javascript 对象中的字符串连接

const str1 = "Hello";
const str2 = "World";
const result = str1 + " " + str2;
console.log(result); // 输出 "Hello World"

const str1 = "Hello";
const str2 = "World";
const result = `${str1} ${str2}`;
console.log(result); // 输出 "Hello World"

const str1 = "Hello";
const str2 = "World";
const result = [str1, str2].join(" ");
console.log(result); // 输出 "Hello World"