BaSaRa 目前关心的是UI技术

//Facade模式实例
var net=new Object();
net.READY_STATE_UNINITIALIZED=0;
net.READY_STATE_LOADING=1;
net.READY_STATE_LOADED=2;
net.READY_STATE_INTERACTIVE=3;
net.READY_STATE_COMPLETE=4;
net.ContentLoader=function(url,onload,onerror){
this.url=url;
this.req=null;
this.onload=onload;
this.onerror=(onerror) ? onerror : this.defaultError;
this.loadXMLDoc(url);
net.ContentLoader.prototype={
  loadXMLDoc:function(url){
    if (window.XMLHttpRequest){
      this.req=new XMLHttpRequest();
    } else if (window.ActiveXObject){
      this.req=new ActiveXObject("Microsoft.XMLHTTP");
    }
    if (this.req){
      try{
        var loader=this;
        this.req.onreadystatechange=function(){
        loader.onReadyState.call(loader);
      }
      this.req.open('GET',url,true);
      this.req.send(null);
      }catch (err){
        this.onerror.call(this);
      }
    }
  },
  onReadyState:function(){
    var req=this.req;
    var ready=req.readyState;
    if (ready==net.READY_STATE_COMPLETE){
      var httpStatus=req.status;
      if (httpStatus==200 || httpStatus==0){
        this.onload.call(this);
      }else{
        this.onerror.call(this);
      }
    }
  },
  defaultError:function(){
    alert("error fetching data!"
      +"\n\nreadyState:"+this.req.readyState
      +"\nstatus: "+this.req.status
      +"\nheaders: "+this.req.getAllResponseHeaders());
  }
}

//Adapter模式实例
var xhr = new XMLHttpRequest();
xhr.open("GET", "myData.xml");
xhr.onreadystatechange = function(){
  if(xhr.readyState == 4){
    alert(xhr.responseXML);
  }
}
xhr.send(null);

//Observer模式实例
window.onloadListeners=new Array();
  window.addOnLoadListener(listener){
  window.onloadListeners[window.onloadListeners.length]=listener;
}

window.onload=function(){
  for(var i=0;i<window.onloadListeners.length;i++){
    var func=window.onlloadListeners[i];
    func.call();
  }
}

//Singleton模式实例
var SingletonObj = {
  property1: value1,
  property2: value2,
  ...
  method1:function(){
    ...
  }
  method2:function(){
    ...
  }
  ...
}

function getSingletonObj() {
  if(!top.SingletonObj) {
    var top.SingletonObj = {
      ...
    }
    top.SingletonObj.init(...);
  }
  return top.SingletonObj;
}

//Command模式实例
function buttonOnclickHandler(event){
  var data=calculate();
  showData(dataTable,data);
}
function ajaxOnloadHandler(){
  var data=calculate();
  showData(otherDataTable,data);
}
function calculate(){
  var data=new Array();
  data[0]=6;
  data[1]=data[0]/3;
  data[2]=data[0]*data[1]+7;
  return data;
}
function showData(table,data){
  var newRow=createTableRow(table);
  for (var i=0;i<data.length;i++){
    createTableCell(newRow,data[i]);
  }
}
buttonDiv.onclick=buttonOnclickHandler;
poller.onload=ajaxOnloadHandler;

//MVC应用实例
function Button(value,domEl){
  this.domEl=domEl;
  this.value=value;
  this.domEl.buttonObj=this;
  this.domEl.onclick=this.clickHandler;
}

Button.prototype.clickHandler=function(){
  var buttonObj=this.buttonObj;
  var value=(buttonObj && buttonObj.value) ?
    buttonObj.value : "unknown value";
  alert(value);
}