這些JavaScript程式設計黑科技，裝逼指南，高逼格程式碼，讓你驚歎不已

如何裝逼用程式碼罵別人SB

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

如何用程式碼優雅的證明自己NB

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

JavaScript 錯誤處理的方式的正確姿勢

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

從一行程式碼裡面學點JavaScript

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

翻譯成正常語言就是這樣的

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

論如何優雅的取隨機字串

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

匿名函式自執行

( 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() {}();

另外一種undefined

從來不需要宣告一個變數的值是undefined，因為JavaScript會自動把一個未賦值的變數置為undefined。所有如果你在程式碼裡這麼寫，會被鄙視的

var data = undefined;

但是如果你就是強迫症發作，一定要再宣告一個暫時沒有值的變數的時候賦上一個undefined。那你可以考慮這麼做：

var data = void 0; // undefined

論如何優雅的取整

var a = ~~2.33 //這種方法還可以將字串轉換成數字型別
var b= 2.33 | 0
var c= 2.33 >> 0

如何優雅的實現金錢格式化：1234567890 –> 1,234,567,890

用正則魔法實現：

var test1 = '1234567890'
var format = test1.replace(/\B(?=(\d{3})+(?!\d))/g, ',')

console.log(format) // 1,234,567,890

非正則的優雅實現：

 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

這個我服，還有這個你很機智

while (1) {
alert('牛逼你把我關了啊')
}

逗號運算子

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

論如何最佳的讓兩個整數交換數值

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

實現標準JSON的深拷貝

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

不考慮IE的情況下，標準JSON格式的物件蠻實用，不過對於undefined和function的會忽略掉。

不用Number、parseInt和parseFloat和方法把”1”字串轉換成數字

var a =1 ;
+a

如何裝逼的寫出”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。。。。所以這就是為什麼資料庫儲存對於貨幣的最小單位都是分。

簡單說，0.1和0.2的二進位制浮點表示都不是精確的，所以相加後不是0.3，接近（不等於）
0.30000000000000004。

所以，比較數字時，應該有個寬容值。ES6中這個寬容值被預定義了：Number.EPSILON。

最短的程式碼實現陣列去重

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

取出一個陣列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);

將argruments物件轉換成陣列

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

或者ES6：

var argArray = Array.from(arguments)