js Method for Calculating the Day of the Week of the System's Current Date

In this paper, we share four methods for calculating the current date of the week of js system for your reference. The specific contents are as follows

Method 1:

//  What day of the week is the computing system currently 
var str = " Today is a week " + " Day 123456".charat(new date().getday());

Method 2:

var a = new array(" Day ", "1", "2", "3", "4", "5", "6");
var week = new date().getday();
var str = " Today is a week "+ a[week];
alert(str);

Method 3:

var str = " Today is a week ";
var week = new date().getday();
switch (week) {
  case 0 :
    str1 += " Day ";
    break;
  case 1 :
    str1 += "1";
    break;
  case 2 :
    str1 += "2";
    break;
  case 3 :
    str1 += "3";
    break;
  case 4 :
    str1 += "4";
    break;
  case 5 :
    str1 += "5";
    break;
  case 6 :
    str1 += "6";
    break;
}
alert(str);

Method 4:

var str = "";
var week = new date().getday();
if (week == 0) {
  str = " Today is Sunday ";
} else if (week == 1) {
  str = " Today is a week 1";
} else if (week == 2) {
  str = " Today is a week 2";
} else if (week == 3) {
  str = " Today is a week 3";
} else if (week == 4) {
  str = " Today is a week 4";
} else if (week == 5) {
  str = " Today is a week 5";
} else if (week == 6) {
  str = " Today is a week 6";
}
alert(str);