1）上下滚动回弹
function swipe(){
//需求：
//1、获取要滚动的ul及ul的父级
var ulFather = document.querySelector(‘.container‘);
var ul = ul.querySelector(‘ul‘);
//2、获取滚动正常范围
var startY =0 ;
var moveY =0 ;
//滚动的距离
var dist = 0 ;
//当前ul滚动位置
var curDisY = 0 ;
//向下滚动时正常范围
var normalScrollDown = 0 ;
//向上滚动时正常范围
var normalScrollUp = left.offsetHeight - ul.offsetHeight;
//向下滚动时最大范围
var maxScrollDown = 100 + normalScrollDown ;
//向上滚动时最大范围
var maxScrollUp = normalScrollUp -100;
left.addEventListener(‘touchstart‘,function(e){
startY = e.touches[0].clientY;
})
left.addEventListener(‘touchmove‘,function(e){
moveY = e.touches[0].clientY;
distY = moveY - startY;
//如果当前滚动位置在最大的滚动范围内，允许滚动
if(curDistY + distY < maxScrollDown && curDistY + distY > maxScrollUp){
//正常范围内无动效
ul.style.transition = "none" ;
ul.style.transform = "translateY("+(disY+curDisY)+“px)";
}
})
left.addEventListener(‘touchend‘,function(e){
//记录当前ul的滚动位置
curDistY = curDistY + distY ;
//如果当前滚动位置超过范围则设置正常范围
if(curDistY > normalScrollDown){
curDistY = normalScrollDown;
//增加动画效果
ul.style.transition = "all 0.4s";
ul.style.transform = "translateY("+(curDisY)+“px)";
}
if(curDistY < normalScrollUp){
curDistY = normalScrollUp;
ul.style.transition = "all 0.4s";
ul.style.transform = "translateY("+(curDisY)+“px)";
}
})
}
*****************************************************************************************
使用面向对象封装一个上下回滚的函数
/**
* Created by zhousg on 2016/3/18.
*/
/**
* @author zhousg
* @Date 2016-02-04
* @Method 滑动方法 针对一个大容器内部的容器做滑动封装
* @param args args.swipeDom 大容器对象 args.swipeType 滑动类型 args.swipeDistance 缓冲距离
* 注意：子容器的高宽度是取的内容的高宽 所以padding的大小有影响
*/
if(!window.itcast){
window.itcast = {};
}
itcast.iScroll = function(args){
/*调用的时候没有初始化的话就是初始化一次*/
if(!(this instanceof arguments.callee)) return new arguments.callee(args);
this.init(args);
};
itcast.iScroll.prototype = {
constructor:itcast.iScroll,
init:function(args){
/*局部变量来接受当前的this*/
var that = this;
/*如果传入的对象是一个Dom对象就把他看作是我们的大容器盒子*/
if(args.swipeDom && typeof args.swipeDom == ‘object‘){
that.parentDom = args.swipeDom;
}
/*如果不存在父容器就停止初始化*/
if(!that.parentDom) return false;
/*找到子容器*/
that.childDom = that.parentDom.children&&that.parentDom.children[0]?that.parentDom.children[0]:‘‘;
/*如果不存在子容器就停止初始化*/
if(!that.childDom) return false;
/*初始化传入的参数*/
that.settings = {};
/*默认类型 默认的Y轴滑动 如果不是y的话就是以x轴开始滑动*/
that.settings.swipeType = args.swipeType?args.swipeType:‘y‘;
/*默认的缓冲滑动距离*/
that.settings.swipeDistance = args.swipeDistance>=0?args.swipeDistance:150;
/*初始化滑动*/
that._scroll();
},
/*对外开放的设置定位的方法*/
setTranslate:function(translate){
this.currPostion = translate;
this._addTransition();
this._changeTranslate(this.currPostion);
},
_addTransition:function(){
this.childDom.style.transition = "all .2s ease";
this.childDom.style.webkitTransition = "all .2s ease";/*兼容 老版本webkit内核浏览器*/
},
_removeTransition:function(){
this.childDom.style.transition = "none";
this.childDom.style.webkitTransition = "none";/*兼容 老版本webkit内核浏览器*/
},
_changeTranslate:function(translate){
if(this.settings.swipeType == ‘y‘){
this.childDom.style.transform = "translateY("+translate+"px)";
this.childDom.style.webkitTransform = "translateY("+translate+"px)";
}else{
this.childDom.style.transform = "translateX("+translate+"px)";
this.childDom.style.webkitTransform = "translateX("+translate+"px)";
}
},
_scroll:function(){
/*局部变量来接受当前的this*/
var that = this;
/*滑动的类型*/
var type = that.settings.swipeType == ‘y‘?true:false;
/*父容器的高度或宽度*/
var parentHeight = type?that.parentDom.offsetHeight:that.parentDom.offsetWidth;
/*子容器的高度或宽度*/
var childHeight = type?that.childDom.offsetHeight:that.childDom.offsetWidth;
/*子容器没有父容器大的时候*/
if(childHeight < parentHeight){
if(type){
that.childDom.style.height = parentHeight + ‘px‘;
childHeight = parentHeight;
}else{
that.childDom.style.width = parentHeight + ‘px‘;
childHeight = parentHeight;
}
}
/*缓冲距离*/
var distance = that.settings.swipeDistance;
/*区间*/
/*左侧盒子定位的区间*/
that.maxPostion = 0;
that.minPostion = -(childHeight-parentHeight);
/*设置滑动的当前位置*/
that.currPostion = 0;
that.startPostion = 0;
that.endPostion = 0;
that.movePostion = 0;
/*1.滑动*/
that.childDom.addEventListener(‘touchstart‘,function(e){
/*初始的Y的坐标*/
that.startPostion = type?e.touches[0].clientY: e.touches[0].clientX;
},false);
that.childDom.addEventListener(‘touchmove‘,function(e){
e.preventDefault();
/*不停的做滑动的时候记录的endY的值*/
that.endPostion = type?e.touches[0].clientY: e.touches[0].clientX;
that.movePostion = that.startPostion - that.endPostion;/*计算了移动的距离*/
/*2.滑动区间*/
/*就是滑动区间*/
if((that.currPostion-that.movePostion)<(that.maxPostion+distance)
&&
(that.currPostion-that.movePostion)>(that.minPostion -distance)){
that._removeTransition();
that._changeTranslate(that.currPostion-that.movePostion);
}
},false);
window.addEventListener(‘touchend‘,function(e){
/*在限制滑动区间之后 重新计算当前定位*/
/*判断是否在我们的合理定位区间内*/
/*先向下滑动 */
if((that.currPostion-that.movePostion) > that.maxPostion){
that.currPostion = that.maxPostion;
that._addTransition();
that._changeTranslate(that.currPostion);
}
/*想上滑动的时候*/
else if((that.currPostion-that.movePostion) < that.minPostion){
that.currPostion = that.minPostion;
that._addTransition();
that._changeTranslate(that.currPostion);
}
/*正常的情况*/
else{
that.currPostion = that.currPostion-that.movePostion;
}
that._reset();
},false);
},
_reset:function(){
var that = this;
that.startPostion = 0;
that.endPostion = 0;
that.movePostion = 0;
}
};
如何使用：
1、先引入
2、调用
itcast.isScroll({
//获取滚动元素的父级
swipeDom: document.querySelector(‘.content‘),
//如果是横向滚动 x,纵向滚动 y
swipeType:‘y‘,
//回弹距离
swipeDistance: 100
})
*****************************************************************************************
2） 封装移动端点击事件
因为click事件在移动端有300ms的延迟
需求：
1、事件的发生时间要在150ms以内
2、没有触发 touchmove 事件
function tap(dom,callback){
var isMove = false;
var startTime = 0 ;
dom.addEventListener(‘touchstart‘,function(){
//返回当前事件的毫秒数
startTime = Date.now();
})
dom.addEventListener(‘touchmove‘,function(){
isMove = true;
})
dom.addEventListener(‘touchend‘,function(){
if(!isMove && Date.now()-startTime < 150){
callback && callback();
}
isMove= false;
startTime = 0;
})
}
