/** 
* 将时间转换成固定格式输出 
* new Date().toFormat('yyyy-MM-dd HH:mm:ss'); 
* new Date().toFormat('yyyy/MM/dd hh:mm:ss'); 
* 只支持关键字(yyyy、MM、dd、HH、hh、mm、ss)HH:表示24小时,hh表示12小时 
*/  
Date.prototype.toFormatString=function(format){  
    var formatstr = format;  
    if(format != null && format != ""){  
        //设置年  
        if(formatstr.indexOf("yyyy") >=0 ){  
            formatstr = formatstr.replace("yyyy",this.getFullYear());  
        }  
        //设置月  
        if(formatstr.indexOf("MM") >=0 ){  
            var month = this.getMonth() + 1;  
            if(month < 10){  
                month = "0" + month;  
            }  
            formatstr = formatstr.replace("MM",month);  
        }  
        //设置日  
        if(formatstr.indexOf("dd") >=0 ){  
            var day = this.getDay();  
            if(day < 10){  
                day = "0" + day;  
            }  
            formatstr = formatstr.replace("dd",day);  
        }  
        //设置时 - 24小时  
        var hours = this.getHours();  
        if(formatstr.indexOf("HH") >=0 ){  
            if(month < 10){  
                month = "0" + month;  
            }  
            formatstr = formatstr.replace("HH",hours);  
        }  
        //设置时 - 12小时  
        if(formatstr.indexOf("hh") >=0 ){  
            if(hours > 12){  
                hours = hours - 12;  
            }  
            if(hours < 10){  
                hours = "0" + hours;  
            }  
            formatstr = formatstr.replace("hh",hours);  
        }  
        //设置分  
        if(formatstr.indexOf("mm") >=0 ){  
            var minute = this.getMinutes();  
            if(minute < 10){  
                minute = "0" + minute;  
            }  
            formatstr = formatstr.replace("mm",minute);  
        }  
        //设置秒  
        if(formatstr.indexOf("ss") >=0 ){  
            var second = this.getSeconds();  
            if(second < 10){  
                second = "0" + second;  
            }  
            formatstr = formatstr.replace("ss",second);  
        }  
    }  
    return formatstr;  
}