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target3.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>轮播效果</title>
<style>
* {padding: 0; margin: 0; box-sizing: border-box;}
.banner {overflow: hidden; width: 100%; height: 300px;}
.banner .image-box {position: relative; height: 100%;}
.banner img {display: block; position: absolute; top: 0; width: 100%; height: 100%;}
</style>
</head>
<body>
<!--
生成移动端轮播图效果
要求：
1. 页面恰好显示两个图片或者显示一个图片
2. 轮播效果
可以参考虎嗅的效果
1. 首页顶端单图片轮播图，三个图片
2. 留出左右图片的边缘
3. 设置 max-width
-->
<!-- 方案来自 https://www.jb51.net/article/123303.htm -->
<div class="banner">
<div class="image-box" id="imgWrap">
<img data-index="-1" src="https://images.unsplash.com/flagged/photo-1554443877-b2ea8132bab7?ixlib=rb-1.2.1&auto=format&fit=crop&w=634&q=80">
<img data-index="0" src="https://images.unsplash.com/photo-1553531768-c3d6cfd10eeb?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=800&q=80">
<img data-index="1" src="https://images.unsplash.com/photo-1553532070-e2c5714303e6?ixlib=rb-1.2.1&auto=format&fit=crop&w=800&q=80">
<img data-index="2" src="https://images.unsplash.com/flagged/photo-1554443877-b2ea8132bab7?ixlib=rb-1.2.1&auto=format&fit=crop&w=634&q=80">
<img data-index="3" src="https://images.unsplash.com/photo-1553531768-c3d6cfd10eeb?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=800&q=80">
</div>
</div>
<script>
HTMLElement.prototype.tweenTranslateXAnimate = function (start, end, callback) {
var duration = 50;
var t = 0;
var vv = end - start;
var Tween = {
Quad: {
easeOut: function (t, b, c, d) {
return -c * (t /= d) * (t - 2) + b;
}
}
};
this.timer = setInterval(function () {
var dis = start + Tween.Quad.easeOut(++t, 0, vv, duration);
this.style.transform = 'translate3d(' + dis + 'px, 0, 0)';
if (vv > 0 && parseInt(this.style.transform.slice(12)) >= end) {
this.style.transform = 'translate3d(' + parseInt(dis) + 'px, 0, 0)';
clearInterval(this.timer);
callback && callback();
}
if (vv < 0 && parseInt(this.style.transform.slice(12)) <= end) {
this.style.transform = 'translate3d(' + parseInt(dis) + 'px, 0, 0)';
clearInterval(this.timer);
callback && callback();
}
}.bind(this), 4);
}
</script>
<script>
+function () {
var lastPX = 0; // 上一次触摸的位置x坐标, 需要计算出手指每次移动的一点点距离
var movex = 0; // 记录手指move的x方向值
var imgWrap = document.getElementById('imgWrap');
var startX = 0; // 开始触摸时手指所在x坐标
var endX = 0; // 触摸结束时手指所在的x坐标位置
var imgSize = imgWrap.children.length - 2; // 图片个数
var t1 = 0; // 记录开始触摸的时刻
var t2 = 0; // 拖动间隔时间
var width = window.innerWidth; // 当前窗口宽度
var nodeList = document.querySelectorAll('#imgWrap img'); // 所有轮播图节点数组 NodeList
// 给图片设置合适的left值, 注意 querySelectorAll返回 NodeList, 具有 forEach方法
nodeList.forEach(function (node, index) {
node.style.left = (index - 1) * width + 'px';
});
/**
* 移动图片到当前的 tIndex 索引所在位置
* @param {number} tIndex 要显示的图片的索引
* */
function toIndex(tIndex) {
var dis = -(tIndex * width);
var start = parseInt(imgWrap.style.transform.slice(12));
// 动画移动
imgWrap.tweenTranslateXAnimate(start, dis, function () {
setTimeout(function () {
movex = dis;
if (tIndex === imgSize) {
imgWrap.style.transform = 'translate3d(0, 0, 0)';
movex = 0;
}
if (tIndex === -1) {
imgWrap.style.transform = 'translate3d(' + width * (1 - imgSize) + 'px, 0, 0)';
movex = -width * (imgSize - 1);
}
}, 0);
});
}
/**
* 处理各种触摸事件 ,包括 touchstart, touchend, touchmove, touchcancel
* @param {Event} evt 回调函数中系统传回的 js 事件对象
* */
function touch(evt) {
var touch = evt.targetTouches[0];
var tar = evt.target;
var index = parseInt(tar.getAttribute('data-index'));
if (evt.type === 'touchmove') {
var di = parseInt(touch.pageX - lastPX);
endX = touch.pageX;
movex += di;
imgWrap.style.webkitTransform = 'translate3d(' + movex + 'px, 0, 0)';
lastPX = touch.pageX;
}
else if (evt.type === 'touchend') {
var minus = endX - startX;
t2 = new Date().getTime() - t1;
if (Math.abs(minus) > 0) { // 有拖动操作
if (Math.abs(minus) < width * 0.4 && t2 > 500) { // 拖动距离不够,返回!
toIndex(index);
} else { // 超过一半,看方向
console.log(minus);
if (Math.abs(minus) < 20) {
console.log('距离很短' + minus);
toIndex(index);
return;
}
if (minus < 0) { // endX < startX,向左滑动,是下一张
toIndex(index + 1)
} else { // endX > startX ,向右滑动, 是上一张
toIndex(index - 1)
}
}
} else { //没有拖动操作
}
}
else if (evt.type === 'touchstart') {
lastPX = touch.pageX;
startX = lastPX;
endX = startX;
t1 = new Date().getTime();
}
return false;
}
imgWrap.addEventListener('touchstart', touch, false);
imgWrap.addEventListener('touchmove', touch, false);
imgWrap.addEventListener('touchend', touch, false);
imgWrap.addEventListener('touchcancel', touch, false);
}();
</script>
</body>
</html>