//Ajax扩展
var Ajax = function(url, params, callback) {
    var reqError = "\u54cd\u5e94\u5f02\u5e38\uff01\uff01\uff01";
    var sendData = null;
    var createXHR = function () {
        var XHR;
        if (window.XMLHttpRequest) {
            XHR = new XMLHttpRequest();
        } else {
            if (window.ActiveXObject) {
                try {
                    XHR = new ActiveXObject("Msxml2.XMLHTTP");
                }
                catch (e) {
                    try {
                        XHR = new ActiveXObject("Microsoft.XMLHTTP");
                    }
                    catch (e) {
                    }
                }
            }
        }
        return XHR;
    };
    var processParams = function () {
        var ret = "";
        for (var p in params) {
            ret += "&";
            ret += p + "=" + params[p];
        }
        ret = ret.substring(1);
        return ret;
    };
    var method = (url.indexOf("?") == -1) ? "POST" : "GET";
    if (params&&typeof(params)=='object') {
        if(typeof(params)=='object'){
            if (method == "GET") {
                url += "&" + processParams();
            } else {
                sendData = processParams();
            }
        }
        if(typeof(params)=='string'){
            if (method == "GET") {
                url += "&" + params;
            } else {
                sendData = params;
            }
        }
    }
    var xhr = createXHR();
    xhr.open(method, url, true);
    if (method == "POST") {
        xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");   
    }
    xhr.onreadystatechange = function () {
        if (xhr.readyState == 4) {
            if (xhr.status == 200) {
                if(callback){
                    callback(xhr);
                };
            } else {
                window.alert(reqError);
            }
        }
    };
    xhr.send(sendData);
};
//Array扩展
Array.prototype.indexOf=function (el) {
	var ret=-1;
	for(var k=0;k<this.length;k++) {
		if(this[k]==el) {
			ret=k;
			break;
		}
	}
	return ret;
};
Array.prototype.each=function (fn) {
	for(var k=0;k<this.length;k++) {
		fn(this[k],k);
	}
};
Array.prototype.unique=function () {
	var temp={};
	var result=[];
	for(var k=0;k<this.length;k++) {
		if(!temp[this[k]]) {
			temp[this[k]]=true;
		}
	}
	for(var i in temp) {
		result.push(i);
	}
	return result;
};
Array.prototype.remove=function (el) {
	while(this.indexOf(el)!=-1) {
		this.splice(this.indexOf(el),1);
	}
	return this;
};
var Map=function () {   
    this.map={};   
    this.keys=[];   
    this.values=[];   
    this.count=0;   
    this.add=function (k,v) {   
        this.map[k]=v;   
        var index=this.keys.indexOf(k);   
        if(index!=-1) {   
            this.values[index]=v;   
        }else {   
            this.keys.push(k);   
            this.values.push(v);   
            this.count++;   
        }   
    };
    this.get=function (k) {   
        return this.map[k];
    }      
};
//Function扩展
Function.prototype.defer=function () {
	var time=arguments[0]?arguments[0]:1000;
	var params=[];
	for(var k=1;k<arguments.length;k++) {
		params.push(arguments[k]);
	}
	params=params.join(",");
	window.setTimeout(this(params),time);
};

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