首页 > 代码库 > [JS]图片自动切换效果（学习笔记）
[JS]图片自动切换效果（学习笔记）
上次在下载的网页中看到
javascript实现图片自动切换效果：
<style text="text/css">
/*图片滚动栏*/
.container, .container * {
margin: 0;
padding: 0;
}
.container {
width: 1005px;
height: 395px;
float: right;
overflow: hidden;
position: relative;
right: 0px;
}
.container ul {
position: absolute;
}
.slider {
position: absolute;
top: 0;
left: 0;
}
.slider li {
list-style: none;
display: inline;
}
.slider img {
width: 1005px;
height: 395px;
display: block;
}
.num {
position: absolute;
right: 5px;
bottom: 5px;
}
.num li {
float: left;
color: #d71437;
text-align: center;
line-height: 16px;
width: 16px;
height: 16px;
font-family: Arial;
font-size: 12px;
cursor: pointer;
overflow: hidden;
margin: 3px 1px;
border: 1px solid #d71437;
background-color: #fff;
}
.num li.on {
color: #fff;
line-height: 21px;
width: 21px;
height: 21px;
font-size: 16px;
margin: 0 1px;
border: 0;
background-color: #d71437;
font-weight: bold;
}
</style>
<div class="container" id="idTransformView" style="float: right; overflow: hidden; position: relative;">
<ul style="position: absolute; left: 0px; top: 0px;" class="slider" id="idSlider">
<li><a href="http://www.mamicode.com/#" target="_blank"><img src="http://www.mamicode.com/images/20141011jbkggb.jpg"></a></li>
<li><a href="http://www.mamicode.com/#" target="_blank"><img src="http://www.mamicode.com/images/20141011vmtsru.jpg"></a></li>
<li><a href="http://www.mamicode.com/#" target="_blank"><img src="http://www.mamicode.com/images/20141011xsnxwp.jpg"></a></li>
<li><a href="http://www.mamicode.com/#" target="_blank"><img src="http://www.mamicode.com/images/20141011wtgoib.jpg"></a></li>
<li><a href="http://www.mamicode.com/#" target="_blank"><img src="http://www.mamicode.com/images/20141011kyzlws.jpg"></a></li>
</ul>
<ul class="num" id="idNum">
<li class="on">1</li>
<li class="">2</li>
<li class="">3</li>
<li class="">4</li>
<li class="">5</li>
</ul>
</div>
<script type="text/javascript">
var $ = function(id) {
return "string" == typeof id ? document.getElementById(id) : id;
};
var Class = {
create : function() {
return function() {
this.initialize.apply(this, arguments);
}
}
}
Object.extend = function(destination, source) {
for (var property in source) {
destination[property] = source[property];
}
return destination;
}
var TransformView = Class.create();
TransformView.prototype = {
//容器对象,滑动对象,切换参数,切换数量
initialize : function(container, slider, parameter, count, options) {
if (parameter <= 0 || count <= 0)
return;
var oContainer = $(container), oSlider = $(slider), oThis = this;
this.Index = 0;
//当前索引
this._timer = null;
//定时器
this._slider = oSlider;
//滑动对象
this._parameter = parameter;
//切换参数
this._count = count || 0;
//切换数量
this._target = 0;
//目标参数
this.SetOptions(options);
this.Up = !!this.options.Up;
this.Step = Math.abs(this.options.Step);
this.Time = Math.abs(this.options.Time);
this.Auto = !!this.options.Auto;
this.Pause = Math.abs(this.options.Pause);
this.onStart = this.options.onStart;
this.onFinish = this.options.onFinish;
oContainer.style.overflow = "hidden";
oContainer.style.position = "relative";
oSlider.style.position = "absolute";
oSlider.style.top = oSlider.style.left = 0;
},
//设置默认属性
SetOptions : function(options) {
this.options = {//默认值
Up : true, //是否向上(否则向左)
Step : 5, //滑动变化率
Time : 10, //滑动延时
Auto : true, //是否自动转换
Pause : 2000, //停顿时间(Auto为true时有效)
onStart : function() {
}, //开始转换时执行
onFinish : function() {
}//完成转换时执行
};
Object.extend(this.options, options || {});
},
//开始切换设置
Start : function() {
if (this.Index < 0) {
this.Index = this._count - 1;
} else if (this.Index >= this._count) {
this.Index = 0;
}
this._target = -1 * this._parameter * this.Index;
this.onStart();
this.Move();
},
//移动
Move : function() {
clearTimeout(this._timer);
var oThis = this, style = this.Up ? "top" : "left",
iNow = parseInt(this._slider.style[style]) || 0,
iStep = this.GetStep(this._target, iNow);
if (iStep != 0) {
this._slider.style[style] = (iNow + iStep) + "px";
this._timer = setTimeout(function() {
oThis.Move();
}, this.Time);
} else {
this._slider.style[style] = this._target + "px";
this.onFinish();
if (this.Auto) {
this._timer = setTimeout(function() {
oThis.Index++;
oThis.Start();
}, this.Pause);
}
}
},
//获取步长
GetStep : function(iTarget, iNow) {
var iStep = (iTarget - iNow) / this.Step;
if (iStep == 0)
return 0;
if (Math.abs(iStep) < 1)
return (iStep > 0 ? 1 : -1);
return iStep;
},
//停止
Stop : function(iTarget, iNow) {
clearTimeout(this._timer);
this._slider.style[this.Up ? "top" : "left"] = this._target + "px";
}
};
window.onload = function() {
function Each(list, fun) {
for (var i = 0, len = list.length; i < len; i++) {
fun(list[i], i);
}
};
var objs = $("idNum").getElementsByTagName("li");
var tv = new TransformView("idTransformView", "idSlider", 395, 5, {
onStart : function() {
Each(objs, function(o, i) {
o.className = tv.Index == i ? "on" : "";
})
}//按钮样式
});
tv.Start();
Each(objs, function(o, i) {
o.onmouseover = function() {
o.className = "on";
tv.Auto = false;
tv.Index = i;
tv.Start();
}
o.onmouseout = function() {
o.className = "";
tv.Auto = true;
tv.Start();
}
})
</script>
[JS]图片自动切换效果（学习笔记）