javascript Date类的扩展

大家可以看到js的date类的方法很少，而很少有人去扩展这个类，所以我就做了个扩展，供大家参考，欢迎大家补充。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>datetime</title>

</head>

<body>

Date.prototype.add = function(milliseconds){

var m = this.getTime() + milliseconds;

return new Date(m);

};

Date.prototype.addSeconds = function(second){

return this.add(second * 1000);

};

Date.prototype.addMinutes = function(minute){

return this.addSeconds(minute*60);

};

Date.prototype.addHours = function(hour){

return this.addMinutes(60*hour);

};

Date.prototype.addDays = function(day){

return this.addHours(day * 24);

};

Date.isLeepYear = function(year){

return (year % 4 == 0 && year % 100 != 0)

};

Date.daysInMonth = function(year,month){

if(month == 2){

if(year % 4 == 0 && year % 100 != 0)

return 29;

else

return 28;

}

else if((month <= 7 && month % 2 == 1) || (month > 7 && month % 2 == 0))

return 31;

else

return 30;

};

Date.prototype.addMonth = function(){

var m = this.getMonth();

if(m == 11)return new Date(this.getFullYear() + 1,1,this.getDate(),this.getHours(),this.getMinutes(),this.getSeconds());

var daysInNextMonth = Date.daysInMonth(this.getFullYear(),this.getMonth() + 1);

var day = this.getDate();

if(day > daysInNextMonth){

day = daysInNextMonth;

}

return new Date(this.getFullYear(),this.getMonth() + 1,day,this.getHours(),this.getMinutes(),this.getSeconds());

};

Date.prototype.subMonth = function(){

var m = this.getMonth();

if(m == 0)return new Date(this.getFullYear() -1,12,this.getDate(),this.getHours(),this.getMinutes(),this.getSeconds());

var day = this.getDate();

var daysInPreviousMonth = Date.daysInMonth(this.getFullYear(),this.getMonth());

if(day > daysInPreviousMonth){

day = daysInPreviousMonth;

}

return new Date(this.getFullYear(),this.getMonth() - 1,day,this.getHours(),this.getMinutes(),this.getSeconds());

};

Date.prototype.addMonths = function(addMonth){

var result = false;

if(addMonth > 0){

while(addMonth > 0){

result = this.addMonth();

addMonth -- ;

}

}else if(addMonth < 0){

while(addMonth < 0){

result = this.subMonth();

addMonth ++ ;

}

}else{

result = this;

}

return result;

};

Date.prototype.addYears = function(year){

return new Date(this.getFullYear() + year,this.getMonth(),this.getDate(),this.getHours(),this.getMinutes(),this.getSeconds());

};

var d = new Date();

alert('d.addYears(2) = ' + d.addYears(2).toLocaleString());

alert('d.addMonths(2) = ' + d.addMonths(2).toLocaleString());

alert('d.addMonths(-2) = ' + d.addMonths(-2).toLocaleString());

alert('d.addDays(2) = ' + d.addDays(2).toLocaleString());

alert('d.addHours(2) = ' + d.addHours(2).toLocaleString());

alert('d.addMinutes(2) = ' + d.addMinutes(2).toLocaleString());

alert('d.addSeconds(2) = ' + d.addSeconds(2).toLocaleString());

</script>

</body>

</html>

希望这个东西可以对大家有点用处。