JS获取当前周的第一天和最后一天

话不多说，直接贴代码

var getDays = function ()
{
var now = new Date;
var day = now.getDay ();
var week = "7123456";
var first = 0 - week.indexOf (day);
var f = new Date;
f.setDate (f.getDate () + first);
var last = 6 - week.indexOf (day);
var l = new Date;
l.setDate (l.getDate () + last);
return [
f, l
];
}
console.log(getDays ())