标签模板字符串

      // ES6: 标签模板字符串
      const name = "why";
      const age = 18;

      // 1.模板字符串的基本使用
      const str = `my name is ${name}, age is ${age}`;
      console.log(str); //my name is why, age is 18

      // 2.标签模板字符串的使用
      function foo(...args) {
        console.log(args);
      }

      foo("why", 18, 1.88); // ['why', 18, 1.88]

      foo`my name is ${name}, age is ${age}`;
      // [Array(3), 'why', 18]
      //0: (3) ['my name is ', ', age is ', '', raw: 0:Array(3)]
//1: "why"
//2: 18

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