JQuery 插件制作实践 xMarquee插件V1.0

<script type="text/javascript">
//<![CDATA[
$("#wk_featured_items").xMarquee({});
//]]>
</script>

; (function($) {
// Private functions.
var p = {};
p.stop = function(evt) { if (evt) { $(this).addClass(p._opts.on); }; window.clearInterval(p._intervalID); };
p.slide = function() {
if (p._opts.dir == 1) {
p._i.filter(":last").hide().fadeIn(p._opts.fadein).prependTo(p._t);
} else {
if (p._opts.vnum < p._cnt) {
p._i.filter(":first").fadeOut(p._opts.fadeout).appendTo(p._t);
p._i.filter(":eq(" + p._opts.vnum + ")").fadeIn(p._opts.fadein);
} else {
p._i.filter(":first").hide().appendTo(p._t).fadeIn(p._opts.fadein);
};
};
//refresh
p._i = $(p._opts.i, p._t);
//visibility
p._i.filter(":gt(" + (p._opts.vnum - 1) + ")").hide();
}; //slide
p.go = function(evt) {
p.stop();
if (evt) {
$(this).removeClass(p._opts.on);
};
p._intervalID = window.setInterval(function() { p.slide(); }, p._opts.interval);
}; //go
//main plugin body
$.fn.xMarquee = function(options) {
// Set the options.
options = $.extend({}, $.fn.xMarquee.defaults, options);
p._opts = options;
// Go through the matched elements and return the jQuery object.
return this.each(function() {
//NOTE:if wanna support multiple marquee instance,we should cache private variable via $(this).data("v",v)
p._t = this; //marquee target;
//silde items
p._i = $(p._opts.i, p._t);
p._cnt = p._i.size();
p._intervalID = null;
//hide unwanted items
p._i.filter(":gt(" + (p._opts.vnum - 1) + ")").hide();
p._i.hover(p.stop, p.go);
//buttons registeration
$(p._opts.btn0).click(function(evt) { p._opts.dir = 0; p.stop(); p.slide(); return false; }).mouseout(p.go);
$(p._opts.btn1).click(function(evt) { p._opts.dir = 1; p.stop(); p.slide(); return false; }).mouseout(p.go);
//trigger the slidebox
p.go();
});
};
// Public defaults.
$.fn.xMarquee.defaults = {
on: 'cur',
i: 'li', //slide items css selector
interval: 5000,
fadein: 300,
fadeout: 200,
vnum: 4, //visible marquee items
dir: 1, //marquee direaction.1=right;0=left;
btn0: '.prev', //prev button
btn1: '.next'//next button
};
})(jQuery);