<!doctype html>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width,user-scalable=no" />
<meta charset="utf-8">
<script type="text/javascript">
(function(){
setsize();
window.onresize = setsize;
function setsize(){
var html = document.documentelement;
var htmlw = html.clientwidth;
html.style.fontsize = htmlw / 16 + px;
}
})();
</script>
<title>document</title>
<style type="text/css">
body {
margin: 0;
background: #ccc;
}
ul {
margin: 0;
padding: 0;
list-style: none;
}
.navwrap {
position: relative;
border-bottom: 1px solid #000;
background: #f1f1f1;
height: 2.4rem;
overflow: hidden;
}
#navs {
position: absolute;
left: 0;
top: 0;
white-space: nowrap;
}
#navs li {
display: inline-block;
font: .8rem/2.4rem 宋体;
padding: 0 1rem;
}
#navs li:nth-of-type(1) {
background: #fff;
}
#navs li:nth-last-of-type(1) {
background: #fff;
}
#navs a {
text-decoration: none;
color: #000;
}
</style>
<script type="text/javascript" src="js/startmove.js?1.1.11"></script>
</head>
<body>
<nav class="navwrap">
<ul id="navs">
<li class="active"><a href="javascript:;" target="_blank">首页</a></li><li><a href="javascript:;" target="_blank">mv</a></li><li><a href="javascript:;" target="_blank">悦单</a></li><li><a href="javascript:;" target="_blank">v榜</a></li><li><a href="javascript:;" target="_blank">音乐</a></li><li><a href="javascript:;" target="_blank">商城</a></li><li><a href="javascript:;" target="_blank">节目</a></li><li><a href="javascript:;" target="_blank">饭团</a></li><li><a href="javascript:;" target="_blank">咨询</a></li><li><a href="javascript:;" target="_blank">商城</a></li><li><a href="javascript:;" target="_blank">节目</a></li><li><a href="javascript:;" target="_blank">饭团</a></li><li><a href="javascript:;" target="_blank">咨询</a></li><li><a href="javascript:;" target="_blank">我的家</a></li><li><a href="javascript:;" target="_blank">app下载</a></li><li><a href="javascript:;" target="_blank">热门应用</a></li>
</ul>
</nav>
<script type="text/javascript">
document.addeventlistener('touchstart', function(e) {
e.preventdefault();
});
(function(){
var navwrap = document.queryselector('.navwrap');
var navs = document.queryselector('#navs');
var start,startel,lasttime,lastdis,lastspeed;
var min = 0;
var max = 0;
var tc = .25;//拉力系数
/*
lasttime 上一次时间
lastdis 上一次位置
lastspeed 上一次速度
*/
navwrap.addeventlistener('touchstart', function(e) {
var touch = e.changedtouches[0];
start = touch.pagex;
startel = css(navs,left);
lasttime = date.now();
lastdis = touch.pagex;
min = navwrap.clientwidth - navs.offsetwidth;
});
navwrap.addeventlistener('touchmove', function(e) {
var touch = e.changedtouches[0];
var now = touch.pagex;
var x = now - start + startel;
var nowtime = date.now();
if(x > max){
x *= tc;
} else if(x < min) {
// 位移的幅度为什么没有减小？
x = (x - min)*tc + min;
}
css(navs,"left",x);
lastspeed = (touch.pagex - lastdis)/(nowtime - lasttime);
//得到上一次和这一次的滑动速度
lastdis = touch.pagex;
lasttime = nowtime;
});
navwrap.addeventlistener('touchend', function(e) {
//console.log(lastspeed);//最后一次滑动的速度
/* 速越快，缓冲的距离越大 */
if(date.now() - lasttime > 100){
//如果最后一次的move时间和我抬起的时候，相差比较大，说明我在抬起之前，有一定时间没有移动过，那松手之后，也应该保持不动
lastspeed = 0;
}
lastspeed = math.abs(lastspeed) < .1?0:lastspeed;
var translate = lastspeed * 200;//这是要缓冲出去距离
translate = math.abs(translate) > 1000?1000*(translate/math.abs(translate)):translate;
var target = translate + css(navs,left);
var type = easeoutstrong;
if(target > max){
target = 0;
type = backout;
} else if(target < min){
target = min;
type = "backout";
}
var time = math.abs((target -css(navs,"left")) * 1.3);
time = (time>0&&time<200)?200:time;
console.log(time);
startmove({
el:navs,
target: {
left: target
},
time: time,
type: type
});
});
})();
</script>
</body>
</html>
//动画形式公式
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;
}
}
// 获取或者设置样式
function css(el,attr,val){
if(arguments.length == 2){
if(el.currentstyle){
val = el.currentstyle[attr];
} else {
val = getcomputedstyle(el)[attr];
}
return parsefloat(val);
} else {
if(attr == "opacity"){
el.style.opacity = val;
el.style.filter = "alpha(opacity= "+val*100+")";
} else if(attr == "zindex"){
el.style[attr] = math.round(val);
}else {
el.style[attr] = val + "px";
}
}
}
//执行动画
function startmove(init){
clearinterval(init.el.timer);
var t = 0;
var b = {};
var c = {};
var d = init.time/20;
for( var s in init.target){
b[s] = css(init.el,s);
c[s] = init.target[s] - b[s];
}
init.el.timer = setinterval(function(){
t++;
if(t > d){
clearinterval(init.el.timer);
init.callback&&init.callback();
} else {
for(var s in init.target){
var val = tween[init.type](t,b[s],c[s],d);
css(init.el,s,val);
}
}
},20);
}
以上就是移动端横向滑屏和“橡皮筋”特效实例代码的详细内容。