<script type="text/<a style=" color: text-decoration:underline title="javascript" href="https://www.php.cn/zt/15724.html" target="_blank">javascript"><br/>(function(){<br/> setsize();<br/> window.onresize = setsize;<br/> function setsize(){<br/> var html = document.documentelement;<br/> var htmlw = html.clientwidth;<br/> html.style.fontsize = htmlw / 16 + "px";<br/> }<br/>})(); <br/></script>
<script type="text/javascript" src="js/startmove.js?1.1.11"></script>
<script type="text/javascript"><br/>document.addeventlistener('touchstart', function(e) {<br/> e.preventdefault();<br/>});<br/>(function(){<br/> var navwrap = document.queryselector('.navwrap');<br/> var navs = document.queryselector('#navs');<br/> var start,startel,lasttime,lastdis,lastspeed;<br/> var min = 0;<br/> var max = 0;<br/> var tc = .25;//拉力系数<br/> /*<br/> lasttime 上一次时间<br/> lastdis 上一次位置<br/> lastspeed 上一次速度<br/> */<br/> navwrap.addeventlistener('touchstart', function(e) {<br/> var touch = e.changedtouches[0];<br/> start = touch.pagex;<br/> startel = css(navs,"left");<br/> lasttime = date.now();<br/> lastdis = touch.pagex;<br/> min = navwrap.clientwidth - navs.offsetwidth;<br/> });<br/> navwrap.addeventlistener('touchmove', function(e) {<br/> var touch = e.changedtouches[0];<br/> var now = touch.pagex;<br/> var x = now - start + startel;<br/> var nowtime = date.now();<br/> if(x > max){<br/> x *= tc;<br/> } else if(x < min) {<br/> // 位移的幅度为什么没有减小？<br/> x = (x - min)*tc + min;<br/> }<br/> css(navs,"left",x);<br/> lastspeed = (touch.pagex - lastdis)/(nowtime - lasttime);<br/> //得到上一次和这一次的滑动速度<br/> lastdis = touch.pagex;<br/> lasttime = nowtime;<br/> });<br/> navwrap.addeventlistener('touchend', function(e) {<br/> //console.log(lastspeed);//最后一次滑动的速度<br/> /* 速越快，缓冲的距离越大 */<br/> if(date.now() - lasttime > 100){<br/> //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<br/> lastspeed = 0;<br/> }<br/> lastspeed = math.abs(lastspeed) < .1?0:lastspeed;<br/> var translate = lastspeed * 200;//这是要缓冲出去距离<br/> translate = math.abs(translate) > 1000?1000*(translate/math.abs(translate)):translate;<br/> var target = translate + css(navs,"left");<br/> var type = "easeoutstrong";<br/> if(target > max){<br/> target = 0;<br/> type = "backout";<br/> } else if(target < min){<br/> target = min;<br/> type = "backout";<br/> }<br/> var time = math.abs((target -css(navs,"left")) * 1.3);<br/> time = (time>0&&time<200)?200:time;<br/> console.log(time);<br/> startmove({<br/> el:navs,<br/> target: {<br/> left: target<br/> },<br/> time: time,<br/> type: type<br/> });<br/> });<br/>})(); <br/></script>
//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) 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) 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 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 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 a = c;
var s = p/4;
}
else {
var s = p/(2*Math.PI) * Math.asin (c/a);
}
if (t 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 ) 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) return c*(7.5625*t*t) + b;
} else if (t return c*(7.5625*(t-=(1.5/2.75))*t + 0.75) + b;
} else if (t 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 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);
}
