常用的js处理方法(数字每隔三位加逗号分开，日期)

function FormatNum(str){
var str = ''+str;
var newStr = "";
var count = 0;

if(str.indexOf(".")==-1){
for(var i=str.length-1;i>=0;i--){
if(count % 3 == 0 && count != 0){
newStr = str.charAt(i) + "," + newStr;
}else{
newStr = str.charAt(i) + newStr;
}
count++;
}
//str = newStr + ".00"; //自动补小数点后两位
str = newStr;
}
else
{
for(var i = str.indexOf(".")-1;i>=0;i--){
if(count % 3 == 0 && count != 0){
newStr = str.charAt(i) + "," + newStr;
}else{
newStr = str.charAt(i) + newStr; //逐个字符相接起来
}
count++;
}
str = newStr + (str + "00").substr((str + "00").indexOf("."),3);
}
return str;
}

/*@description：获取星期几
* @param: 当前周几的基础上，往后加多少天，若为空则表示当天是周几
* */
function getWeek(param){
var param = param==undefined?0:param;
var date = new Date();
var day = date.getDay();
var week=['周日','周一','周二','周三','周四','周五','周六'];
var add=parseInt((day+param))%7;
return week[add];
}

/*@description：获取年月日 yyyy-mm-dd
* @param: 当前日期的基础上，往后加多少天，若为空则表示当天
* */
function getYMD(param){
var param = param==undefined?0:param;
var seperator1 = "-";
var date = new Date();
date.setDate(date.getDate()+param);
var year = date.getFullYear();
var month = parseInt(date.getMonth() + 1);
month = month<10?'0'+month:month;
var strDate = parseInt(date.getDate());
strDate = strDate<10?'0'+strDate:strDate;
var strdate = year + seperator1 + month + seperator1 + strDate;
return strdate;
}

/*@description：获取当前时间 yyyy-mm-dd hh:mm:ss
* */
function getNowFormatDate() {
var date = new Date();
var seperator1 = "-";
var seperator2 = ":";
var year = date.getFullYear();
var month = date.getMonth() + 1;
var second = date.getSeconds();
var strDate = date.getDate();
if (month >= 1 && month <= 9) {
month = "0" + month;
}
if (second <= 9) {
second = "0" + second;
}
if (strDate >= 0 && strDate <= 9) {
strDate = "0" + strDate;
}
var currentdate = year + seperator1 + month + seperator1 + strDate
+ " " + date.getHours() + seperator2 + date.getMinutes()
+ seperator2 + second;
return currentdate;
}