getDaysNumber(date){
let curDate = new Date(Date.parse(date.replace(/-/g,"/")));;
let y = curDate.getFullYear();
let m = curDate.getMonth() + 1;//本身就得+1才等于当前月份，然而我要计算下一个月，所以直接+2
if( m > 12 ){
m = 1;
y++ 
}else if(m<1){
m = 12;
y--
}
let monthLastDay = new Date(y,m,0).getDate();
return monthLastDay;
},

　获取一个月的第一天和最后一天

setDate(date,number){
let curDate = new Date(Date.parse(date.replace(/-/g,"/")));;
let y = curDate.getFullYear();
let m = curDate.getMonth() + number;//本身就得+1才等于当前月份，然而我要计算下一个月，所以直接+2
if( m > 12 ){
m = 1;
y++ 
}else if(m<1){
m = 12;
y--
}
let monthLastDay = new Date(y,m,0).getDate();
let syqxks = y + '-' + (m < 10 ? '0'+m : m) + '-' + '01';
let syqxjs = y + '-' + (m < 10 ? '0'+m : m) + '-' + (monthLastDay < 10 ? '0'+monthLastDay : monthLastDay);
return { firstday: syqxks, lastday: syqxjs }
},