javascript常用函数

var Browser={
isIE:!!window.ActiveXObject,
isOpera:window.opera+"" =="[object Opera]"
};
String.prototype.repeat=function (n) {
//n表示字符串重得的次数
return new Array(n+1).join(this);
};
String.prototype.trim=function () {
return this.replace(/^\s+/,"").replace(/\s+$/,"");
};
Number.prototype.inter=function (a,b) {//检测数字是否在区间之内
var min=Math.min(a,b),max=Math.max(a,b);
return this==a || this==b || (Math.max(this,min)==this && Math.min(this,max)==this);
};
var Base={};
Base.extend=function (src,dest) {
for (var i in src) {
if (src[i]!=undefined) {
dest[i]=src[i];
}
}
};
(function () {
function jsonEncode(o) {
if (window.JSON+""==="[object JSON]") {
return JSON.stringify(o);
}
var t=typeof o;
switch(t) {
case "string":
return '"'+addslashes(o)+'"';
case "number":
case "boolean":
return o+"";
case "undefined":
case "function":
case "unknow":
return "null";
case "object":
if (!o) return "null";
var ret=[];
if (o instanceof Array) {
for (var i=0;i<o.length;i++) {
ret.push(jsonEncode(o[i]));
}
return "["+ret.join(",")+"]";
} else {
for (var i in o) {
ret.push(jsonEncode(i)+":"+jsonEncode(o[i]));
}
return "{"+ret.join(",")+"}";
}

}
}
//

var specialChars={
'"':'\\"',
'\\':'\\\\',
"\n":"\\n",
"\r":"\\r"
};
function addslashes(s) {//转义特殊字符
return s.replace(/\\|\n|\r|"/g,function (m) {
return specialChars[m];
});
}

Base.jsonEncode=jsonEncode;
Base.addslashes=addslashes;
})();

Base.init=function (Class,$this,args) {
$this.originalArgs=args;
for (var i in args) {
$this[i]=args[i];
}
if (Class.defaultArgs) {
for (i in Class.defaultArgs) {
if (args[i]===undefined)
$this[i]=Class.defaultArgs[i].valueOf($this);
}
}


};

if (document.implementation && document.implementation.createDocument) {
//W3C
Base.getXMLDOM=function () {//获取一个XMLDOM对象
return document.implementation.createDocument("","",null);
};
Base.loadXMLFile=function (xmlDom,url,callback) {
if (xmlDom.async===true) {
xmlDom.onload=function () {
if (xmlDom.documentElement.nodeName=="parsererror") {
throw new Error("XML Parse Error:"+xmlDom.documentElement.firstChild.nodeValue);
} else {
callback.call(xmlDom);
}
};
}
xmlDom.load(url);
return xmlDom;
};
Base.loadXMLString=function (xmlDom,s) {
var p = new DOMParser();
var newDom=p.parseFromString(s,"text/xml");
if (newDom.documentElement.nodeName=="parsererror") {
throw new Error("XML Parse Error:"+newDom.documentElement.firstChild.nodeValue);
}
while (xmlDom.firstChild) {
xmlDom.removeChild(xmlDom.firstChild);
}
for (var i=0,n;i<newDom.childNodes.length;i++) {
n=xmlDom.importNode(newDom.childNodes[i],true);
//importNode用于把其它文档中的节点导入到当前文档中
//true参数同时导入子节点
xmlDom.appendChild(n);
}
return xmlDom;
};
Base.getXML=function (xmlNode) {
var s= new XMLSerializer();
return s.serializeToString(xmlNode,"text/xml");
};
} else if (window.ActiveXObject) {
//IE
Base.getXMLDOM=function () {
return new ActiveXObject("Microsoft.XmlDom");
};
Base.loadXMLFile=function (xmlDom,url,callback) {
xmlDom.onreadystatechange=function () {
if (xmlDom.readyState===4) {
if (xmlDom.parseError.errorCode===0) {
callback.call(xmlDom);
} else {
throw new Error("XML Parse Error:"+xmlDom.parseError.reason);
}
}
};
xmlDom.load(url);
return xmlDom;
};
Base.loadXMLString=function (xmlDom,s) {
xmlDom.loadXML(s);
if (xmlDom.parseError.errorCode!==0) {
throw new Error("XML Parse Error:"+xmlDom.parseError.reason);
}
return xmlDom;
};
Base.getXML=function (xmlNode) {
return xmlNode.xml;
};
}

Base.selectSingleNode=function (node,xpath) {
if ("selectSingleNode" in node) {
return node.selectSingleNode(xpath);
} else {
var eva = new XPathEvaluator();
var result=eva.evaluate(xpath,xmlDom,null,XPathResult.ORDERED_NODE_ITERATOR_TYPE,null);
if (result) {//XPath执行失败会返回null
var node;
while (node=result.iterateNext()) {
return node;
}
}
}

};

Base.selectNodes=function (node,xpath) {
if ("selectNodes" in node) {
return node.selectNodes(xpath);
} else {
var eva = new XPathEvaluator();
var result=eva.evaluate(xpath,xmlDom,null,XPathResult.ORDERED_NODE_ITERATOR_TYPE,null);
if (result) {//XPath执行失败会返回null
var node,nodes=[];
while (node=result.iterateNext()) {
nodes.push(node);
}
return nodes;
}
}
};

Base.transform=function (xml,xslt,callback) {
var xmlDom,xsltDom;
if (typeof xml=="string") {
xmlDom=Base.getXMLDOM();
Base.loadXMLFile(xmlDom,xml,function () {
xsltDom=Base.getXMLDOM();
Base.loadXMLFile(xsltDom,xslt,function () {
callback(trans());
});
});
} else {
xmlDom=xml;
xsltDom=xslt;
}




function trans() {
if ("transformNode" in xmlDom) {
return xmlDom.transformNode(xsltDom);
} else {
var xsltpro=new XSLTProcessor();
xsltpro.importStylesheet(xsltDom);
var result=xsltpro.transformToDocument(xmlDom);
return Base.getXML(result);
}
}

};

Base.createXHR=function () {
return window.XMLHttpRequest?
new XMLHttpRequest():
new ActiveXObject("Microsoft.XMLHTTP");//IE6
}
/**
args {
url
method 默认值为get
success Function
data {key:value}
cache Boolean true表示缓存,默认值为false
}
*/
Base.ajax=function(args) {
var xhr=Base.createXHR(),data=Base.params(args.data);
args.method=args.method || "get";

if (/get/i.test(args.method)) {
args.url+="?"+data;
}
if (!args.cache) {
if (args.url.indexOf("?")<0) args.url+="?";
args.url+="&"+(+new Date());
}
xhr.open(args.method,args.url,true);

xhr.onreadystatechange=function () {
if (xhr.readyState===4 && xhr.status===200) {
args.success(xhr.responseText,xhr.responseXML);
}
};
if (/post/i.test(args.method)) {
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xhr.send(data);
} else {
xhr.send();
}

}

Base.params=function (o) {
var a=[];
for (var i in o) {
if (o[i]!=undefined) {
a.push(encodeURIComponent(i)+"="+encodeURIComponent(o[i]));
}
}
return a.join("&");
}
Base.prefix=function (n,pos) {
//接受一个数字，加前导0
//pos 表示当数字少于pos位的时候，加前导0
n=""+n;
//n=12,pos=4; 0012
if (n.length<pos) {
n="0".repeat(pos-n.length)+n;
}
return n;
};

Base.swapNode =function (a,b) {
//parentNode.insertBefore(要插入的节点,原来的节点)
//parentNode.replaceChild(newNode,child)
//parentNode.appendChild

var tmp=document.createTextNode("");
a.parentNode.replaceChild(tmp,a);
b.parentNode.replaceChild(a,b);
tmp.parentNode.replaceChild(b,tmp);


};

Base.delNode=function () {
for (var i=0,node;i<arguments.length;i++) {
node=arguments[i];
node.parentNode.removeChild(node);
}
};

function date(s,t) {
//s Y-m-d H:i:s
//t new Date()
t=t || new Date();
var re=/Y|m|d|H|i|s/g;
return s.replace(re,function($1) {
switch($1) {
case "Y":return t.getFullYear();
case "m":return t.getMonth()+1;
case "d":return t.getDate();
case "H":return t.getHours();
case "i":return t.getMinutes();
case "s":return t.getSeconds();
}
return $1;
});

}
/*
function $(id) {
return document.getEementById(id);
}*/

function htmlEncode(html) {
//return html.replace("<","&lt;").replace(">","&gt;")
arguments.callee.textNode.nodeValue=html;
return arguments.callee.div.innerHTML;
}
htmlEncode.div=document.createElement("div");
htmlEncode.textNode=document.createTextNode("");
htmlEncode.div.appendChild(htmlEncode.textNode);
//命名冲突

/*
var htmlEncode=(function () {
var div=document.createElement("div");
var t=document.createTextNode("");
div.appendChild(t);
return function (html) {
//return html.replace("<","&lt;").replace(">","&gt;")
t.nodeValue=html;
return div.innerHTML;
};
})();
*/

function getByClass(className,context) {
context=context || document;
if (context.getElementsByClassName) {
return context.getElementsByClassName(className);
}
var nodes=context.getElementsByTagName('*'),
ret=[];
for (var i=0;i<nodes.length;i++) {
if (hasClass(nodes[i],className)) ret.push(nodes[i]);
}
return ret;
}
function $(id) {
return document.getElementById(id);
}

function hasClass(node,className) {
var names=node.className.split(/\s+/);
for (var i=0;i<names.length;i++) {
if (names[i]==className) return true;
}
return false;
}

function addClass(o,className) {
if (!hasClass(o,className)) o.className += " "+className;
return o;
}
function invoke(methodName,context) {
var args=arguments;
return function () {
context[methodName].apply(context,[].slice.call(args,2));
};
}
//invoke(fn,obj,1,2,3) 执行fn函数，并将obj设成fn内部的this指向的对象
//1,2,3....都是传给fn的参数

function delClass(o,className) {
var names=o.className.split(/\s+/);
for (var i=0;i<names.length;i++) {
if (names[i]==className) delete names[i];
}
o.className=names.join(" ");
return o;
}

function animate(o,start,alter,dur,fx) {
var curTime=0;
var t=setInterval(function () {
if (curTime>=dur) clearInterval(t);
for (var i in start) {
o.style[i]=fx(start[i],alter[i],curTime,dur)+"px";
}
curTime+=40;

},40);
return function () {
clearInterval(t);
};
}

function addEvent(obj,evt,fn) {
if (obj.addEventListener && !Browser.isOpera) {
obj.addEventListener(evt,fn,false);
return obj;
}


if (!obj.functions) obj.functions={};
if (!obj.functions[evt])
obj.functions[evt]=[];

//obj.functions["mousedown"]=[]
var functions=obj.functions[evt];
for (var i=0;i<functions.length;i++) {
if (functions[i]===fn) return obj;
}
functions.push(fn);
//fn.index=functions.length-1;


if (typeof obj["on"+evt]=="function") {
//alert(obj["on"+evt]);//当这一行执行到时，obj["on"+evt] 就是handler
//alert(obj["on"+evt]==handler);
if (obj["on"+evt]!=handler)
functions.push(obj["on"+evt]);
}
obj["on"+evt]=handler;
return obj;


}

function delEvent(obj,evtype,fn) {
if (obj.removeEventListener && !Browser.isOpera) {
obj.removeEventListener(evtype,fn,false);
return obj;
}
var fns=obj.functions || {};
fns=fns[evtype] || [];
for (var i=0;i<fns.length;i++) {
if (fns[i]==fn) {
fns.splice(i,1);
return obj;
}
}
}

function handler(evt) {//哪个事件发生了?
//对event对象标准化
var evt=fixEvt(evt || window.event,this);
var evtype=evt.type;
var functions=this.functions[evtype];
for (var i=0;i<functions.length;i++) {
if (functions[i]) functions[i].call(this,evt);
}
}

function fixEvt(evt,o) {
if (!evt.target) {//IE
evt.target=evt.srcElement;
if (evt.type=="mouseover")
evt.relatedTarget=evt.fromElement;
else if ("mouseout"==evt.type)
evt.relatedTarget=evt.toElement;

evt.pageX=evt.clientX+document.documentElement.scrollLeft;
evt.pageY=evt.clientY+document.documentElement.scrollTop;
evt.stopPropagation=function () {
evt.cancelBubble=true;
};
evt.preventDefault=function () {
evt.returnValue=false;
};
}

//IE与Opera的offsetX,offsetY没有将边框算进之内
if (o!=window && o.nodeType) {//要求是一个DOM对象
//evt.layerX=evt.offsetX+o.clientLeft;
//evt.layerY=evt.offsetY+o.clientTop;
//如何获取一个DOM元素在页面中的坐标
var offset=getOffset(o);
evt.layerX=evt.pageX-offset.x;
evt.layerY=evt.pageY-offset.y;

}


return evt;
}
function getRealStyle(o,name) {
if (window.getComputedStyle) {
var style=window.getComputedStyle(o,null);
return style.getPropertyValue(name);
} else {
var style=o.currentStyle;
name=camelize(name);
if (name=="float")
name="styleFloat";
return style[name];
}

}

function camelize(s) {//将CSS属性名转换成驼峰式
return s.replace(/-[a-z]/gi,function (c) {
return c.charAt(1).toUpperCase();
});
}

function getOffset(o) {
//o.offsetLeft
//o.offsetTop
//o.offsetParent
var x=y=0,de=document.documentElement;
if (o==de) {
return {
x:de.scrollLeft,
y:de.scrollTop
};
}
while (o) {
x+=o.offsetLeft;
y+=o.offsetTop;
o=o.offsetParent;
if (o && o!=de && !Browser.isOpera) {
x+=o.clientLeft;
y+=o.clientTop;
}
}
return {
x:x,
y:y
};
}

var Tween = {
Linear:function (start,alter,curTime,dur) {return start+curTime/dur*alter;},//最简单的线性变化,即匀速运动
Quad:{//二次方缓动
easeIn:function (start,alter,curTime,dur) {
return start+Math.pow(curTime/dur,2)*alter;
},
easeOut:function (start,alter,curTime,dur) {
var progress =curTime/dur;
return start-(Math.pow(progress,2)-2*progress)*alter;
},
easeInOut:function (start,alter,curTime,dur) {
var progress =curTime/dur*2;
return (progress<1?Math.pow(progress,2):-((--progress)*(progress-2) - 1))*alter/2+start;
}
},
Cubic:{//三次方缓动
easeIn:function (start,alter,curTime,dur) {
return start+Math.pow(curTime/dur,3)*alter;
},
easeOut:function (start,alter,curTime,dur) {
var progress =curTime/dur;
return start-(Math.pow(progress,3)-Math.pow(progress,2)+1)*alter;
},
easeInOut:function (start,alter,curTime,dur) {
var progress =curTime/dur*2;
return (progress<1?Math.pow(progress,3):((progress-=2)*Math.pow(progress,2) + 2))*alter/2+start;
}
},
Quart:{//四次方缓动
easeIn:function (start,alter,curTime,dur) {
return start+Math.pow(curTime/dur,4)*alter;
},
easeOut:function (start,alter,curTime,dur) {
var progress =curTime/dur;
return start-(Math.pow(progress,4)-Math.pow(progress,3)-1)*alter;
},
easeInOut:function (start,alter,curTime,dur) {
var progress =curTime/dur*2;
return (progress<1?Math.pow(progress,4):-((progress-=2)*Math.pow(progress,3) - 2))*alter/2+start;
}
},
Quint:{//五次方缓动
easeIn:function (start,alter,curTime,dur) {
return start+Math.pow(curTime/dur,5)*alter;
},
easeOut:function (start,alter,curTime,dur) {
var progress =curTime/dur;
return start-(Math.pow(progress,5)-Math.pow(progress,4)+1)*alter;
},
easeInOut:function (start,alter,curTime,dur) {
var progress =curTime/dur*2;
return (progress<1?Math.pow(progress,5):((progress-=2)*Math.pow(progress,4) +2))*alter/2+start;
}
},
Sine :{//正弦曲线缓动
easeIn:function (start,alter,curTime,dur) {
return start-(Math.cos(curTime/dur*Math.PI/2)-1)*alter;
},
easeOut:function (start,alter,curTime,dur) {
return start+Math.sin(curTime/dur*Math.PI/2)*alter;
},
easeInOut:function (start,alter,curTime,dur) {
return start-(Math.cos(curTime/dur*Math.PI/2)-1)*alter/2;
}
},
Expo: {//指数曲线缓动
easeIn:function (start,alter,curTime,dur) {
return curTime?(start+alter*Math.pow(2,10*(curTime/dur-1))):start;
},
easeOut:function (start,alter,curTime,dur) {
return (curTime==dur)?(start+alter):(start-(Math.pow(2,-10*curTime/dur)+1)*alter);
},
easeInOut:function (start,alter,curTime,dur) {
if (!curTime) {return start;}
if (curTime==dur) {return start+alter;}
var progress =curTime/dur*2;
if (progress < 1) {
return alter/2*Math.pow(2,10* (progress-1))+start;
} else {
return alter/2* (-Math.pow(2, -10*--progress) + 2) +start;
}
}
},
Circ :{//圆形曲线缓动
easeIn:function (start,alter,curTime,dur) {
return start-alter*Math.sqrt(-Math.pow(curTime/dur,2));
},
easeOut:function (start,alter,curTime,dur) {
return start+alter*Math.sqrt(1-Math.pow(curTime/dur-1));
},
easeInOut:function (start,alter,curTime,dur) {
var progress =curTime/dur*2;
return (progress<1?1-Math.sqrt(1-Math.pow(progress,2)):(Math.sqrt(1 - Math.pow(progress-2,2)) + 1))*alter/2+start;
}
},
Elastic: {//指数衰减的正弦曲线缓动
easeIn:function (start,alter,curTime,dur,extent,cycle) {
if (!curTime) {return start;}
if ((curTime==dur)==1) {return start+alter;}
if (!cycle) {cycle=dur*0.3;}
var s;
if (!extent || extent< Math.abs(alter)) {
extent=alter;
s = cycle/4;
} else {s=cycle/(Math.PI*2)*Math.asin(alter/extent);}
return start-extent*Math.pow(2,10*(curTime/dur-1)) * Math.sin((curTime-dur-s)*(2*Math.PI)/cycle);
},
easeOut:function (start,alter,curTime,dur,extent,cycle) {
if (!curTime) {return start;}
if (curTime==dur) {return start+alter;}
if (!cycle) {cycle=dur*0.3;}
var s;
if (!extent || extent< Math.abs(alter)) {
extent=alter;
s =cycle/4;
} else {s=cycle/(Math.PI*2)*Math.asin(alter/extent);}
return start+alter+extent*Math.pow(2,-curTime/dur*10)*Math.sin((curTime-s)*(2*Math.PI)/cycle);
},
easeInOut:function (start,alter,curTime,dur,extent,cycle) {
if (!curTime) {return start;}
if (curTime==dur) {return start+alter;}
if (!cycle) {cycle=dur*0.45;}
var s;
if (!extent || extent< Math.abs(alter)) {
extent=alter;
s =cycle/4;
} else {s=cycle/(Math.PI*2)*Math.asin(alter/extent);}
var progress = curTime/dur*2;
if (progress<1) {
return start-0.5*extent*Math.pow(2,10*(progress-=1))*Math.sin( (progress*dur-s)*(2*Math.PI)/cycle);
} else {
return start+alter+0.5*extent*Math.pow(2,-10*(progress-=1)) * Math.sin( (progress*dur-s)*(2*Math.PI)/cycle);
}
}
},
Back:{
easeIn: function (start,alter,curTime,dur,s){
if (typeof s == "undefined") {s = 1.70158;}
return start+alter*(curTime/=dur)*curTime*((s+1)*curTime - s);
},
easeOut: function (start,alter,curTime,dur,s) {
if (typeof s == "undefined") {s = 1.70158;}
return start+alter*((curTime=curTime/dur-1)*curTime*((s+1)*curTime + s) + 1);
},
easeInOut: function (start,alter,curTime,dur,s){
if (typeof s == "undefined") {s = 1.70158;}
if ((curTime/=dur/2) < 1) {
return start+alter/2*(Math.pow(curTime,2)*(((s*=(1.525))+1)*curTime- s));
}
return start+alter/2*((curTime-=2)*curTime*(((s*=(1.525))+1)*curTime+ s)+2);
}
},
Bounce:{
easeIn: function(start,alter,curTime,dur){
return start+alter-Tween.Bounce.easeOut(0,alter,dur-curTime,dur);
},
easeOut: function(start,alter,curTime,dur){
if ((curTime/=dur) < (1/2.75)) {
return alter*(7.5625*Math.pow(curTime,2))+start;
} else if (curTime < (2/2.75)) {
return alter*(7.5625*(curTime-=(1.5/2.75))*curTime + .75)+start;
} else if (curTime< (2.5/2.75)) {
return alter*(7.5625*(curTime-=(2.25/2.75))*curTime + .9375)+start;
} else {
return alter*(7.5625*(curTime-=(2.625/2.75))*curTime + .984375)+start;
}
},
easeInOut: function (start,alter,curTime,dur){
if (curTime< dur/2) {
return Tween.Bounce.easeIn(0,alter,curTime*2,dur) *0.5+start;
} else {
return Tween.Bounce.easeOut(0,alter,curTime*2-dur,dur) *0.5 + alter*0.5 +start;
}
}
}
};