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;
   }
  }
 }
};