function parseDate(value) {   
    var date = null;   
    if (Date.prototype.isPrototypeOf(value)) {   
        date = value;   
    } else if (typeof (value) == "string") {   
        date = new Date(value.replace(/-/g, "/"));   
    } else if (value != null && value.getTime) {   
        date = new Date(value.getTime());   
    }   
    ;   
    return date;   
};   
  
/**  
 * 将对象转换为字符串类型  
 */  
function parseString(value) {   
    if (value == null) {   
        return "";   
    } else {   
        return value.toString();   
    }   
};   
String.prototype.fillChar = function(length,mode,char){   
    if(!char){   
        char = "0";   
    }   
    if(this.length>length){//比实际想要的长度更大   
        if(mode=="after"){//如果是要在后面填充，截取的时候会将会后面的部分截取掉   
            return this.substr(0,length);   
        } else {//默认截取前一部分的数据   
            return this.substr(this.length - length,length);   
        }   
    }   
    var appendStr = "";   
    for(var i = 0; i < (length - this.length)/char.length;i++){   
        appendStr += char;   
    }   
    if(mode == "after"){   
        return this + appendStr;   
    }   
    else {   
        return appendStr + this;   
    }   
};  
/**  
 * 对日期进行格式化，  
 * @param date 要格式化的日期  
 * @param pattern 进行格式化的模式  
 *     支持的模式字母有：  
 *     y:年,  
 *     M:年中的月份(1-12),  
 *     d:月份中的天(1-31),  
 *     H:小时(0-23),  
 *     h:小时(0-12),  
 *     m:分(0-59),  
 *     s:秒(0-59),  
 *     S:毫秒(0-999),  
 *     E:星期(以汉语表示),  
 *     e:星期(以英文表示),  
 *     A:上午/下午标识,  
 *     a:AM/PM标识  
 * @return  
 */  
function formatDate(date,pattern){   
    var d;   
    if((d=parseDate(date))==null){   
        return "";   
    }   
    if(!pattern){   
        pattern = "yyyy-MM-dd";   
    }   
    var arrWeek = ["星期日","星期一","星期二","星期三","星期四","星期五","星期六","Sunday","Monday","Tuesday","Tuesday","Thursday","Friday","Saturday"];   
    var value = new Object();   
    value["y"] = parseString(date.getFullYear());   
    value["M"] = parseString(date.getMonth() + 1);   
    value["d"] = parseString(date.getDate());   
    value["H"] = parseString(date.getHours());   
    value["h"] = parseString(value["H"] > 12 ? (value["H"]-12) : value["H"]);   
    value["m"] = parseString(date.getMinutes());   
    value["s"] = parseString(date.getSeconds());   
    value["S"] = parseString(date.getMilliseconds());   
    value["E"] = arrWeek[date.getDay()];   
    value["e"] = arrWeek[date.getDay() + 7];   
    value["a"] = (value["H"] > 12 ? "PM" : "AM");   
    value["A"] = (value["H"] > 12 ? "下午" : "上午");   
    var result = "";   
    var i = 0;   
    var hasE = false;//是否出现过星期   
    var hasAMPM = false;//是否出现过上午下午   
    while(i < pattern.length){   
        var c = pattern.charAt(i++);   
        var lc = c;//记录本次要处理的字母,如'y'   
        var tmpStr = c;//本次在处理的字母格式,如'yyyy'   
        while(i < pattern.length && (c=pattern.charAt(i))==lc){   
            tmpStr += c;   
            i++;   
        }   
        if(value[lc]!=""&&value[lc]!=null&&value[lc]!="undefined"){   
            //本次要处理的字母是模式母   
            if((lc == "E" || lc == "e") && !hasE){   
                //星期   
                result += value[lc];   
                hasE = true;   
            } else if(lc == "E" || lc == "e") {   
                result += tmpStr;   
            } else if((lc=="a" || lc == "A")  && !hasAMPM){   
                //上下午   
                result += value[lc];   
                hasAMPM = true;   
            } else if((lc=="a" || lc == "A") ){   
                result += tmpStr;   
            } else {   
                //如果是 单个的日期，月份，小时，分，秒的字符串，不能再进行字符串的截取操作   
                if(tmpStr == "d" || tmpStr == "M" || tmpStr=="H" || tmpStr=="h" || tmpStr == "m" || tmpStr == "s"){   
                    result += value[lc];   
                } else {   
                    result += value[lc].fillChar(tmpStr.length);   
                }   
            }   
        } else {//非模式字母，直接输出   
            result += tmpStr;   
        }   
    }   
    return result;   
}