常用js 时间函数

var d = new Date();
d.setDate(1);
var first_day = d.getFullYear() + '-' + (d.getMonth() +1) + '-' + d.getDate();
d.setMonth(d.getMonth() +1);
d.setDate(0);
var last_day = d.getFullYear() + '-' + (d.getMonth() +1) + '-' + d.getDate();

console.log(first_day);
console.log(last_day);

var d = new Date();
var n = d.getDay();
var f = d.getDate() - n + 1;
var l = d.getDate() + 7 - n;
d.setDate(f);
var first_day = d.getFullYear() + '-' + (d.getMonth() +1) + '-' + d.getDate();
d.setDate(l);
var last_day = d.getFullYear() + '-' + (d.getMonth() +1) + '-' + d.getDate();

console.log(first_day);
console.log(last_day);