试试这个函数:

const capitializeName = (name) => {
 
     const splitName = name.split(' ');
        const namesUpper = [];

    for (const n of splitName) {
        namesUpper.push(n[0].toUpperCase() + n.slice(1));
    }
    console.log(namesUpper.join(' '));
};

capitializeName('jahid bhuiyan');

原始代码:

function capi(str) {
    var s2 = str.trim().toLowerCase().split(' ');
    var s3 = [];
    s2.forEach(function(elem, i) {
        s3.push(elem.charAt(0).toUpperCase().concat(elem.substring(1)));
    });
    return s3.join(' ');
}
capi('JavaScript string exasd');

这里有一个简单的一行代码

const ucFirst = t => t.replace(/(^|\s)[A-Za-zÀ-ÖØ-öø-ÿ]/g, c => c.toUpperCase());

注意，它只改变每个单词的首字母大小写，你可能想这样使用它:

console.log(ucFirst('foO bAr'));
// FoO BAr

console.log(ucFirst('foO bAr'.toLowerCase()));
// Foo Bar

// works with accents too
console.log(ucFirst('éfoO bAr'));
// ÉfoO BAr

或者基于String。这里的原型是一个处理几种模式:

String.prototype.ucFirst = function (mode = 'eachWord') {
  const modes = {
    eachWord: /(^|\s)[A-Za-zÀ-ÖØ-öø-ÿ]/g,
    firstWord: /(^|\s)[A-Za-zÀ-ÖØ-öø-ÿ]/,
    firstChar: /^[A-Za-zÀ-ÖØ-öø-ÿ]/,
    firstLetter: /[A-Za-zÀ-ÖØ-öø-ÿ]/,
  };

  if (mode in modes) {
    return this.replace(modes[mode], c => c.toUpperCase());
  } else {
    throw `error: ucFirst invalid mode (${mode}). Parameter should be one of: ` + Object.keys(modes).join('|');
  }
};

console.log('eachWord', 'foO bAr'.ucFirst());
// FoO BAr

console.log('eachWord', 'foO bAr'.toLowerCase().ucFirst());
// Foo Bar

console.log('firstWord', '1foO bAr'.ucFirst('firstWord'));
// 1foO BAr

console.log('firstChar', '1foO bAr'.ucFirst('firstChar'));
// 1foO bAr

console.log('firstLetter', '1foO bAr'.ucFirst('firstLetter'));
// 1FoO bAr

编辑:

或者基于String。处理多种模式和可选的第二个参数来指定单词分隔符(String或RegExp)的原型:

String.prototype.ucFirst = function (mode = 'eachWord', wordSeparator = /\s/) {
  const letters = /[A-Za-zÀ-ÖØ-öø-ÿ]/;
  const ws =
    '^|' +
    (wordSeparator instanceof RegExp
      ? '(' + wordSeparator.source + ')'
      : // sanitize string for RegExp https://stackoverflow.com/questions/3446170/escape-string-for-use-in-javascript-regex#comment52837041_6969486
        '[' + wordSeparator.replace(/[[{}()*+?^$|\]\.\\]/g, '\\$&') + ']');

  const r =
    mode === 'firstLetter'
      ? letters
      : mode === 'firstChar'
      ? new RegExp('^' + letters.source)
      : mode === 'firstWord' || mode === 'eachWord'
      ? new RegExp(
          '(' + ws + ')' + letters.source,
          mode === 'eachWord' ? 'g' : undefined
        )
      : undefined;

  if (r) {
    return this.replace(r, (c) => c.toUpperCase());
  } else {
    throw `error: ucFirst invalid mode (${mode}). Parameter should be one of: firstLetter|firstChar|firstWord|eachWord`;
  }
};

console.log("mike o'hara".ucFirst('eachWord', " \t\r\n\f\v'"));
// Mike O'Hara
console.log("mike o'hara".ucFirst('eachWord', /[\s']/));
// Mike O'Hara

这里我使用了三个函数toLowerCase()， toUpperCase()和replace(regex,replacer)

function titleCase(str) { 
     return str.toLowerCase().replace(/^(\w)|\s(\w)/g, (grp) => grp.toUpperCase()); 
}

titleCase(“我是一个小茶壶”);

我认为这条路会快一些;因为它不会拆分字符串并重新连接;只是用正则表达式。

var str = text.toLowerCase().replace(/(^\w{1})|(\s{1}\w{1})/g, match => match.toUpperCase());

解释:

(^\w{1}):匹配字符串的第一个字符 |:或者 (\s{1}\w{1}):匹配一个空格后面的一个字符 G:全部匹配 match => match. touppercase (): replace with can take function, so;将匹配替换为大写匹配

function titleCase(str) { //First of all, lets make all the characters lower case let lowerCaseString = ""; for (let i = 0; i < str.length; i++) { lowerCaseString = lowerCaseString + str[i].toLowerCase(); } //Now lets make the first character in the string and the character after the empty character upper case and leave therest as it is let i = 0; let upperCaseString = ""; while (i < lowerCaseString.length) { if (i == 0) { upperCaseString = upperCaseString + lowerCaseString[i].toUpperCase(); } else if (lowerCaseString[i - 1] == " ") { upperCaseString = upperCaseString + lowerCaseString[i].toUpperCase(); } else { upperCaseString = upperCaseString + lowerCaseString[i]; } i = i + 1; } console.log(upperCaseString); return upperCaseString; } titleCase("hello woRLD");