编写一个 js 函数，返回一个字符串：今天是星期几 ...

Question

编写一个 js 函数，返回一个字符串：今天是星期几

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如果是星期一，就返回：今天是星期一

如果是星期二，就返回：今天是星期二

如果是星期三，就返回：今天是星期三

依次类推

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注意：除了逻辑和循环判断之外，有没有一行代码可以输出的

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