这些JavaScript编程黑科技，装逼指南，高逼格代码，让你惊叹不已

如何装逼用代码骂别人SB

(!(~+[])+{})[--[~+""][+[]]*[~+[]] + ~~!+[]]+({}+[])[[~!+[]]*~+[]]

如何用代码优雅的证明自己NB

([][[]]+[])[+!![]]+([]+{})[!+[]+!![]]

JavaScript 错误处理的方式的正确姿势

try {    something} catch (e) {    window.location.href =        "http://stackoverflow.com/search?q=[js]+" + e.message;}

从一行代码里面学点JavaScript

[].forEach.call($$("*"),function(a){    a.style.outline="1px solid #"+(~~(Math.random()*(1<<24))).toString(16)})

翻译成正常语言就是这样的

Array.prototype.forEach.call(document.querySelectorAll('*'), dom => dom.style.outline = `1px solid #${parseInt(Math.random() * Math.pow(2,24)).toString(16)}`)

论如何优雅的取随机字符串

Math.random().toString(16).substring(2) // 13位Math.random().toString(36).substring(2) // 11位

匿名函数自执行

( function() {}() );( function() {} )();[ function() {}() ];~ function() {}();! function() {}();+ function() {}();- function() {}();delete function() {}();typeof function() {}();void function() {}();new function() {}();new function() {};var f = function() {}();1, function() {}();1 ^ function() {}();1 > function() {}();

另外一种undefined

从来不需要声明一个变量的值是undefined，因为JavaScript会自动把一个未赋值的变量置为undefined。所有如果你在代码里这么写，会被鄙视的

var data = undefined;

但是如果你就是强迫症发作，一定要再声明一个暂时没有值的变量的时候赋上一个undefined。那你可以考虑这么做：

var data = void 0; // undefined

论如何优雅的取整

var a = ~~2.33 //这种方法还可以将字符串转换成数字类型var b= 2.33 | 0var c= 2.33 >> 0

如何优雅的实现金钱格式化：1234567890 –> 1,234,567,890

用正则魔法实现：

var test1 = '1234567890'var format = test1.replace(/\B(?=(\d{3})+(?!\d))/g, ',')console.log(format) // 1,234,567,890

非正则的优雅实现：

 function formatCash(str) {       return str.split('').reverse().reduce((prev, next, index) => {            return ((index % 3) ? next : (next + ',')) + prev       })}console.log(formatCash('1234567890')) // 1,234,567,890

这个我服，还有这个你很机智

while (1) {alert('牛逼你把我关了啊')}

逗号运算符

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

论如何最佳的让两个整数交换数值

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

实现标准JSON的深拷贝

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

不考虑IE的情况下，标准JSON格式的对象蛮实用，不过对于undefined和function的会忽略掉。

不用Number、parseInt和parseFloat和方法把”1”字符串转换成数字

var a =1 ;+a

如何装逼的写出”hello world!”

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parseInt(0.0000008) === 8

++[[]][+[]]+[+[]] == 10

0.1 + 0.2 == 0.3

0.1 +0.2 == 0.3 竟然是不成立的。。。。所以这就是为什么数据库存储对于货币的最小单位都是分。

简单说，0.1和0.2的二进制浮点表示都不是精确的，所以相加后不是0.3，接近（不等于）
0.30000000000000004。

所以，比较数字时，应该有个宽容值。ES6中这个宽容值被预定义了：Number.EPSILON。

最短的代码实现数组去重

[...new Set([1, "1", 2, 1, 1, 3])]

取出一个数组中的最大值和最小值

var numbers = [5, 458 , 120 , -215 , 228 , 400 , 122205, -85411]; var maxInNumbers = Math.max.apply(Math, numbers); var minInNumbers = Math.min.apply(Math, numbers);

将argruments对象转换成数组

var argArray = Array.prototype.slice.call(arguments);

或者ES6：

var argArray = Array.from(arguments)