使用:

var str = “ruby java”; console.log(str.charAt(0).toUpperCase() + str.substring(1));

它将输出“Ruby java”到控制台。

我需要做一个完整的名字资本化,如阿米尔·迪亚菲(Amir Diafi),所以我分裂了链条,以获得这些名字的序列,并资本化了每个字母的第一字母。

const value = 'amir diafi karim mohammed' const splited_names = value.split(' ') let capitalizedValue = '' for (const iterator of splited_names) { capitalizedValue += ` ${iterator.charAt(0).toUpperCase()}${iterator.slice(1)}` } capitalizedValue.trim() console.log(capitalizedValue) //amir diafi karim => Amir Diafi Karim

任何类型的字符串都可以转换 -

此分類上一篇: Yourstring

var str = yOuRsTrING.toLowerCase(); // Output: yourstring
str.charAt(0).toUpperCase() + str.slice(1); // Output: Y + ourstring = Yourstring

最简单的解决方案是:

let yourSentence = 'it needs first letter upper case';

yourSentence.charAt(0).toUpperCase() + yourSentence.substr(1);

或:

yourSentence.charAt(0).toUpperCase() + yourSentence.slice(1);

或:

yourSentence.substr(0, 1).toUpperCase() + yourSentence.substr(1);

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)

資本化和無資本化第一條線。

功能包括:

/** First Character uppercase */
function capitalize(str) {
    return str.charAt(0).toUpperCase() + str.slice(1);
}

/** First Character lowercase */
function uncapitalize(str) {
    return str.charAt(0).toLowerCase() + str.slice(1);
}

例1“第一个字符上方”:

alert(capitalize("hello world"));

标签:Hello World

示例2“第一字符下载案例”:

alert(uncapitalize("Hello World, today is sunny"));

此分類上一篇: Hello World, Today Is Sunny