startsWith()检查不同的字母或字符串

const word = "hello";
console.log(word.startsWith("h")); // true
console.log(word.startsWith("e")); // false

const url = "https://www.example.com";
console.log(url.startsWith("https")); // true
console.log(url.startsWith("http")); // false

const fileName = "example.txt";
console.log(fileName.startsWith(".txt")); // true
console.log(fileName.startsWith(".jpg")); // false