这些JavaScript编程黑科技，高逼格代码，让你惊叹不已

这些JavaScript编程黑科技，装逼指南，高逼格代码，让你赞叹不已

9、别的一种undefined

大年夜来不须要声明一个变量的值是undefined，因为JavaScript会主动把一个未赋值的变量置为undefined。所有如不雅你在代率攀里这么写，会被小看的

var data = http://news.51cto.com/art/201711/undefined;

然则如不雅你就是强迫症发生发火，必定要再声明一个临时没有值的变量的时刻赋上一个undefined。那你可以推敲这么做：

这个牛逼了

var data = http://news.51cto.com/art/201711/void 0; // undefined

void在JavaScript中是一个操作符，对传入的操作不履行并且返回undefined。void后面可以跟()来竽暌姑，例如void(0)，看起来是不是很熟悉？没错，在HTML里阻拦带href的默认点击操作时，都爱好把href写成javascript:void(0)，实际上也是依附void操作不履行的意思。

当然，除了出于装逼的原因外，实际用处上不太赞成应用void，因为void的出现是为了兼容夙兴ECMAScript标准中没有undefined属性。void 0的写法让代码晦涩难解。

这些JavaScript编程黑科技，装逼指南，高逼格代码，让你赞叹不已

8、匿名函数自履行

10、论若何优雅的取整

var a = ~~2.33var b= 2.33 | 0var c= 2.33 >> 0

这些JavaScript编程黑科技，装逼指南，高逼格代码，让你赞叹不已

11、若何优雅的实现金钱格局化：1234567890 --> 1,234,567,890

25、掏出一个数组中的最大年夜值和最小值

用正则魔法实现：

这些JavaScript编程黑科技，装逼指南，高逼格代码，让你赞叹不已

非正则的优雅实现：

这些JavaScript编程黑科技，装逼指南，高逼格代码，让你赞叹不已

12、这个我服，还有这个你很机灵

我服

21、最短的代码实现数组去重

while (1) { alert('牛逼你把我关了啊')}

这个够短了吧，似乎是当初哪里看到的一个面试题，就本身想到了ES6的一些API

你很机灵，好一个障眼法

这些JavaScript编程黑科技，装逼指南，高逼格代码，让你赞叹不已

清除缓存： <a href="javascript:alert('清除成功');">清除缓存</a>

这些JavaScript编程黑科技，装逼指南，高逼格代码，让你赞叹不已

13、逗号运算符

var a = 0;var b = ( a++, 99 );console.log(a); // 1console.log(b); // 99

这些JavaScript编程黑科技，装逼指南，高逼格代码，让你赞叹不已

14、论若何最佳的让两个整数交换数值

惯例办法：

var a=1,b=2;a += b;b = a - b;a -= b;

缺点也很明显，整型数据溢出，对于32位字符最大年夜表示数字是2147483647，如不雅是2147483645和2147483646交换就掉败了。

黑科技办法：

a ^= b;b ^= a;a ^= b;

哈哈，看不懂的童鞋建议去补习一下C说话的位操作，我就不去复习了，以前学嵌入式时刻学的位操作都忘了

这些JavaScript编程黑科技，装逼指南，高逼格代码，让你赞叹不已

var a = {a: 1,b: { c: 1, d: 2 }}var b=JSON.parse(JSON.stringify(a))

这些JavaScript编程黑科技，装逼指南，高逼格代码，让你赞叹不已

不推敲IE的情况下，标准JSON格局的对象蛮实用，不过对于undefined和function的会忽视掉落。

哈哈，不准用强迫类型转换，那么就想到了强大年夜了隐式转换

var a =1 +a

这些JavaScript编程黑科技，装逼指南，高逼格代码，让你赞叹不已

17、若何装逼的写出"hello world!"

滚动条很长哦

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