javascript-日期月份增减

/**
 * 设定新日期
 * @param _dateObject 日期对象
 * @param x 加减月份
 */			
function getNewDate(_dateObject,x){
	if( _dateObject == null || undefined == _dateObject || _dateObject == ''){
		_dateObject = new Date();
	}

	_dateObject.setMonth(_dateObject.getMonth() + x);

	//返回日期的毫秒表示
	var nd = _dateObject.valueOf() ;
	nd = new Date(nd);
	
	var y = nd.getFullYear();
	var m = nd.getMonth() + 1;
	var d = nd.getDate();
	
	if(m <= 9) m = "0" + m;
	if(d <= 9) d = "0" + d; 
	var cdate = y + "-" + m ;
	
	return cdate;
}

 

getNewDate(new Date() ,-2);//当前月份-2