一个可能的解决方案:

function ConvertFirstCharacterToUpperCase(text) {
    return text.substr(0, 1).toUpperCase() + text.substr(1);    
}

使用此:

 alert(ConvertFirstCharacterToUpperCase("this is string"));

此分類上一篇: JS Fiddle

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"

如果您的项目中有Lodash,请使用UpperFirst

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);

发表一个编辑 @salim 的答案,包括本地字母转换。

var str = "test string";
str = str.substring(0,1).toLocaleUpperCase() + str.substring(1);

var nameP = prompt("please enter your name");
var nameQ = nameP.slice(0,1);
var nameR = nameP.slice(1,100);
nameQ = nameQ.toUpperCase();
nameP = nameQ + nameR;
console.log("Hello! " + nameP);

出口:

Hello! Alex