如果您已经(或正在考虑)使用Lodash,解决方案很容易:

_.upperFirst('fred');
// => 'Fred'

_.upperFirst('FRED');
// => 'FRED'

_.capitalize('fred') //=> 'Fred'

查看他们的文档: https://lodash.com/docs#capitalize

_.camelCase(“Foo Bar”); //=>“FooBar”

https://lodash.com/docs/4.15.0#camelCase

_.lowerFirst('Fred');
// => 'fred'

_.lowerFirst('FRED');
// => 'fRED'

_.snakeCase('Foo Bar');
// => 'foo_bar'

Vanilla JavaScript for first up 案例:

function upperCaseFirst(str){
    return str.charAt(0).toUpperCase() + str.substring(1);
}

简单的ES6合成与模板链

const capitalize = (str) => { return `${str[0].toUpperCase()}${str.slice(1)}` // return str[0].toUpperCase() + str.slice(1) // without template string } console.log(capitalize(“这是一个测试”)); console.log(capitalize(“埃菲尔塔”)); console.log(capitalize(“/index.html”)); /* “这是一个测试” → “这是一个测试” “埃菲尔塔” → “埃菲尔塔” “/index.html” → “/inde”

你可以这样做,这样一行。

string[0].toUpperCase() + string.substring(1)

function cap(input) {
    return input.replace(/[\.\r\n\t\:\;\?\!]\W*(\w)/g, function(match, capture) {
         // For other sentences in the text
         return match.toUpperCase();
    }).replace(/^\W*\w/, function(match, capture) {
        // For the first sentence in the text
        return match.toUpperCase();
    });;
}

var a = "hi, dear user. it is a simple test. see you later!\r\nbye";
console.log(cap(a));
// Output: Hi, dear user. It is a simple test. See you later!
// Bye

在CSS中:

p::first-letter {
    text-transform:capitalize;
}

或者你可以使用Sugar.js资本()

例子:

'hello'.capitalize()           -> 'Hello'
'hello kitty'.capitalize()     -> 'Hello kitty'
'hello kitty'.capitalize(true) -> 'Hello Kitty'