];
this._$elementsByFrame = {};
this._$disposeElementsByFrame = {};
for (i = 0; i < this.framesCount; i++) {
this._$elementsByFrame[i] = this._getFrameElements(i); // cache the $elements by frame
this._$disposeElementsByFrame[i] = this._getDisposeFrameElements(i); // cache the rest of the tree for each frame
}
if (c.navigation) {
generateNavigation(this.$elem, this.framesCount, c);
this.$navigation = this.$elem.find("."+c.navigationClass);
}
// bindings
this.$elem.find(".slider-nav").delegate("a", "click", function(e){
var frame = this.getAttribute("href").split("#")[1];
that.go.call(that, frame);
return false;
});
this.$elem // internal bindings for the callbacks
.bind("animationStart", function(){
 if ($.isFunction(c.animationStart)) {c.animationStart.apply(that, arguments);}
})
.bind("animationEnd", function(){
 if ($.isFunction(c.animationEnd)) {c.animationEnd.apply(that, arguments);}
})
;
// start animation?
if (c.autoStart) {
this.start();
} else {
this.running = false;
}
return this;
 },
start: function(instant) {
var that = this;
if (this.timer) { // we'll clear the current timer
window.clearTimeout(this.timer);
}
this.running = true;
if (instant) {
that.nextFrame();
} else {
this.timer = window.setTimeout(function(){ that.nextFrame.call(that) }, that.config.delayAnimation);
}
},
stop: function() {
if (!this.running) return; // we are not running
this.running = false;
window.clearTimeout(this.timer);
},
// main function for changing frames
selectFrame: function(frame, dfr) {
var c = this.config, // shorthand for the config
that = this,
dfr = dfr || $.Deferred(),
dFadeIn = $.Deferred(),
dFadeOut = $.Deferred();
if (isNaN(frame) || frame < 0 || frame > this.framesCount || frame === this.currentFrame) {
dfr.reject();
return dfr.promise();
}
// clear the animation loop interval if the animation is running
if (this.running && this.timer) { 
window.clearTimeout(this.timer);
}
// check if we are currenly running an animation.
if (this.animated && this.queue.length > 0) {
// wait for the last item in the queue to finish
this.queue[this.queue.length-1].done(function(){
 that.selectFrame(frame, dfr); // and call again the selectFrame
})
return dfr.promise();
}
this.animated = true;
this.$elem.trigger("animationStart", [this, frame]);
this.queue.push(dfr);
// fade the frames
dFadeOut = this._fadeOutFrame(this.currentFrame);
// hide the fadetout frame
dFadeOut.done(function(){
that.$frames.eq(that.currentFrame).hide();
});
window.setTimeout(function(){ // then wait delayBetweenTransition and fadeIn the new frame
dFadeIn = that._fadeInFrame.call(that, frame).done(function(){
// when both the fadeIn and fadeOut are done we'll resolve the selectFrame promise
$.when(dFadeOut, dFadeIn).done(function(){
that.animated = false;
that.queue.shift();
that.$elem.trigger("animationEnd", [that]);
that.currentFrame = frame;
dfr.resolve();
});
});
}, c.delayBetweenTransition);
// navigation html change
if (this.config.navigation) {
this.$navigation.find(".selected").removeClass("selected").end()
.find("a").eq(frame).addClass("selected");
}
dfr.done(function(){ // we'll resume the loop animation after the transitions are done
if (that.running) {
that.start();
}
});
return dfr.promise();
},
_fadeFrame: function(frame, callback, direction) {
var dfr = $.Deferred(),
$frame = this.$frames.eq(frame),
$elements = this._$elementsByFrame[frame],
windowWidth = $(window).width(), // cache it before the animations, so we don't have to check it for each element 
i, len,
that = this,
elementAnimations = [],
$disposeElements = this._$disposeElementsByFrame[frame],
$affectedElements,
frameLeft = $frame.offset().left;
direction = direction || "out";
if (!$.isFunction(callback)) return; // do nothing if there's no callback passed
$affectedElements = $elements.add($disposeElements);
// position absolute the animation and dispose elements
absolutize($affectedElements);
// toggle the dispose elements
if ($disposeElements.length > 0) {
window.setTimeout(function(){
 $disposeElements[direction === "out" ? "fadeOut" : "fadeIn"](that.config.disposeSpeed);
}, this.config.disposeDelay);
}
// invoke the callback for each element
// the callback must return a promise
$elements.each(function(){
elementAnimations.push( callback.call(that, $(this), windowWidth, frameLeft) );
});
// wait for all the elements to finish their animation
$.when.apply(this, elementAnimations).done(function(){
//restoreFrameElements($affectedElements); // and restore the elements' position
dfr.resolve(); // resolve the fade function
});

return dfr.promise();
 },

 _fadeOutFrame: function(frame) {
var dfr = $.Deferred(),
 $frame = this.$frames.eq(frame),
 $disposeElements = this._$disposeElementsByFrame[frame];

this._fadeFrame(frame, this._animationOut, "out").done(function(){
dfr.resolve();
})

return dfr.promise();
 },

 _fadeInFrame: function(frame) {
var dfr = $.Deferred(),
 $frame = this.$frames.eq(frame),
 $elements = this._$elementsByFrame[frame];

this._restoreFrame(frame);

$frame.show();

this._fadeFrame(frame, this._animationIn, "in").done(function(){
dfr.resolve();
});

return dfr.promise();
 },

 _restoreFrame: function(frame){
if (!frame) return
restoreFrameElements( this._$elementsByFrame[frame].add(this._$disposeElementsByFrame[frame]) );
 },

 nextFrame: function() {
var frame = this.currentFrame+1,
 dfr = $.Deferred();

if (frame > this.framesCount-1) {
if (this.config.loop) {
 frame = 0;
} else {
 dfr.reject();
}
};

this.selectFrame(frame).done(function(){
dfr.resolve();
});

return dfr.promise();
 },

 prevFrame: function() {
var frame = this.currentFrame-1,
 dfr = $.Deferred();

if (frame < 0) {
if (this.config.loop) {
 frame = this.framesCount-1;
} else {
 dfr.reject();
 return dfr.promise();
}
}

this.selectFrame(frame).done(function(){
dfr.resolve();
});

return dfr.promise();
 },

 go: function(str) { // shorthand
switch (str) {
case "next":
case "+1":
 this.nextFrame();
 break;

case "prev":
case "-1":
 this.prevFrame();
 break;

case "first":
 this.selectFrame(0);
 break;

case "last":
 this.selectFrame(this.framesCount-1);
 break;

default:
 if (isNaN(str)) return;
 this.selectFrame(Number(str));
}
 },

 // returns jquery collection of animation elements
 _getFrameElements: function(frame) { 
var $frame = this.$frames.eq(frame),
 elements = this.config.elements,
 e, elementOptions,
 $found, $frameElements = $([]);

for (e in elements) {
elementOptions = elements[e];
$found = $frame.find(e);
$found.addClass("t-frame-element").data("tlrkAnimOptions", $.extend({}, this.defaults.defaultElementOptions, elementOptions ));
$frameElements = $frameElements.add($found);
}

return $frameElements;
 },

 // returns jquery collection of elements that have to be faded out
 // i.e. elements on the same level as the animation elements
 // that doesn't contain other animation elements
 _getDisposeFrameElements: function(frame) {
var $disposeElements = $([]),
 $frame = this.$frames.eq(frame),
 $elements = this._$elementsByFrame[frame];

$elements.each(function(){
var $t = $(this),
 $siblings = $t.siblings().not(".t-frame-element");

$siblings.each(function(){
 var $t = $(this);
 // check if the node is not already marked and doesn't contains other frame elements
 if (!$t.hasClass("t-frame-dispose") && $t.find(".t-frame-element").length === 0) {
 $t.addClass("t-frame-dispose");
 $disposeElements = $disposeElements.add($t);
 }
});

});
return $disposeElements;
 },

 // expose the internal animationIn/Out functions that are called for each element in the frame
 // two arguments are passed - the $element which have to be animated and the window width
 _animationIn: sweepIn,
 _animationOut: sweepOut
 }
 TlrkSlider.defaults = TlrkSlider.prototype.defaults;
 $.fn.tlrkSlider = function(options) {
 var otherArgs = Array.prototype.slice.call(arguments, 1);
 return this.each(function() {
var $el = $(this),
 pluginData = $el.data("tlrkSlider");
if (!pluginData) { // check if the slider is already attached
pluginData = new TlrkSlider(this, options).init();
$el.data("tlrkSlider", pluginData);
return;
}
//change the options or call a method
if (typeof options === "string") {
// setting / getting option(s)
if (options === "option") {
if (typeof otherArgs[0] === "string" && typeof otherArgs[1] !== "undefined") { // set an option value
pluginData.config[otherArgs[0]] = otherArgs[1]; 
}
if (typeof otherArgs[0] === "object") { // extend the config with new options
pluginData.config = $.extend(pluginData.config, otherArgs[0]);
}
}else { // call a method?
try {
pluginData[options].apply(pluginData, otherArgs);
} catch(ex) {
throw "Error calling a plugin method (" + ex + ")";
}
}
}
});
};
window.TlrkSlider = TlrkSlider;
})( jQuery, window , document );

下面是页面调用的JS代码：

企业网站定制

$(document).ready(function(){
var $backgrounds = $(".header-content").find(".parallax-bg"),
LAYER_OFFSET = 30,
PRLX_SPEED = 1500,
$slider;
$slider = $("#slider").tlrkSlider({
autoStart: true,
animationStart: function(ev, slider, step){
var max_steps = this.framesCount; 
$backgrounds.each(function(idx, el){
var pos = (step * (100 / max_steps)) + (LAYER_OFFSET * idx);
$(this).animate({"backgroundPosition": pos + "% 0"}, PRLX_SPEED);
});
},
elements: {
"img": {delay: 10},
"h2": {delay: 500},
".copy": {delay: 800},
".button": {delay: 1000}
}
});
$(".header-content")
.hover(
function(){$(this).find(".slider-prev, .slider-next").show();},
function(){$(this).find(".slider-prev, .slider-next").hide();}
)
.find(".slider-prev").click(function(){$slider.tlrkSlider("go", "prev"); return false; }).end()
.find(".slider-next").click(function(){$slider.tlrkSlider("go", "next"); return false; });
});

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