Javascript:在字符串中插入变量

const str1 = "Hello, ";
const str2 = "world!";
const result = str1.concat(str2);
console.log(result); // 输出 "Hello, world!"

const str = "Hello, world!";
const replaceStr = "world";
const result = str.replace("world", replaceStr);
console.log(result); // 输出 "Hello, replaceStr!"

const name = "John";
const str = `My name is ${name}`;
console.log(str); // 输出 "My name is John"