仅用六种字符来完成Hello World,你能做到吗?

Hello World 对于每一个开发者来说都不陌生,因为在我们学习任何一个语言或框架的时候,都会有一个Hello World的案例来帮助我们快速入门。

如果我们使用JavaScript来输出Hello World的话,可以这样写:

alert("Hello World");

放入HTML:

<html> <script type="text/javascript"> alert("Hello World"); </script> </html>

在浏览器中打开就可以如下情况输出Hello World了:

仅用六种字符来完成Hello World,你能做到吗?

挑战:仅用六种字符来编写JavaScripte

上面我们在JavaScript中实现Hello World的时候,除去HTML相关的标签和属性,上面的实现语句alert("Hello World");一共使用了13个字符,那么有没有办法用更少的字符来实现一样的功能呢?今天我们就来挑战一下:有没有办法仅使用6个字符来编写JavaScripte程序,以实现Hello World的输出?

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先思考一下,有思路没?没思路的话,下面有提示...

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提示:使用这六个字符:(,),+,[,],!

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再思考一下,有思路没?没思路的话,下面有答案和解析...

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答案

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</script> </html>

什么?你不信这可以输出Hello World?那么你可以将其复制下来,放到HTML文件中,再打开试试吧!

为什么?

为什么我们可以仅使用这6个字符来编写这些奇奇怪怪的JavaScript代码?这完全是由于JavaScript独特的类型系统和转换机制。

上面的6个字符可以分为三类:

[,]:用于创建数组

!,+:对数组执行一些操作

(,):对操作进行分组

基础原理

[]可以用来创建数组,而![]则可以返回false

预定义的规则:2 + true,会转化为2 + 1,最后得到3

预定义的规则:2 + "2",会转化为2 + "2",最后得到"22"

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