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Javascript 中的 javascript 缓冲效果实现代码推荐

出处:互联网 整理: 软晨网（RuanChen.com） 发布: 2009-10-12 浏览: 200 ::

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ExtJS 配置和表格控件使用 html数组字符串拼接的最快方法

缓冲效果就是实现一个页面的由慢到快或由快到慢的过程。菜鸟版代码如下:
理解这段代码就基本上掌握了

复制代码代码如下:

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) / 15)) + "px"; 
} 
else { 
clearInterval(st); 
} 
} 
var st = window.setInterval(sw, 1); 
}

点击运行可以看到效果:

[Ctrl+A 全选提示:你可先修改部分代码,再按运行]

中级版本

复制代码代码如下:

/* 
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; 
}

点击运行可以看到效果:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-CN" lang="zh-CN">
<head>
<title>层展开/关闭 - 运动缓冲效果</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta name="keywords" content="小秦,展开,关闭,运动缓冲,效果,javascript,封装" />
<meta name="description" content="展开/关闭 - 运动缓冲效果" />
<meta name="copyright" content="Copyright 2008 XQin.cn" />
<meta name="author" content="小秦" />
<script type="text/javascript">
/*
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;
}
window.onload= function(){
document.getElementById('detail').onclick = function(){
Scroll('detail', 300, 1.3);
}
document.getElementById('text').onclick = function(){
Scroll('text');
}
}
</script>
</head>
<body>
<p id="detail" style="border:1px dashed #f00;">这是一个段落啦!!哇哈哈哈
点我一下下啦:)
<div id="text" style="border:1px solid #0f0">Hello World!
你敢点我不 -_|||</div>
<button onclick="Scroll('text', 400, 1.2)">Hello World</button>
</body>
</html>

[Ctrl+A 全选提示:你可先修改部分代码,再按运行]

高级版本
这个很全,不过,我是没有看懂的.- -!!
http://www.cnblogs.com/cloudgamer/

点击运行可以看到效果:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>Tween</title>
</head>
<body>
<div style="padding-left:50px;">
<div style="position:relative; border:1px solid #000000; width:550px; height:50px;">
<div id="idMove" style="width:50px; height:50px; background:#930; position:absolute;"></div>
</div>
<div style="position:relative;width:550px;height:200px; margin-top:50px;">
<div id="idChart" style="border:1px solid #000;height:200px;"> </div>
<div id="idLine" style="position:absolute;top:0;left:0;height:200px;width:1px;background:#000;"></div>
</div>
</div>
<div> Tween类型： <br>
<label>
<input name="vTween" type="radio" value="Linear" checked="checked" />
Linear </label>
<label>
<input name="vTween" type="radio" value="Quad" />
Quadratic </label>
<label>
<input name="vTween" type="radio" value="Cubic" />
Cubic </label>
<label>
<input name="vTween" type="radio" value="Quart" />
Quartic </label>
<label>
<input name="vTween" type="radio" value="Quint" />
Quintic </label>
<label>
<input name="vTween" type="radio" value="Sine" />
Sinusoidal </label>
<br>
<label>
<input name="vTween" type="radio" value="Expo" />
Exponential </label>
<label>
<input name="vTween" type="radio" value="Circ" />
Circular </label>
<label>
<input name="vTween" type="radio" value="Elastic" />
Elastic </label>
<label>
<input name="vTween" type="radio" value="Back" />
Back </label>
<label>
<input name="vTween" type="radio" value="Bounce" />
Bounce </label> ease类型： <br>
<label>
<input name="vEase" type="radio" value="easeIn" checked="checked" />
easeIn </label>
<label>
<input name="vEase" type="radio" value="easeOut" />
easeOut </label>
<label>
<input name="vEase" type="radio" value="easeInOut" />
easeInOut </label>
<input id="idSpeed" type="button" value="减慢速度" />
<input id="idRun" type="button" value=" Run " />
</div>
<script>
/*
算法来源：http://www.robertpenner.com/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('<div style="background-color:#f60;font-size:0;width:3px;height:3px;position:absolute;left:' + (i-1) + 'px;top:' + (Math.ceil(fun(i,200,-200,iChart))) + 'px;"><\/div>'); } $("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"; }
}
</script>
</body>
</html>

[Ctrl+A 全选提示:你可先修改部分代码,再按运行]

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ExtJS 配置和表格控件使用 html数组字符串拼接的最快方法

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