JS generates a time list and outputs it

This time I will bring you JS to generate a time list and output it. What are the precautions for JS to generate a time list and output it? The following is a practical case, let's take a look.

Encountered a scenario where you need to get every day within the specified time range, satisfying the format "YYYYMMDD", simple function, simple idea

Preparation

Date

ObjectThere are many methods, the following are used:

new date () generates a date object, you can directly specify the year, month, day, etc., new date(year,month,day)

getFullYear() returns the year in the date object

getMonth() returns the month (0~11) in the date object, note that counting starts from 0

getDate() Returns the day in the date object. Note that counting starts from 1

getTime() Returns the number of milliseconds from January 1, 1970 to the date object

Analyze the specified range

It is specified in the yyyy-mm-dd format

StringEnter the time range and split it to get For the year, month and day of the start and end time, generate the corresponding date object and get the number of milliseconds

 let st = start.split('-');
 let et = end.split('-');
 let startTime = new Date(st[0],st[1]-1,st[2]).getTime();
 let endTime = new Date(et[0],et[1]-1,et[2]).getTime();

Note: The month needs to be subtracted by 1 because it starts from 0

Get every day

How to know which days are within the time range? The above has the number of milliseconds from the start and end time to 1970.1.1. Each day has 24 * 60 * 60 * 1000 milliseconds, so we can calculate each day by the number of milliseconds

  for( let i = startTime ; i <= endTime ; ){
    res.push(formatTime(i,&#39;&#39;));
    i += 24 * 60 * 60 * 1000;
  }

Formatted output

Format the time, fill in the ones digit with 0, and add the specified separator

function formatTime(time,spliter = '-'){
  let date = new Date(time);
  let year = date.getFullYear();
  let month = (date.getMonth() + 1) >= 10 ? (date.getMonth() + 1) : '0' + (date.getMonth() + 1);
  let day = date.getDate() >= 10 ? date.getDate() : '0' + date.getDate();
  return `${year}${spliter}${month}${spliter}${day}
}

Verification

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