带有箭功能

let fLCapital = s => s.replace(/./, c => c.toUpperCase())
fLCapital('this is a test') // "This is a test"

用火箭功能,另一种解决方案

let fLCapital = s => s = s.charAt(0).toUpperCase() + s.slice(1);
fLCapital('this is a test') // "This is a test"

与 Array 和 地图()

let namesCapital = names => names.map(name => name.replace(/./, c => c.toUpperCase()))
namesCapital(['james', 'robert', 'mary']) // ["James", "Robert", "Mary"]

String.prototype.capitalize = function(allWords) {
   return (allWords) ? // If all words
      this.split(' ').map(word => word.capitalize()).join(' ') : // Break down the phrase to words and then recursive
                                                                 // calls until capitalizing all words
      this.charAt(0).toUpperCase() + this.slice(1); // If allWords is undefined, capitalize only the first word,
                                                    // meaning the first character of the whole string
}

然后:

 "capitalize just the first word".capitalize(); ==> "Capitalize just the first word"
 "capitalize all words".capitalize(true); ==> "Capitalize All Words"

更新2016年11月(ES6),只是为了乐趣:

const capitalize = (string = '') => [...string].map(    // Convert to array with each item is a char of
                                                        // string by using spread operator (...)
    (char, index) => index ? char : char.toUpperCase()  // Index true means not equal 0, so (!index) is
                                                        // the first character which is capitalized by
                                                        // the `toUpperCase()` method
 ).join('')                                             // Return back to string

此分類上一篇: 你好(Hello)

s[0].toUpperCase``+s.substr`1`

let s = 'hello there' console.log( s[0].toUpperCase''+s.substr`1` )

如果你去其中一个 regex 答案,请记住,它们只会与 ASCII 字符一起工作. 所有的 Unicode 字母都不会被打破. XRegExp 图书馆和其 Unicode 插件解决这个问题,如果你想与 regex 保持。

String.prototype.capitalize = function () {
    return this.replace(XRegExp("^\\p{L}"), function ($0) { return $0.toUpperCase(); })
}

考虑到它仍然不涵盖所有可能性(混合字符,见 http://www.regular-expressions.info/unicode.html),似乎更容易使用.charAt(0).toUpperCase() 方法。

这是一个简单的

const upper = lower.replace(/^\w/, c => c.toUpperCase());

/*
 * 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. //\\