这个解决方案将标点符号考虑到新句子中，处理引用，将小词转换为小写，忽略首字母缩写或全大写单词。

var stopWordsArray = new Array("a", "all", "am", "an", "and", "any", "are", "as", "at", "be", "but", "by", "can", "can't", "did", "didn't", "do", "does", "doesn't", "don't", "else", "for", "get", "gets", "go", "got", "had", "has", "he", "he's", "her", "here", "hers", "hi", "him", "his", "how", "i'd", "i'll", "i'm", "i've", "if", "in", "is", "isn't", "it", "it's", "its", "let", "let's", "may", "me", "my", "no", "of", "off", "on", "our", "ours", "she", "so", "than", "that", "that's", "thats", "the", "their", "theirs", "them", "then", "there", "there's", "these", "they", "they'd", "they'll", "they're", "they've", "this", "those", "to", "too", "try", "until", "us", "want", "wants", "was", "wasn't", "we", "we'd", "we'll", "we're", "we've", "well", "went", "were", "weren't", "what", "what's", "when", "where", "which", "who", "who's", "whose", "why", "will", "with", "won't", "would", "yes", "yet", "you", "you'd", "you'll", "you're", "you've", "your");

// Only significant words are transformed. Handles acronyms and punctuation
String.prototype.toTitleCase = function() {
    var newSentence = true;
    return this.split(/\s+/).map(function(word) {
        if (word == "") { return; }
        var canCapitalise = true;
        // Get the pos of the first alpha char (word might start with " or ')
        var firstAlphaCharPos = word.search(/\w/);
        // Check for uppercase char that is not the first char (might be acronym or all caps)
        if (word.search(/[A-Z]/) > 0) {
            canCapitalise = false;
        } else if (stopWordsArray.indexOf(word) != -1) {
            // Is a stop word and not a new sentence
            word.toLowerCase();
            if (!newSentence) {
                canCapitalise = false;
            }
        }
        // Is this the last word in a sentence?
        newSentence = (word.search(/[\.!\?:]['"]?$/) > 0)? true : false;
        return (canCapitalise)? word.replace(word[firstAlphaCharPos], word[firstAlphaCharPos].toUpperCase()) : word;
    }).join(' ');
}

// Pass a string using dot notation:
alert("A critical examination of Plato's view of the human nature".toTitleCase());
var str = "Ten years on: a study into the effectiveness of NCEA in New Zealand schools";
str.toTitleCase());
str = "\"Where to from here?\" the effectivness of eLearning in childhood education";
alert(str.toTitleCase());

/* Result:
A Critical Examination of Plato's View of the Human Nature.
Ten Years On: A Study Into the Effectiveness of NCEA in New Zealand Schools.
"Where to From Here?" The Effectivness of eLearning in Childhood Education. */

使用/\S+/g支持变音符:

function toTitleCase(str) replace str.replace(/\S+/g, str => str.charAt(0). toupbelise (str.substr, 1); 的 控制台(toTitleCase(“一个城市叫orebro”);-一个叫Orebro的城市

然而:“阳光(黄色)”⇒“阳光(黄色)”

惊讶地看到没有人提到rest参数的使用。下面是一个简单的使用ES6 Rest参数的程序。

让我们看《约翰·史密斯》 str = str。劈(“”)。([firstChar文件夹,...休息)= > firstChar toUpperCase() +休息。加入toLowerCase()(“”)。加入(“”) 控制台日志(str)。

下面是我的函数，它负责处理重音字符(对法语来说很重要!)，并且可以打开/关闭对lower异常的处理。希望这能有所帮助。

String.prototype.titlecase = function(lang, withLowers = false) {
    var i, string, lowers, uppers;

    string = this.replace(/([^\s:\-'])([^\s:\-']*)/g, function(txt) {
        return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();
    }).replace(/Mc(.)/g, function(match, next) {
        return 'Mc' + next.toUpperCase();
    });

    if (withLowers) {
        if (lang == 'EN') {
            lowers = ['A', 'An', 'The', 'At', 'By', 'For', 'In', 'Of', 'On', 'To', 'Up', 'And', 'As', 'But', 'Or', 'Nor', 'Not'];
        }
        else {
            lowers = ['Un', 'Une', 'Le', 'La', 'Les', 'Du', 'De', 'Des', 'À', 'Au', 'Aux', 'Par', 'Pour', 'Dans', 'Sur', 'Et', 'Comme', 'Mais', 'Ou', 'Où', 'Ne', 'Ni', 'Pas'];
        }
        for (i = 0; i < lowers.length; i++) {
            string = string.replace(new RegExp('\\s' + lowers[i] + '\\s', 'g'), function(txt) {
                return txt.toLowerCase();
            });
        }
    }

    uppers = ['Id', 'R&d'];
    for (i = 0; i < uppers.length; i++) {
        string = string.replace(new RegExp('\\b' + uppers[i] + '\\b', 'g'), uppers[i].toUpperCase());
    }

    return string;
}

只是另一个版本的混合。这也将检查字符串是否。长度为0:

String.prototype.toTitleCase = function() {
    var str = this;
    if(!str.length) {
        return "";
    }
    str = str.split(" ");
    for(var i = 0; i < str.length; i++) {
        str[i] = str[i].charAt(0).toUpperCase() + (str[i].substr(1).length ? str[i].substr(1) : '');
    }
    return (str.length ? str.join(" ") : str);
};

不使用正则表达式，仅供参考:

String.prototype.toProperCase = function() { Var =这个。分割(' '); Var结果= []; For (var I = 0;I < words.length;我+ +){ var letter = words[i].charAt(0).toUpperCase(); 结果。Push(字母+单词[i].slice(1)); ｝ 返回的结果。加入(' '); }; console.log ( “约翰·史密斯”.toProperCase () ）