es6 字符串String的扩展(实例讲解)

新特性：模板字符串 传统字符串 let name = Jacky; let occupation = doctor; //传统字符串拼接 let str = He is + name +,he is a + occupation; es6简洁的字符串拼接 let name = Jacky; let occupation = doctor; //模板字符串拼接 let str = `He is ${name},he is a ${occupation}`; 对比两段拼接的代码，模板字符串使得我们不再需要反复使用双引号（或者单引号）了；而是改用反引号标识符（`），插入