如果你想在一行中资本化每个第一封信,例如Hello to the world,你可以使用以下(由史蒂夫·哈里森重复):

function capitalizeEveryFirstLetter(string) {
    var splitStr = string.split(' ')
    var fullStr = '';

    $.each(splitStr,function(index){
        var currentSplit = splitStr[index].charAt(0).toUpperCase() + splitStr[index].slice(1);
        fullStr += currentSplit + " "
    });

    return fullStr;
}

您可以通过使用以下方式呼叫:

capitalizeFirstLetter("hello to the world");

只是因为你可以,这并不意味着你应该,但是. 它需要 ECMAScript 6 因为代码使用序列破坏。

const capitalizeFirstLetter = s => {
  const type = typeof s;
  if (type !== "string") {
    throw new Error(`Expected string, instead received ${type}`);
  }

  const [firstChar, ...remainingChars] = s;

  return [firstChar.toUpperCase(), ...remainingChars].join("");
};

如同它:

function capitalize(string,a) {
    var tempstr = string.toLowerCase();
    if (a == false || a == undefined)
        return tempstr.replace(tempstr[0], tempstr[0].toUpperCase());
    else {
        return tempstr.split(" ").map(function (i) { return i[0].toUpperCase() + i.substring(1) }).join(" ");
    }
}


capitalize('stack overflow yeah!',true)); //Stack Overflow Yeah!

capitalize('stack stack stack stack overflow yeah!'));//Stack overflow yeah!

https://jsfiddle.net/dgmLgv7b/

这就是同样的行动:

var newStr = string.slice(0,1).toUpperCase() + string.slice(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');

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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