如果你可以在你的代码中使用第三方库，那么lodash为我们提供了一个帮助函数。

https://lodash.com/docs/4.17.3#startCase

_。startCase (foo栏); // => 'Foo Bar' _.startCase(“——foo bar”); // => 'Foo Bar' _.startCase(“fooBar”); // => 'Foo Bar' _.startCase(“__FOO_BAR__”); // => ' foo bar '

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. */

试试这个:

function toTitleCase(str) str归来。replace ( - w \ S * / g, 功能(. txt) { 归来txt.charAt(0). toupfaith (+ txt.substr) 的 ); 的 < form > 输入: <br /><textarea" > < / textarea > < br / >输出: <br /><textarea" > < / textarea > < / form >

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”);

这是我的版本，在我看来很容易理解，也很优雅。

Const STR = "foo bar baz"; const newStr = str.split(' ') .map(w => w[0].toUpperCase() + w.substring(1).toLowerCase()) . join (' '); console.log (newStr);

Var结果= “这很有趣”。/\b[a-z]/g， (x) => x. touppercase ()) console.log(result) // This Is Very Interesting