JavaScript代码应仅返回当前一周的日期，但跳过第二天

Question

My JavaScript code is expected to return days of the current week only, but skips the second day.

Here is the code:

 var curr = new Date; var first = curr.getDate() - curr.getDay(); var first = first + 1; var second = first + 2; var third = first + 3; var fourth = first + 4; var fifth = first + 5; var last = first + 6; var monday = new Date(curr.setDate(first)).toLocaleDateString(); var tuesday = new Date(curr.setDate(second)).toLocaleDateString(); var wednesday = new Date(curr.setDate(third)).toLocaleDateString(); var thursday = new Date(curr.setDate(fourth)).toLocaleDateString(); var friday = new Date(curr.setDate(fifth)).toLocaleDateString(); var sunday = new Date(curr.setDate(last)).toLocaleDateString(); //alert(monday+" "+sunday) document.write(monday + " " + tuesday + " " + wednesday + " " + thursday + " " + friday + " " + sunday) 

this is my output: 5/13/2019 5/15/2019 5/16/2019 5/17/2019 5/18/2019 5/19/2019 ...notice 5/14/2019 is missing, could I get some help with this please?

Answer 1

as day 'zero' is Sunday You may have :

 var curr = new Date; var zero = curr.getDate() - curr.getDay(); // Sunday - Saturday : 0 - 6 var first = zero + 1; var second = zero + 2; var third = zero + 3; var fourth = zero + 4; var fifth = zero + 5; var last = zero + 6; var monday = new Date(curr.setDate(first)).toLocaleDateString(); var tuesday = new Date(curr.setDate(second)).toLocaleDateString(); var wednesday = new Date(curr.setDate(third)).toLocaleDateString(); var thursday = new Date(curr.setDate(fourth)).toLocaleDateString(); var friday = new Date(curr.setDate(fifth)).toLocaleDateString(); var saturday = new Date(curr.setDate(last)).toLocaleDateString(); document.write( 'monday.....', monday , '<br>' ) document.write( 'tuesday....', tuesday , '<br>' ) document.write( 'wednesday..', wednesday , '<br>' ) document.write( 'thursday...', thursday , '<br>' ) document.write( 'friday.....', friday , '<br>' ) document.write( 'saturday...', saturday , ' ==> ( not sunday ) <br>' ) 

 body { font-family: 'Courier New', Courier, monospace; } 

Answer 2

You are adding 1 to your first day, then incrementing from there incorrectly.

 var curr = new Date; var first = curr.getDate() - curr.getDay(); var monday = new Date(curr.setDate(first+1)).toLocaleDateString(); var tuesday = new Date(curr.setDate(first+2)).toLocaleDateString(); var wednesday = new Date(curr.setDate(first+3)).toLocaleDateString(); var thursday = new Date(curr.setDate(first+4)).toLocaleDateString(); var friday = new Date(curr.setDate(first+5)).toLocaleDateString(); var saturday = new Date(curr.setDate(first+6)).toLocaleDateString(); //alert(monday+" "+sunday) document.write(monday + " " + tuesday + " " + wednesday + " " + thursday + " " + friday + " " + saturday) 

Answer 3

You are changing first , and then start adding to it.

Consider this code:

var n = 0;
var n = n+1;
var n2 = n+2;

you will end up with n == 1 and n2 == 3 .

Also, if you were using let instead of var , JavaScript would have caught this error for you.