关于java:仅用六种字符来完成Hello-World你能做到吗

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Hello World 对于每一个开发者来说都不生疏,因为在咱们学习任何一个语言或框架的时候,都会有一个 Hello World 的案例来帮忙咱们疾速入门。

如果咱们应用 JavaScript 来输入 Hello World 的话,能够这样写:

alert("Hello World");

放入 HTML:

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

在浏览器中关上就能够如下状况输入 Hello World 了:

挑战:仅用六种字符来编写 JavaScripte

下面咱们在 JavaScript 中实现 Hello World 的时候,除去 HTML 相干的标签和属性,下面的实现语句 alert("Hello World"); 一共应用了 13 个字符,那么有没有方法用更少的字符来实现一样的性能呢?明天咱们就来挑战一下:有没有方法仅应用 6 个字符来编写 JavaScripte 程序,以实现 Hello World 的输入?



先思考一下,有思路没?没思路的话,上面有提醒 …







提醒:应用这六个字符:()+[]!







再思考一下,有思路没?没思路的话,上面有答案和解析 …







答案

<html>
<script type="text/javascript">
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</script>
</html>

什么?你不信这能够输入 Hello World?那么你能够将其复制下来,放到 HTML 文件中,再关上试试吧!

为什么?

为什么咱们能够仅应用这 6 个字符来编写这些奇奇怪怪的 JavaScript 代码?这齐全是因为 JavaScript 独特的类型零碎和转换机制。

下面的 6 个字符能够分为三类:

  • []:用于创立数组
  • !+:对数组执行一些操作
  • ():对操作进行分组

根底原理

  • []能够用来创立数组,而 ![] 则能够返回false
  • 预约义的规定:2 + true,会转化为2 + 1,最初失去3
  • 预约义的规定:2 + "2",会转化为2 + "2",最初失去"22"

提取字母 ![] 能够获取 false![] + [] 那能够获取 "false" 字符串,那么咱们就能够通过下标获取其中的字母,比方:(![] + [])[1]能够获取 false 字符串中第二位的字母a

提取数字 ![] 能够获取 false,因为+false 能够获取 0,所以+![] 就能够获取到 0;因为+true 能够获取 1,所以+!![] 就能够获取到1。这样依附运算就能够获取更多其余数字

好了,有了这些根底基础知识之后,对于这个神奇的答案晓得是怎么来的了吧?

本文首发:仅用六个字符来实现 Hello World,你能做到吗?,转载请注明该文章链接

参考资料

  • https://www.cnblogs.com/lzkwi…
  • http://www.jsfuck.com/

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