web前端|js教程
javascript,缓冲效果
web前端-js教程
菜鸟版代码如下:
理解这段代码就基本上掌握了
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function f_s() {
var obj = document.getElementById("top");
obj.style.display = "block";
obj.style.height = "1px";
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var sw = function () {
var s_width = parseInt(obj.style.height);
if (s_width < 350) {
obj.style.height = (s_width + Math.ceil((350 - s_width) / 15)) + "px";
}
else {
clearInterval(st);
}
}
var st = window.setInterval(sw, 1);
}
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#top { width:80px; height:350px; float:left; background-color:#090; display:none; color:#fff; text-align:right; border:1px solid #000; s }
#top0 { width:80px; float:right; height:350px; background-color:#090; display:none; color:#fff; text-align:right; border:1px solid #000; s }
缓冲效果
打开这是一个由快到慢的过程关闭
打开这是一个由慢到快的过程关闭
function $(id) { return document.getElementById(id); } function f_s() { var obj = document.getElementById(“top”); obj.style.display = “block”; obj.style.height = “1px”;
var sw = function () { var s_width = parseInt(obj.style.height); if (s_width < 350) { obj.style.height = (s_width + Math.ceil((350 – s_width) / 10)) + "px"; } else { clearInterval(st); } } var st = window.setInterval(sw, 1); } function s_f() { var obj = document.getElementById("top0"); var mg = 1; obj.style.display = "block"; obj.style.height = "1px"; var sw = function () { var s_width = parseInt(obj.style.height); if (s_width 0) { obj.style.height = (s_height – Math.ceil(s_height / 15)) + “px”; } else { clearInterval(st1); obj.style.display = “none”; } } var st1 = window.setInterval(sw1, 1); }
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]中级版本
/*
函数名称: Scroll
Scroll(obj, h, s)
参数说明:
obj,[object] id值或对象. 必需
h,[height] 展开后的高度. 可选(默认为200px)
s,[speed] 展开速度,值越小展开速度越慢. 可选(默认为1.2){建议取值为1.1到2.0之间[例如:1.17]}.
函数返回值:
true 展开(对象的高度等于展开后的高度)
false 关闭(对象的高度等于原始高度)
*/
function Scroll(obj, h, s){
if(obj == undefined){return false;}
var h = h || 200;
var s = s || 1.2;
var obj = typeof(obj)=="string"?document.getElementById(obj):obj;
var status = obj.getAttribute("status")==null;
var oh = parseInt(obj.offsetHeight);
obj.style.height = oh;
obj.style.display = "block";
obj.style.overflow = "hidden";
if(obj.getAttribute("oldHeight") == null){
obj.setAttribute("oldHeight", oh);
}else{
var oldH = Math.ceil(obj.getAttribute("oldHeight"));
}
var reSet = function(){
if(status){
if(oh < h){
oh = Math.ceil(h-(h-oh)/s);
obj.style.height = oh+"px";
}else{
obj.setAttribute("status",false);
window.clearInterval(IntervalId);
}
}else{
obj.style.height = oldH+"px";
obj.removeAttribute("status");
window.clearInterval(IntervalId);
}
}
var IntervalId = window.setInterval(reSet,10);
return status;
}
这是一个段落啦!!哇哈哈哈
点我一下下啦:)
Hello World!
你敢点我不 -_|||
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]高级版本
这个很全,不过,我是没有看懂的.- -!!
/cloudgamer/
Tween类型：
ease类型：
/* 算法来源：/easing/ */ var Tween = {Linear: function(t,b,c,d){ return c*t/d + b; },Quad: { 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; }, easeInOut: function(t,b,c,d){ if ((t/=d/2) < 1) return c/2*t*t + b; return -c/2 * ((–t)*(t-2) – 1) + b; }},Cubic: { easeIn: function(t,b,c,d){ return c*(t/=d)*t*t + b; }, easeOut: function(t,b,c,d){ return c*((t=t/d-1)*t*t + 1) + b; }, easeInOut: function(t,b,c,d){ if ((t/=d/2) < 1) return c/2*t*t*t + b; return c/2*((t-=2)*t*t + 2) + b; }},Quart: { easeIn: function(t,b,c,d){ return c*(t/=d)*t*t*t + b; }, easeOut: function(t,b,c,d){ return -c * ((t=t/d-1)*t*t*t – 1) + b; }, easeInOut: 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; }},Quint: { easeIn: function(t,b,c,d){ return c*(t/=d)*t*t*t*t + b; }, easeOut: function(t,b,c,d){ return c*((t=t/d-1)*t*t*t*t + 1) + b; }, easeInOut: function(t,b,c,d){ if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b; return c/2*((t-=2)*t*t*t*t + 2) + b; }},Sine: { easeIn: function(t,b,c,d){ return -c * Math.cos(t/d * (Math.PI/2)) + c + b; }, easeOut: function(t,b,c,d){ return c * Math.sin(t/d * (Math.PI/2)) + b; }, easeInOut: function(t,b,c,d){ return -c/2 * (Math.cos(Math.PI*t/d) – 1) + b; }},Expo: { easeIn: function(t,b,c,d){ return (t==0) ? b : c * Math.pow(2, 10 * (t/d – 1)) + b; }, easeOut: function(t,b,c,d){ return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b; }, easeInOut: function(t,b,c,d){ if (t==0) return b; if (t==d) return b+c; if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t – 1)) + b; return c/2 * (-Math.pow(2, -10 * –t) + 2) + b; }},Circ: { easeIn: function(t,b,c,d){ return -c * (Math.sqrt(1 – (t/=d)*t) – 1) + b; }, easeOut: function(t,b,c,d){ return c * Math.sqrt(1 – (t=t/d-1)*t) + b; }, easeInOut: function(t,b,c,d){ if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 – t*t) – 1) + b; return c/2 * (Math.sqrt(1 – (t-=2)*t) + 1) + b; }},Elastic: { easeIn: function(t,b,c,d,a,p){ if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.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; }, easeOut: function(t,b,c,d,a,p){ if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.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); }, easeInOut: function(t,b,c,d,a,p){ if (t==0) return b; if ((t/=d/2)==2) return b+c; if (!p) p=d*(.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 -.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 )*.5 + c + b; }},Back: { easeIn: function(t,b,c,d,s){ if (s == undefined) s = 1.70158; return c*(t/=d)*t*((s+1)*t – s) + b; }, easeOut: function(t,b,c,d,s){ if (s == undefined) s = 1.70158; return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b; }, easeInOut: function(t,b,c,d,s){ if (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; }},Bounce: { easeIn: function(t,b,c,d){ return c – Tween.Bounce.easeOut(d-t, 0, c, d) + b; }, easeOut: 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 + .75) + b; } else if (t < (2.5/2.75)) { return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b; } else { return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b; } }, easeInOut: function(t,b,c,d){ if (t < d/2) return Tween.Bounce.easeIn(t*2, 0, c, d) * .5 + b; else return Tween.Bounce.easeOut(t*2-d, 0, c, d) * .5 + c*.5 + b; }} } ////////////////////////////////////////////////////////// var $ = function (id) {return "string" == typeof id ? document.getElementById(id) : id; }; var Each = function(list, fun){for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); } }; ////////////////////////////////////////////////////////// var fun, iChart = 550, iDuration = 100; function Move(){var oM = $("idMove").style, oL = $("idLine").style, t=0, c=500, d=iDuration;oM.left=oL.left="0px"; clearTimeout(Move._t);function _run(){ if(t<d){ t++; oM.left = Math.ceil(fun(t,0,c,d)) + "px"; oL.left = Math.ceil(Tween.Linear(t,0,iChart,d)) + "px"; Move._t = setTimeout(_run, 10); }else{ oM.left = c + "px"; oL.left = iChart + "px"; }}_run(); } //////////////////////////////////////////////////////// function Chart(){var a = [];for (var i = 0; i < iChart; i++) { a.push(
‘);}$(“idChart”).innerHTML = a.join(“”); }
////////////////////////////////////////////////////////
var arrTween = document.getElementsByName(“vTween”); var arrEase = document.getElementsByName(“vEase”);
Each(arrTween, function(o){ o.onclick = function(){ SetFun(); Chart(); } }) Each(arrEase, function(o){ o.onclick = function(){ SetFun(); Chart(); } })
function SetFun(){var sTween, sEase;Each(arrTween, function(o){ if(o.checked){ sTween = o.value; } })Each(arrEase, function(o){ if(o.checked){ sEase = o.value; } })fun = sTween == “Linear” ? Tween.Linear : Tween[sTween][sEase]; }
$(“idRun”).onclick = function(){ SetFun(); Chart(); Move(); }
$(“idSpeed”).onclick = function(){if(iDuration == 100){ iDuration = 500; this.value = “加快速度”;}else{ iDuration = 100; this.value = “减慢速度”;} }
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]打包下载
