一个使用lodash -的解决方案

import { words, lowerCase, capitalize, endsWith, padEnd } from 'lodash';
const titleCase = string =>
  padEnd(
    words(string, /[^ ]+/g)
      .map(lowerCase)
      .map(capitalize)
      .join(' '),
    string.length,
  );

与John Resig的解决方案一样功能齐全，但作为一行程序:(基于此github项目)

function toTitleCase(e){var t=/^(a|an|and|as|at|but|by|en|for|if|in|of|on|or|the|to|vs?\.?|via)$/i;return e.replace(/([^\W_]+[^\s-]*) */g,function(e,n,r,i){return r>0&&r+n.length!==i.length&&n.search(t)>-1&&i.charAt(r-2)!==":"&&i.charAt(r-1).search(/[^\s-]/)<0?e.toLowerCase():n.substr(1).search(/[A-Z]|\../)>-1?e:e.charAt(0).toUpperCase()+e.substr(1)})};

console.log( toTitleCase( "ignores mixed case words like iTunes, and allows AT&A and website.com/address etc..." ) );

实现类似功能的另一种方法如下所示。

formatName(name) {
    let nam = '';
    name.split(' ').map((word, index) => {
        if (index === 0) {
            nam += word.split('').map((l, i) => i === 0 ? l.toUpperCase() : l.toLowerCase()).join('');
        } else {
            nam += ' ' + word.split('').map(l => l.toLowerCase()).join('');
        }
    });
    return nam;
}

下面是我的函数，它转换为标题大小写，但也保留了定义的首字母缩写为大写，小词为小写:

String.prototype.toTitleCase = function() {
  var i, j, str, lowers, uppers;
  str = this.replace(/([^\W_]+[^\s-]*) */g, function(txt) {
    return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();
  });

  // Certain minor words should be left lowercase unless 
  // they are the first or last words in the string
  lowers = ['A', 'An', 'The', 'And', 'But', 'Or', 'For', 'Nor', 'As', 'At', 
  'By', 'For', 'From', 'In', 'Into', 'Near', 'Of', 'On', 'Onto', 'To', 'With'];
  for (i = 0, j = lowers.length; i < j; i++)
    str = str.replace(new RegExp('\\s' + lowers[i] + '\\s', 'g'), 
      function(txt) {
        return txt.toLowerCase();
      });

  // Certain words such as initialisms or acronyms should be left uppercase
  uppers = ['Id', 'Tv'];
  for (i = 0, j = uppers.length; i < j; i++)
    str = str.replace(new RegExp('\\b' + uppers[i] + '\\b', 'g'), 
      uppers[i].toUpperCase());

  return str;
}

例如:

"TO LOGIN TO THIS SITE and watch tv, please enter a valid id:".toTitleCase();
// Returns: "To Login to This Site and Watch TV, Please Enter a Valid ID:"

你可以立即toLowerCase字符串，然后只是toUpperCase每个单词的第一个字母。变成了非常简单的一行:

函数titleCase(str) { 返回str.toLowerCase()。/\b\w/g, s => s. touppercase ()); ｝ console.log (titleCase(‘钢铁侠’); console.log (titleCase(“绿巨人”);

更简单的高性能版本，具有简单的缓存。

var TITLE_CASE_LOWER_MAP = { 'a': 1, 'an': 1, 'and': 1, 'as': 1, 'at': 1, 'but': 1, 'by': 1, 'en':1, 'with': 1, 'for': 1, 'if': 1, 'in': 1, 'of': 1, 'on': 1, 'the': 1, 'to': 1, 'via': 1 }; // LEAK/CACHE TODO: evaluate using LRU. var TITLE_CASE_CACHE = new Object(); toTitleCase: function (title) { if (!title) return null; var result = TITLE_CASE_CACHE[title]; if (result) { return result; } result = ""; var split = title.toLowerCase().split(" "); for (var i=0; i < split.length; i++) { if (i > 0) { result += " "; } var word = split[i]; if (i == 0 || TITLE_CASE_LOWER_MAP[word] != 1) { word = word.substr(0,1).toUpperCase() + word.substr(1); } result += word; } TITLE_CASE_CACHE[title] = result; return result; },