(function(){
window.requestAnimationFrame = window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame;
window.cancelAnimationFrame = window.cancelAnimationFrame|| window.webkitCancelAnimationFrame || window.mozCancelAnimationFrame||window.cancelRequestAnimationFrame||window.webkitCancelRequestAnimationFrame||window.mozCancelRequestAnimationFrame;
if(!requestAnimationFrame){
var lastTime = Date.now();
window.requestAnimationFrame = function(callback){
var id;
var nowTime = Date.now();
var delay = Math.max(16.7-(nowTime-lastTime),0);
id = setTimeout(callback,delay);
lastTime = nowTime + delay;
return id;
};
}
if(!cancelAnimationFrame){
window.cancelAnimationFrame = function(index){
clearTimeout(index);
};
}
})();
var Tween = {
linear: function (t, b, c, d){
return c*t/d + b;
},
easeIn: function(t, b, c, d){
return c*(t/=d)*t + b;
},
easeOut: function(t, b, c, d){
return -c *(t/=d)*(t-2) + b;
},
easeBoth: function(t, b, c, d){
if ((t/=d/2) < 1) {
return c/2*t*t + b;
}
return -c/2 * ((--t)*(t-2) - 1) + b;
},
easeInStrong: function(t, b, c, d){
return c*(t/=d)*t*t*t + b;
},
easeOutStrong: function(t, b, c, d){
return -c * ((t=t/d-1)*t*t*t - 1) + b;
},
easeBothStrong: function(t, b, c, d){
if ((t/=d/2) < 1) {
return c/2*t*t*t*t + b;
}
return -c/2 * ((t-=2)*t*t*t - 2) + b;
},
elasticIn: function(t, b, c, d, a, p){
if (t === 0) {
return b;
}
if ( (t /= d) == 1 ) {
return b+c;
}
if (!p) {
p=d*0.3;
}
if (!a || a < Math.abs(c)) {
a = c;
var s = p/4;
} else {
var s = p/(2*Math.PI) * Math.asin (c/a);
}
return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
},
elasticOut: function(t, b, c, d, a, p){
if (t === 0) {
return b;
}
if ( (t /= d) == 1 ) {
return b+c;
}
if (!p) {
p=d*0.3;
}
if (!a || a < Math.abs(c)) {
a = c;
var s = p / 4;
} else {
var s = p/(2*Math.PI) * Math.asin (c/a);
}
return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b;
},
elasticBoth: function(t, b, c, d, a, p){
if (t === 0) {
return b;
}
if ( (t /= d/2) == 2 ) {
return b+c;
}
if (!p) {
p = d*(0.3*1.5);
}
if ( !a || a < Math.abs(c) ) {
a = c;
var s = p/4;
}
else {
var s = p/(2*Math.PI) * Math.asin (c/a);
}
if (t < 1) {
return - 0.5*(a*Math.pow(2,10*(t-=1)) *
Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
}
return a*Math.pow(2,-10*(t-=1)) *
Math.sin( (t*d-s)*(2*Math.PI)/p )*0.5 + c + b;
},
backIn: function(t, b, c, d, s){
if (typeof s == 'undefined') {
s = 1.70158;
}
return c*(t/=d)*t*((s+1)*t - s) + b;
},
backOut: function(t, b, c, d, s){
if (typeof s == 'undefined') {
s = 2.70158; //回缩的距离
}
return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
},
backBoth: function(t, b, c, d, s){
if (typeof s == 'undefined') {
s = 1.70158;
}
if ((t /= d/2 ) < 1) {
return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
}
return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
},
bounceIn: function(t, b, c, d){
return c - Tween['bounceOut'](d-t, 0, c, d) + b;
},
bounceOut: function(t, b, c, d){
if ((t/=d) < (1/2.75)) {
return c*(7.5625*t*t) + b;
} else if (t < (2/2.75)) {
return c*(7.5625*(t-=(1.5/2.75))*t + 0.75) + b;
} else if (t < (2.5/2.75)) {
return c*(7.5625*(t-=(2.25/2.75))*t + 0.9375) + b;
}
return c*(7.5625*(t-=(2.625/2.75))*t + 0.984375) + b;
},
bounceBoth: function(t, b, c, d){
if (t < d/2) {
return Tween['bounceIn'](t*2, 0, c, d) * 0.5 + b;
}
return Tween['bounceOut'](t*2-d, 0, c, d) * 0.5 + c*0.5 + b;
}
};
/*
el：要点击的元素
fn：点击之后要执行的事件
在点击的时候，记录手指坐标
抬起的时候，判断手指坐标和按下的手指坐标的差值，小于一定值时我们就认定它是点击
*/
function tap(el, fn){
var startPoint = {};
el.addEventListener('touchstart', function(e){
startPoint = {
x: e.changedTouches[0].pageX,
y: e.changedTouches[0].pageY
}
});
el.addEventListener('touchend', function(e){
var nowPoint = {
x: e.changedTouches[0].pageX,
y: e.changedTouches[0].pageY
}
if( Math.abs(nowPoint.x-startPoint.x)<5 && Math.abs(nowPoint.y-startPoint.y)<5 ){
fn&&fn.call(el, e);
}
});
}
function css(el, attr, val){
var transformArrt = [
'rotate',
'rotateX',
'rotateY',
'rotateZ',
'skewX',
'skewY',
'scale',
'scaleX',
'scaleY',
'translateX',
'translateY',
'translateZ'
]
for(var i=0; i<transformArrt.length; i++){
if( attr == transformArrt[i] ){ //如果attr等于transform中的一个值，就代表用户想要操作的是transform
return transform(el, attr, val);
}
}
if( val == undefined ){ // 当val不为空的时候，就是设置样式
if( attr == 'opacity' ){
el.style[attr] = val;
}else{
el.style[attr] = val+'px';
}
}else{ // 当val为空的时候，就是获取样式
var val = getComputedStyle(el)[attr];
val = parseFloat(val);
return val?val:0;
}
}
/* transform用来设置和获取transform相关的值 */
function transform(el, attr, val){
if( !el.transform ){
el.transform = {
}
}
/* 获取元素相应的值 */
if( val == undefined ){
return el.transform[attr]?el.transform[attr]:0;
}
el.transform[attr] = val; // 记录对象中元素的值
/*
旋转 deg
缩放
斜切 deg
位移 px
*/
var str = '';
for( var s in el.transform ){
switch(s){
case 'rotate':
case 'rotateX':
case 'rotateY':
case 'rotateZ':
case 'skewX':
case 'skewY':
str += s + '('+ el.transform[s] +'deg)';
break;
case 'scale':
case 'scaleX':
case 'scaleY':
str += s + '('+ el.transform[s] +')';
break;
case 'translateX':
case 'translateY':
case 'translateZ':
str += s + '('+ el.transform[s] +'px)';
break;
}
}
// 我们所有的设置都存在transform这个对象中，在真正设置的时候，需要把transform的所有设置都连接过来
el.style.WebkitTransform = el.style.transform = str;
}
function startMove(init){
var t = 0;
var b = {};//样式的初始值
var c = {};//样式的差值
var d = Math.ceil(init.time/16.7);
cancelAnimationFrame(init.el.timer);
for(var s in init.target) {
b[s] = css(init.el,s);
c[s] = init.target[s] - b[s];
}
init.el.timer = requestAnimationFrame(move);
function move(){
if(t > d || d == 0){
cancelAnimationFrame(init.el.timer);
init.callBack&&init.callBack.call(init.el);
} else {
t++;
for(var s in init.target){
var val = Tween[init.type](t,b[s],c[s],d);
css(init.el,s,val);
}
init.callIn&&init.callIn.call(init.el);
init.el.timer = requestAnimationFrame(move);
}
}
}
function swiper(init){
var wrap = init.wrap;//滑屏元素的父级
var scroll = wrap.children[0];//滑动的元素
var startPonit = {};//手指的初始位置
var startEl = {};// 元素的初始位置
var dir = init.dir;
var isFirst = true; //判断用户是否 是第一次执行move;
var lastTime = 0;
var lastTimeDis = 0;
//var F = .4;//拉力
var min = {
x:0,
y:0
}
var isDir = { //判断用户在对哪个方向进行滑屏
x: false,
y: false
};
var dirTranslate = {
x: "translateX",
y: "translateY"
};
var lastPoint = {};
var lastDis = 0;//最后一次的手指移动距离
css(scroll,"translateX",0);
css(scroll,"translateY",0);
css(scroll,"translateZ",0);
scroll.style.minWidth = "100%";
scroll.style.minHeight = "100%";
wrap.addEventListener('touchstart', function(e) {
cancelAnimationFrame(scroll.timer);
init.start&&init.start.call(wrap,e);
var touch = e.changedTouches[0];
startPonit = {
x: touch.pageX,
y: touch.pageY
};
lastPoint = {
x: touch.pageX,
y: touch.pageY
};
startEl = {
x: css(scroll,"translateX"),
y: css(scroll,"translateY")
};
min = {
x: wrap.clientWidth - scroll.offsetWidth,
y: wrap.clientHeight - scroll.offsetHeight
}
lastTime = Date.now();
lastTimeDis = 0;
lastDis = 0;
});
wrap.addEventListener('touchmove', function(e) {
var touch = e.changedTouches[0];
var nowTime = Date.now();
var nowPonit = {
x: touch.pageX,
y: touch.pageY
};
if(lastPoint.x == nowPonit.x
&&lastPoint.y == nowPonit.y){
return;
}
var dis = {
x: nowPonit.x - startPonit.x,
y: nowPonit.y - startPonit.y
};
if(isFirst){
if(Math.abs(dis.x) > Math.abs(dis.y)) {
isDir.x = true;
isFirst = false;
} else {
isDir.y = true;
isFirst = false;
}
}
var target = {
x: startEl.x + dis.x,
y: startEl.y + dis.y
};
if(isDir[dir]){
if(init.backOut == "none"){//不允许用户滑动超出
target[dir] = target[dir] > 0 ? 0:target[dir];
target[dir] = target[dir] < min[dir] ? min[dir]:target[dir];
} else if(init.backOut == "out"){ //超出添加回弹
if(target[dir] > 0){
//target[dir]的数值就是超出的距离
var over = target[dir];
var F = getF(over);
over *= F;
target[dir] = over;
} else if(target[dir] < min[dir]){
var over = min[dir] - target[dir];
var F = getF(over);
over *= F;
target[dir] = min[dir] - over;
}
}
css(scroll,dirTranslate[dir],target[dir]);
e.preventDefault();
lastDis = nowPonit[dir] - lastPoint[dir];//获取最后一次的距离
lastTimeDis = nowTime - lastTime;
}
init.move&&init.move.call(wrap,e);
lastPoint.x = nowPonit.x;
lastPoint.y = nowPonit.y;
lastTime = nowTime;
});
wrap.addEventListener('touchend', function(e) {
var nowTime = Date.now();//手指抬起时的时间
//console.log(lastDis,lastTimeDis);
if(nowTime - lastTime >= 100){
// 判断 当用户手指抬起时 和 最后一次移动的时候，有比较大的一个时间间隔，就可以认定 用户在抬起手指前有那么一段时间是按着不动的，那么我们也就不执行缓冲
lastDis = 0;
}
var lastSpeed = lastDis/lastTimeDis;//最后一次移动速度
//console.log(lastSpeed);
lastSpeed = lastSpeed?lastSpeed:0;
/* 最后一次的速度越大，位移出去的距离越大 */
var s = lastSpeed*170;//缓冲出去的距离
var now = css(scroll,dirTranslate[dir]);
s = Math.round(s + now);
if(s > 0){
s = 0;
} else if(s < min[dir]){
s = min[dir];
}
if(dir == "x"){
var target = {translateX: s}
} else {
var target = {translateY: s}
}
var time = Math.abs(s - now) * 1.15;
startMove({
el: scroll,
type: "easeOutStrong",
time: time,
target: target,
callIn: function(){
init.move&&init.move.call(wrap,e);
},
callBack: function(){
init.over&&init.over.call(wrap,e);
}
});
isFirst = true;
isDir = {
x: false,
y: false
};
init.end&&init.end.call(wrap,e);
});
function getF(over){
var max = dir == "x" ? wrap.clientWidth:wrap.clientHeight;
var F = 1 - over/max;
F = F < .4?.4:F;
return F;
}
}
function swiper(init){
var wrap = init.wrap;//滑屏元素的父级
var scroll = wrap.children[0];//滑动的元素
var startPonit = {};//手指的初始位置
var startEl = {};// 元素的初始位置
var dir = init.dir;
var isFirst = true; //判断用户是否 是第一次执行move;
var lastTime = 0;
var lastTimeDis = 0;
//var F = .4;//拉力
var min = {
x:0,
y:0
}
var isDir = { //判断用户在对哪个方向进行滑屏
x: false,
y: false
};
var dirTranslate = {
x: "translateX",
y: "translateY"
};
var lastPoint = {};
var lastDis = 0;//最后一次的手指移动距离
css(scroll,"translateX",0);
css(scroll,"translateY",0);
css(scroll,"translateZ",0);
scroll.style.minWidth = "100%";
scroll.style.minHeight = "100%";
wrap.addEventListener('touchstart', function(e) {
cancelAnimationFrame(scroll.timer);
init.start&&init.start.call(wrap,e);
var touch = e.changedTouches[0];
startPonit = {
x: touch.pageX,
y: touch.pageY
};
lastPoint = {
x: touch.pageX,
y: touch.pageY
};
startEl = {
x: css(scroll,"translateX"),
y: css(scroll,"translateY")
};
min = {
x: wrap.clientWidth - scroll.offsetWidth,
y: wrap.clientHeight - scroll.offsetHeight
}
lastTime = Date.now();
lastTimeDis = 0;
lastDis = 0;
});
wrap.addEventListener('touchmove', function(e) {
var touch = e.changedTouches[0];
var nowTime = Date.now();
var nowPonit = {
x: touch.pageX,
y: touch.pageY
};
if(lastPoint.x == nowPonit.x
&&lastPoint.y == nowPonit.y){
return;
}
var dis = {
x: nowPonit.x - startPonit.x,
y: nowPonit.y - startPonit.y
};
if(isFirst){
if(Math.abs(dis.x) > Math.abs(dis.y)) {
isDir.x = true;
isFirst = false;
} else {
isDir.y = true;
isFirst = false;
}
}
var target = {
x: startEl.x + dis.x,
y: startEl.y + dis.y
};
if(isDir[dir]){
if(init.backOut == "none"){//不允许用户滑动超出
target[dir] = target[dir] > 0 ? 0:target[dir];
target[dir] = target[dir] < min[dir] ? min[dir]:target[dir];
} else if(init.backOut == "out"){ //超出添加回弹
if(target[dir] > 0){
//target[dir]的数值就是超出的距离
var over = target[dir];
var F = getF(over);
over *= F;
target[dir] = over;
} else if(target[dir] < min[dir]){
var over = min[dir] - target[dir];
var F = getF(over);
over *= F;
target[dir] = min[dir] - over;
}
}
css(scroll,dirTranslate[dir],target[dir]);
e.preventDefault();
lastDis = nowPonit[dir] - lastPoint[dir];//获取最后一次的距离
lastTimeDis = nowTime - lastTime;
}
init.move&&init.move.call(wrap,e);
lastPoint.x = nowPonit.x;
lastPoint.y = nowPonit.y;
lastTime = nowTime;
});
wrap.addEventListener('touchend', function(e) {
var nowTime = Date.now();//手指抬起时的时间
//console.log(lastDis,lastTimeDis);
if(nowTime - lastTime >= 100){
// 判断 当用户手指抬起时 和 最后一次移动的时候，有比较大的一个时间间隔，就可以认定 用户在抬起手指前有那么一段时间是按着不动的，那么我们也就不执行缓冲
lastDis = 0;
}
var lastSpeed = lastDis/lastTimeDis;//最后一次移动速度
//console.log(lastSpeed);
lastSpeed = lastSpeed?lastSpeed:0;
/* 最后一次的速度越大，位移出去的距离越大 */
var s = lastSpeed*170;//缓冲出去的距离
var now = css(scroll,dirTranslate[dir]);
s = Math.round(s + now);
if(s > 0){
s = 0;
} else if(s < min[dir]){
s = min[dir];
}
if(dir == "x"){
var target = {translateX: s}
} else {
var target = {translateY: s}
}
var time = Math.abs(s - now) * 1.15;
startMove({
el: scroll,
type: "easeOutStrong",
time: time,
target: target,
callIn: function(){
init.move&&init.move.call(wrap,e);
},
callBack: function(){
init.over&&init.over.call(wrap,e);
}
});
isFirst = true;
isDir = {
x: false,
y: false
};
init.end&&init.end.call(wrap,e);
});
function getF(over){
var max = dir == "x" ? wrap.clientWidth:wrap.clientHeight;
var F = 1 - over/max;
F = F < .4?.4:F;
return F;
}
}
/*init:{
el: 要添加事件的元素,
start: 按下时要操作的事件gesturestart,
change:{ 手指移动时的回调gesturechange
e.scale 在change时，手指之间的距离和start时手指之间距离的比值,
e.rotation 在change时和start时，手指旋转角度的差值
},
end: 多指操作结束的回调
}*/
function gesture(init){
var isGesture = false;
var el = init.el;
var startDis = 0;
var startDeg = 0;
var startDeg = 0;
el.addEventListener('touchstart', function(e){
var touch = e.touches;
if( touch.length >=2 ){ //当屏幕上有两根以上的手指
isGesture = true;
startDis = getDis(touch[0], touch[1]);
startDeg = getDeg(touch[0], touch[1]);
init.start&&init.start.call(el, e);
}
});
el.addEventListener('touchmove', function(e){
var touch = e.touches;
if( touch.length >=2 && isGesture ){ //当屏幕上有两根以上的手指
isGesture = true;
var nowDis = getDis(touch[0], touch[1]);
var nowDeg = getDeg(touch[0], touch[1]);
e.scale = nowDis/startDis;
e.rotation = nowDeg - startDeg;
init.change&&init.change.call(el, e);
}
})
el.addEventListener('touchend', function(e){
if( isGesture ){
init.end&&init.end.call(el, e);
}
isGesture = false;
})
function getDis(point1, point2){
var x = point2.pageX - point1.pageX;
var y = point2.pageY - point1.pageY;
return Math.sqrt(x*x+y*y);
}
function getDeg(point1, point2){
var x = point2.pageX - point1.pageX;
var y = point2.pageY - point1.pageY;
return Math.atan2(y, x)*180/Math.PI;
}
}