!DOCTYPE HTMLhtmlheadmeta http-equiv="Content-Type" content="text/html; charset=utf-8"/meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0,user-scalable=no" /meta name="apple-touch-fullscre
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0,user-scalable=no" />
<meta name="apple-touch-fullscreen" content="YES" />
<meta name="apple-mobile-web-app-status-bar-style" content="black" />
<style>
body{
margin: 0;
padding: 0;
background: #333;
overflow: hidden;
}
li,ul{
list-style: none;
margin: 0;
padding: 0;
height: 100%;
overflow: hidden;
}
/* 使得图片居中 webkit-box */
li{
position: absolute;
display: -webkit-box;
-webkit-box-pack: center;
-webkit-box-align: center;
}
li img {
max-width: 100%;
max-height: 100%;
}
/* 隐藏画布外的内容 */
#canvas{
height: 100%;
width: 100%;
overflow: hidden;
}
</style>
</head>
<body>
<!-- 外层画布 -->
<div id="canvas"></div>
<script type="text/javascript">
//所有的数据
var list = [{
height: 950,
width: 800,
img: "imgs/1.jpg"
},
{
height: 1187,
width: 900,
img: "imgs/2.jpg"
},
{
height: 766,
width: 980,
img: "imgs/3.jpg"
},
{
height: 754,
width: 980,
img: "imgs/4.jpg"
},
{
height: 493,
img: "imgs/5.jpg",
width: 750
},
{
height: 500,
img: "imgs/6.jpg",
width: 750
},
{
height: 600,
img: "imgs/7.jpg",
width: 400
}];
//构造函数
function Slider(opts){
//构造函数需要的参数
this.wrap = opts.dom;
this.list = opts.list;
//构造三步奏
this.init();
this.renderDOM();
this.bindDOM();
}
//第一步 -- 初始化
Slider.prototype.init = function() {
//设定窗口比率
this.radio = window.innerHeight/window.innerWidth;
//设定一页的宽度
this.scaleW = window.innerWidth;
//设定初始的索引值
this.idx = 0;
};
//第二步 -- 根据数据渲染DOM
Slider.prototype.renderDOM = function(){
var wrap = this.wrap;
var data = this.list;
var len = data.length;
this.outer = document.createElement('ul');
//根据元素的
for(var i = 0; i < len; i++){
var li = document.createElement('li');
var item = data[i];
li.style.width = window.innerWidth +'px';
li.style.webkitTransform = 'translate3d('+ i*this.scaleW +'px, 0, 0)';
if(item){
//根据窗口的比例与图片的比例来确定
//图片是根据宽度来等比缩放还是根据高度来等比缩放
if(item['height']/item['width'] > this.radio){
li.innerHTML = '<img height="'+ window.innerHeight +'" src="'+ item['img'] +'">';
}else{
li.innerHTML = '<img width="'+ window.innerWidth +'" src="'+ item['img'] +'">';
}
}
this.outer.appendChild(li);
}
//UL的宽度和画布宽度一致
this.outer.style.cssText = 'width:' + this.scaleW +'px';
wrap.style.height = window.innerHeight + 'px';
wrap.appendChild(this.outer);
};
Slider.prototype.goIndex = function(n){
var idx = this.idx;
var lis = this.outer.getElementsByTagName('li');
var len = lis.length;
var cidx;
//如果传数字 2,3 之类可以使得直接滑动到该索引
if(typeof n == 'number'){
cidx = idx;
//如果是传字符则为索引的变化
}else if(typeof n == 'string'){
cidx = idx + n*1;
}
//当索引右超出
if(cidx > len-1){
cidx = len - 1;
//当索引左超出
}else if(cidx < 0){
cidx = 0;
}
//保留当前索引值
this.idx = cidx;
//改变过渡的方式，从无动画变为有动画
lis[cidx].style.webkitTransition = '-webkit-transform 0.2s ease-out';
lis[cidx-1] && (lis[cidx-1].style.webkitTransition = '-webkit-transform 0.2s ease-out');
lis[cidx+1] && (lis[cidx+1].style.webkitTransition = '-webkit-transform 0.2s ease-out');
//改变动画后所应该的位移值
lis[cidx].style.webkitTransform = 'translate3d(0, 0, 0)';
lis[cidx-1] && (lis[cidx-1].style.webkitTransform = 'translate3d(-'+ this.scaleW +'px, 0, 0)');
lis[cidx+1] && (lis[cidx+1].style.webkitTransform = 'translate3d('+ this.scaleW +'px, 0, 0)');
};
//第三步 -- 绑定 DOM 事件
Slider.prototype.bindDOM = function(){
var self = this;
var scaleW = self.scaleW;
var outer = self.outer;
var len = self.list.length;
//手指按下的处理事件
var startHandler = function(evt){
//记录刚刚开始按下的时间
self.startTime = new Date() * 1;
//记录手指按下的坐标
self.startX = evt.touches[0].pageX;
//清除偏移量
self.offsetX = 0;
//事件对象
var target = evt.target;
while(target.nodeName != 'LI' && target.nodeName != 'BODY'){
target = target.parentNode;
}
self.target = target;
};
//手指移动的处理事件
var moveHandler = function(evt){
//兼容chrome android，阻止浏览器默认行为
evt.preventDefault();
//计算手指的偏移量
self.offsetX = evt.targetTouches[0].pageX - self.startX;
var lis = outer.getElementsByTagName('li');
//起始索引
var i = self.idx - 1;
//结束索引
var m = i + 3;
//最小化改变DOM属性
for(i; i < m; i++){
lis[i] && (lis[i].style.webkitTransition = '-webkit-transform 0s ease-out');
lis[i] && (lis[i].style.webkitTransform = 'translate3d('+ ((i-self.idx)*self.scaleW + self.offsetX) +'px, 0, 0)');
}
};
//手指抬起的处理事件
var endHandler = function(evt){
evt.preventDefault();
//边界就翻页值
var boundary = scaleW/6;
//手指抬起的时间值
var endTime = new Date() * 1;
//所有列表项
var lis = outer.getElementsByTagName('li');
//当手指移动时间超过300ms 的时候，按位移算
if(endTime - self.startTime > 300){
if(self.offsetX >= boundary){
self.goIndex('-1');
}else if(self.offsetX < 0 && self.offsetX < -boundary){
self.goIndex('+1');
}else{
self.goIndex('0');
}
}else{
//优化
//快速移动也能使得翻页
if(self.offsetX > 50){
self.goIndex('-1');
}else if(self.offsetX < -50){
self.goIndex('+1');
}else{
self.goIndex('0');
}
}
};
//绑定事件
outer.addEventListener('touchstart', startHandler);
outer.addEventListener('touchmove', moveHandler);
outer.addEventListener('touchend', endHandler);
};
//初始化Slider 实例
new Slider({
dom : document.getElementById('canvas'),
list : list
});
</script>
</body>