Use js to calculate the difference in days between two dates

Convert both dates to milliseconds, then subtract them, and then convert the subtracted milliseconds to days to get the number of days between the two dates. (The accepted date format is "20201-1", "20201/1" and other date strings connected by connectors)

getDiffDay(date_1, date_2) {
    
    
  // 计算两个日期之间的差值
  let totalDays,diffDate
  let myDate_1 = Date.parse(date_1)
  let myDate_2 = Date.parse(date_2)
  // 将两个日期都转换为毫秒格式，然后做差
  diffDate = Math.abs(myDate_1 - myDate_2) // 取相差毫秒数的绝对值
 
  totalDays = Math.floor(diffDate / (1000 * 3600 * 24)) // 向下取整
  // console.log(totalDays)    
 
  return totalDays    // 相差的天数
}
 
// 使用
getDiffDay('2020-1-1', '2020-2-2')    // 32