JavaScript 图片滑动切换效果
序一(08/07/06)
看到alibaba的一个图片切换效果,感觉不错,想拿来用用。但代码一大堆的,看着昏,还是自己来吧。
由于有了做图片滑动展示效果的经验,做这个就容易得多了。
序二(09/03/19)
自写了Tween缓动之后就很想重新写过这个效果,近来有点时间,终于可以动手了。
除了改成Tween缓动,也改进了程序算法,不过原理还是一样的。
效果预览
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仿淘宝/alibaba图片切换:
程序说明
原理就是通过不断设置滑动对象的left(水平切换)和top(垂直切换)来实现图片切换的动态效果。
首先需要一个容器,程序会自动设置容器overflow为hidden,如果不是相对或绝对定位会同时设置position为relative,
滑动对象会设置为绝对定位:
p == "relative" || p == "absolute" || (this._container.style.position = "relative");
this._container.style.overflow = "hidden";
this._slider.style.position = "absolute";
如果没有设置Change切换参数属性,会自动根据滑动对象获取:
this._slider[bVertical ? "offsetHeight" : "offsetWidth"] / this._count;
执行Run方法就会开始进入切换,其中有一个可选参数用来重新设置要切换的图片索引:
index 0 && (index = this._count - 1) || index >= this._count && (index = 0);
之后就到设置使用tween缓动时需要的参数了,
包括_target(目标值)、_t(时间)、_b(初始值)和_c(变化量):


还有Duration(持续时间)是自定义属性。
参数设置好后就执行Move程序开始移动了。
里面很简单,首先判断_c是否有值(等于0表示不需要移动)和_t是否到达Duration,
未满足条件就继续移动,否则直接移动到目标值并进行下一次切换:


使用说明
实例化需要3个参数,分别是容器对象,滑动对象和切换数量,之后可以直接执行Run方法运行:
还有以下可选属性:
Vertical: true,//是否垂直方向(方向不能改)
Auto: true,//是否自动
Change: 0,//改变量
Duration: 50,//滑动持续时间
Time: 10,//滑动延时
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
Tween: Tween.Quart.easeOut//tween算子
其中Vertical初始化后就不能修改,Tween算子可参照这里的缓动效果选择(实例中选了其中3个)。
还有提供了以下方法:
Next: 切换下一个
Previous: 切换上一个
Stop: 停止自动切换
还有上面说到的Run
程序代码


下载测试代码
其他图片展示效果:
JavaScript 图片变换效果(ie only)
JavaScript 图片滑动展示效果

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