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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正文完