What is the day of the week in javascript?

In Javascript, the operation of indicating the day of the week can be implemented using the relevant methods of the Date object. The Date object is Javascript's built-in date and time class. It provides many date and time related methods and properties, including getting the current time, setting the date and time, getting the timestamp, and so on.

Among them, the method that represents the day of the week is getDay(), which can get the day of the week that the current date is. This method returns the numeric code for the day of the week, from 0 to 6, representing Sunday through Saturday.

A common usage is to convert the numeric code into a text description of the day of the week through a switch statement, for example:

let date = new Date();
let day = date.getDay();

switch(day){
  case 0:
    console.log("今天是星期日");
    break;
  case 1:
    console.log("今天是星期一");
    break;
  case 2:
    console.log("今天是星期二");
    break;
  case 3:
    console.log("今天是星期三");
    break;
  case 4:
    console.log("今天是星期四");
    break;
  case 5:
    console.log("今天是星期五");
    break;
  case 6:
    console.log("今天是星期六");
    break;
}

In addition to the getDay() method, there are many other related methods that can be used Represents the week, month, year, etc., such as getMonth(), getFullYear(), etc. Use these methods to conveniently operate date and time and implement various functions.

It should be noted that the method of expressing the week in Javascript uses a 0-based numeric code, which is inconsistent with our common order from Monday to Sunday. Therefore, you need to pay attention to the correspondence when programming to avoid misunderstandings.

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