模板字面量

反引号 backticks

${} 占位符 placeholder

// Template literal with multi-line and string interpolation
const greeting = `Hello, my name is ${person.name}!
I am ${person.age} years old.`;//支持多行字符，输出时也是多行哦，保存了\\n

`hahahaha`+
`hehehehe`;//这样连接，输出时就是一行啦