Question

有点新的JavaScript，我正在尝试将序数信息添加到日期，例如4月4日我希望4月4日我只是使用下面的代码来获取日期编号，我将添加什么来获取序数信息

//Date
var d = new Date();
var n = d.getDate();    
document.getElementById("date").innerHTML = n;

Answer 1

我相信这只是该序数的英文短语中最右边的两个字母。由于你只对1到31之间的数字感兴趣，我只使用日期作为数组的索引：

var ordinalNames = [ "", "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", "ninth", "tenth", "eleventh", "twelfth", "thirteenth", "fourteenth", "fifteenth", "sixteenth", "seventeenth", "eighteenth", "nineteenth", "twentieth", "twenty-first", "twenty-second", "twenty-third", "twenty-fourth", "twenty-fifth", "twenty-sixth", "twenty-seventh", "twenty-eighth", "twenty-ninth", "thirtieth", "thirty-first" ];

var d = new Date();
var n = d.getDate();    
document.getElementById("date").innerHTML = n + ordinalNames[n].slice(-2);

Answer 2

有一种模式，你可以用它来制作一个功能

function nth(date) {
  if(date>=4 && date<=20) return 'th';
  switch (date % 10) {
        case 1:  return "st";
        case 2:  return "nd";
        case 3:  return "rd";
        default: return "th";
    }
}

添加到目前为止的序数信息

2 个答案: