dateAdd与DateDiff函数的js代码

DateAdd函数：

function DateAdd(interval,number,date){

switch(interval.toLowerCase()){

case "y": return new Date(date.setFullYear(date.getFullYear()+number));

case "m": return new Date(date.setMonth(date.getMonth()+number));

case "d": return new Date(date.setDate(date.getDate()+number));

case "w": return new Date(date.setDate(date.getDate()+7*number));

case "h": return new Date(date.setHours(date.getHours()+number));

case "n": return new Date(date.setMinutes(date.getMinutes()+number));

case "s": return new Date(date.setSeconds(date.getSeconds()+number));

case "l": return new Date(date.setMilliseconds(date.getMilliseconds()+number));

}

}

DateDiff函数：

function DateDiff(interval,date1,date2){

var long = date2.getTime() - date1.getTime(); //相差毫秒

switch(interval.toLowerCase()){

case "y": return parseInt(date2.getFullYear() - date1.getFullYear());

case "m": return parseInt((date2.getFullYear() - date1.getFullYear())*12 + (date2.getMonth()-date1.getMonth()));

case "d": return parseInt(long/1000/60/60/24);

case "w": return parseInt(long/1000/60/60/24/7);

case "h": return parseInt(long/1000/60/60);

case "n": return parseInt(long/1000/60);

case "s": return parseInt(long/1000);

case "l": return parseInt(long);

}

}