如何将字符串大写？[副本]

Question

我使用JavaScript创建了以下字符串：

let str = "my city is beautiful."

我想得到：

"My City Is Beautiful"

我试过这个：

str.charAt(0).toUpperCase() + str.slice(1)

但我得到了：

My city is beautiful

你能帮我吗？

Answer 1

使用map和join。

let str = "my city is beautiful."

var newStr = str.split(" ").map( str =>  str.substring(0,1).toUpperCase()+ str.substring(1)).join(' ')

console.log(newStr)

Answer 2

const string = "my city is beautiful.";
const words = string.split(" ");

for (let i = 0; i < words.length; i++) {
    words[i] = words[i][0].toUpperCase() + words[i].substr(1);
}

let newString = words.join(" ");

Answer 3

您可以使用split、map和join：

"my city is beautiful"
  .split(" ")
  .map(s => s.charAt(0).toUpperCase() + s.slice(1))
  .join(" ")