共计 9294 个字符,预计需要花费 24 分钟才能阅读完成。
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?
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先思考一下,有思路没?没思路的话,上面有提醒 …
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提醒:应用这六个字符:(
,)
,+
,[
,]
,!
…
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再思考一下,有思路没?没思路的话,上面有答案和解析 …
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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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