在 CoffeeScript 中,添加一个字符串的原型:

String::capitalize = ->
  @substr(0, 1).toUpperCase() + @substr(1)

使用将是:

"woobie".capitalize()

谁得益:

"Woobie"

尝试下列功能:

function capitalize (string) {
  return [].map.call(string, (char, i) => i ? char : char.toUpperCase()).join('')
}

使用:

capitalize('hello, world!')

结果:

Hello, world!

var capitalizeMe = "string not starting with capital"

资本化与substr

var capitalized = capitalizeMe.substr(0, 1).toUpperCase() + capitalizeMe.substr(1);

如果您想修改全覆文本,您可能希望修改其他例子如下:

function capitalize (text) {
    return text.charAt(0).toUpperCase() + text.slice(1).toLowerCase();
}

这将确保下列文本进行更改:

TEST => Test
This Is A TeST => This is a test

如果我可以稍微改变代码,我发现,如果我通过这个功能运行一条所有条线,什么都不会发生,所以......这里是我的条线。

String.prototype.capitalize = function(){
    return this.toLowerCase().replace( /(^|\s)([a-z])/g , function(m, p1, p2) {
        return p1 + p2.toUpperCase();
    });
}

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

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