此分類上一篇: I like this one:

yourString.replace(/(^[a-z])/i, (str, firstLetter) => firstLetter.toUpperCase())

一个小改进 - 每个字在标题。

String.prototype.toTitleCase = function(){
    return this.replace(/\b(\w+)/g, function(m,p){ return p[0].toUpperCase() + p.substr(1).toLowerCase() });
}

var s = 'heLLo, wOrLD!';
console.log(s.toTitleCase()); // Hello, World!

/*
 * As terse as possible, assuming you're using ES version 6+
 */
var upLetter1=s=>s.replace(/./,m=>m.toUpperCase());

console.log(upLetter1("the quick brown fox jumped over the lazy dog."));
//\\ The quick brown fox jumped over the lazy dog. //\\

您可以使用 String#chatAt 获取第一个字符,将其转向上方,然后将其与链条的剩余部分相结合。

function capitalizeFirstLetter(v) {
  return v.charAt(0).toUpperCase() + v.substring(1);
}

下面是我所使用的功能:

capitalCase(text: string = 'NA') {
    return text
      .trim()
      .toLowerCase()
      .replace(/\w\S*/g, (w) => w.replace(/^\w/, (c) => c.toUpperCase()));
  }

console.log('this cApitalize TEXt');

功能性方法

const capitalize = ([s, ...tring]) =>
  [s.toUpperCase(), ...tring]
    .join('');

然后你可以

const titleCase = str => 
  str
    .split(' ')
    .map(capitalize)
    .join(' ')