技術標籤：JS

const name = 'John';
const age = 30;

console.log('My name is ' + name + ' and I am ' + age);
console.log(`My name is ${name} and I am ${age}`);
console.log(name.length);
console.log(name.toLowerCase());
console.log(name.toUpperCase());
console.log(name.substring(0, 2));
console.log(name.split
 
(''));

›My name is John and I am 30
›My name is John and I am 30
›4
›john
›JOHN
›Jo
›["J", "o", "h", "n"]