<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8">
<title>焦点图 - 左右滚动</title>
<style type="text/css">
* { padding: 0; margin: 0; }
li { list-style: none; }
img { border: none; }
body { background: #ecfaff; }
.box { width: 470px; height: 150px; overflow: hidden; position: relative; margin: 150px auto 0; background: #ccc; }
.box ol { position: absolute; right: 20px; bottom: 5px; z-index: 2; }
.box ol li { float: left; margin-right: 3px; display: inline; cursor: pointer; background: #fcf2cf; border: 1px solid #f47500; padding: 2px 6px; color: #d94b01; font-family: arial; font-size: 12px; }
.box .active { padding: 3px 8px; font-weight: bold; color: #ffffff; background: #ffb442; position: relative; bottom: 2px; }
.box ul { position: absolute; top: 0; left: 0; z-index: 1; overflow:hidden; }
.box ul li { width: 470px; height: 150px; float: left; }
.box ul img { float: left; width: 470px; height: 150px; }
.box p { width: 20px; height: 20px; line-height: 20px; font-family: arial; color: #fff; text-align: center; font-weight: bold; background: #333; border: 1px solid #ccc; position: absolute; top: 60px; z-index: 2; cursor: pointer; }
.box .prev { left: 10px; }
.box .next { right: 10px; }
</style>
</head>
<body>
<div class="box" id="slider">
<ul>
<li><a href="javascript: void(0);"><img src="http://float.sinaapp.com/demo/20120213/images/img_01.jpg" alt="广告一" /></a></li>
<li><a href="javascript: void(0);"><img src="http://float.sinaapp.com/demo/20120213/images/img_02.jpg" alt="广告二" /></a></li>
<li><a href="javascript: void(0);"><img src="http://float.sinaapp.com/demo/20120213/images/img_03.jpg" alt="广告三" /></a></li>
<li><a href="javascript: void(0);"><img src="http://float.sinaapp.com/demo/20120213/images/img_04.jpg" alt="广告四" /></a></li>
<li><a href="javascript: void(0);"><img src="http://float.sinaapp.com/demo/20120213/images/img_05.jpg" alt="广告五" /></a></li>
</ul>
</div>
<script type="text/javascript">
var Effect = (function() {
var Slider = function(o) {
this.setting = typeof o === 'object' ? o : {};
this.target = this.setting.target || 'slider';
this.showMarkers = this.setting.showMarkers || false;
this.showControls = this.setting.showControls || false;
this.timer = null;
this.currentTime = null;
this.ms = 35;
this.autoMs = 3000;
this.iTarget = 0;
this.nextTarget = 0;
this.speed = 0;
this.init();
this.handleEvent();
};
Slider.prototype = {
init: function() {
this.obj = document.getElementById(this.target);
this.oUl = this.obj.getElementsByTagName('ul')[0];
this.aUlLis = this.oUl.getElementsByTagName('li');
this.width = this.aUlLis[0].offsetWidth;
this.number = this.aUlLis.length;
this.oUl.style.width = this.width * this.number + 'px';
if(this.showMarkers) {
var oDiv = document.createElement('div');
var aLis = [];
for(var i = 0; i < this.number; i++) {
aLis.push('<li>'+ (i+1) +'<\/li>');
};
oDiv.innerHTML = '<ol>'+ aLis.join('') +'<\/ol>';
this.obj.appendChild(oDiv.firstChild);
this.aLis = this.obj.getElementsByTagName('ol')[0].getElementsByTagName('li');
this.aLis[0].className = 'active';
oDiv = null;
};
if(this.showControls) {
this.oPrev = document.createElement('p');
this.oNext = document.createElement('p');
this.oPrev.className = 'prev';
this.oPrev.innerHTML = '«';
this.oNext.className = 'next';
this.oNext.innerHTML = '»';
this.obj.appendChild(this.oPrev);
this.obj.appendChild(this.oNext);
};
},
handleEvent: function() {
var that = this;
this.currentTime = setInterval(function() {
that.autoPlay();
}, this.autoMs);
this.addEvent(this.obj, 'mouseover', function() {
clearInterval(that.currentTime);
});
this.addEvent(this.obj, 'mouseout', function() {
that.currentTime = setInterval(function() {
that.autoPlay();
}, that.autoMs);
});
if(this.showMarkers) {
for(var i = 0; i < this.number; i++) {
var el = this.aLis[i];
(function(index) {
that.addEvent(el, 'mouseover', function() {
that.goTime(index);
});
})(i);
};
};
if(this.showControls) {
this.addEvent(this.oPrev, 'click', function() {
that.fnPrev();
});
this.addEvent(this.oNext, 'click', function() {
that.autoPlay();
});
};
},
addEvent: function(el, type, fn) {
if(window.addEventListener) {
el.addEventListener(type, fn, false);
}
else if(window.attachEvent) {
el.attachEvent('on' + type, fn);
};
},
fnPrev: function() {
this.nextTarget--;
if(this.nextTarget < 0) {
this.nextTarget = this.number - 1;
};
this.goTime(this.nextTarget);
},
autoPlay: function() {
this.nextTarget++;
if(this.nextTarget >= this.number) {
this.nextTarget = 0;
};
this.goTime(this.nextTarget);
},
goTime: function(index) {
var that = this;
if(this.showMarkers) {
for(var i = 0; i < this.number; i++) {
i == index ? this.aLis[i].className = 'active' : this.aLis[i].className = '';
};
};
this.iTarget = -index * this.width;
if(this.timer) {
clearInterval(this.timer);
};
this.timer = setInterval(function() {
that.doMove(that.iTarget);
}, this.ms);
},
doMove: function(target) {
this.oUl.style.left = this.speed + 'px';
this.speed += (target - this.oUl.offsetLeft) / 3;
if(Math.abs(target - this.oUl.offsetLeft) === 0) {
this.oUl.style.left = target + 'px';
clearInterval(this.timer);
this.timer = null;
};
}
};
return {
slider: function(o) {
var tt = new Slider(o);
}
};
})();
Effect.slider({
'targetElement': 'slider',
'showMarkers': true,
'showControls': true
});
</script>
</body>
</html>
