强烈推荐优秀的date-fns库。快速，模块化，不可变，适用于标准日期。

import * as DateFns from 'date-fns';

const ordinalInt = DateFns.format(someInt, 'do');

参见date-fns docs: https://date-fns.org/v2.0.0-alpha.9/docs/format

这是为一个内衬和爱好者的es6

let i= new Date().getDate 

// I can be any number, for future sake we'll use 9

const j = I % 10;
const k = I % 100;

i = `${i}${j === 1 &&  k !== 11 ? 'st' : j === 2 && k !== 12 ? 'nd' : j === 3 && k !== 13 ? 'rd' : 'th'}`}

console.log(i) //9th

+be number的另一个选项是:

console.log(["st","nd","rd"][((i+90)%100-10)%10-1]||"th"]

也可以用这些来去掉序数前缀:

console.log(i.parseInt("8th"))

console.log(i.parseFloat("8th"))

请随意修改以适合您的需要

从Shopify

函数getNumberWithOrdinal(n) { Var s = ["th"， "st"， "nd"， "rd"]， V = n % 100; 返回n + (s[(v - 20) % 10] || s[v] || s[0]); ｝ [4 1, 0, 1, 2, 3, 4, 10, 11, 12日,13日,14日,20日,21日,22100101111].forEach ( n => console.log(n + ' -> ' + getNumberWithOrdinal(n)) ）;

const getOrdinalNum = (n) => n + (n > 0 ? ['th', 'st', 'nd', 'rd'][(n > 3 && n < 21) || n % 10 > 3 ? 0 : n % 10] : '');

你只有12天?我想让它只是一个简单的查找数组:

var suffixes = ['','st','nd','rd','th','th','th','th','th','th','th','th','th'];

然后

var i = 2;
var day = i + suffixes[i]; // result: '2nd'

or

var i = 8;
var day = i + suffixes[i]; // result: '8th'

我强烈推荐这本书，它超级简单易懂。希望有帮助?

它避免使用负整数，即小于1的数字并返回false 如果输入为0，则返回0

function numberToOrdinal(n) {

  let result;

  if(n < 0){
    return false;
  }else if(n === 0){
    result = "0";
  }else if(n > 0){

    let nToString = n.toString();
    let lastStringIndex = nToString.length-1;
    let lastStringElement = nToString[lastStringIndex];

    if( lastStringElement == "1" && n % 100 !== 11 ){
      result = nToString + "st";
    }else if( lastStringElement == "2" && n % 100 !== 12 ){
      result = nToString + "nd";
    }else if( lastStringElement == "3" && n % 100 !== 13 ){
      result = nToString + "rd";
    }else{
      result = nToString + "th";
    }

  }

  return result;
}

console.log(numberToOrdinal(-111));
console.log(numberToOrdinal(0));
console.log(numberToOrdinal(11));
console.log(numberToOrdinal(15));
console.log(numberToOrdinal(21));
console.log(numberToOrdinal(32));
console.log(numberToOrdinal(43));
console.log(numberToOrdinal(70));
console.log(numberToOrdinal(111));
console.log(numberToOrdinal(300));
console.log(numberToOrdinal(101));

输出

false
0
11th
15th
21st
32nd
43rd
70th
111th
300th
101st