js设置首字母大写

function capitalizeFirstLetter(str) {
    if (!str) return '';
    return str.charAt(0).toUpperCase() + str.slice(1);
}

// 示例使用
const originalString = "hello world";
const capitalizedString = capitalizeFirstLetter(originalString);
console.log(capitalizedString); // 输出: "Hello world"

function capitalizeEachWord(str) {
    return str.replace(/\b\w/g, char => char.toUpperCase());
}

// 示例使用
const originalString = "hello world from javascript";
const capitalizedString = capitalizeEachWord(originalString);
console.log(capitalizedString); // 输出: "Hello World From Javascript"