28 个 JavaScript 编程黑科技：还有这种操作！

柔光的暖阳◎ 2022-12-20 11:21 125阅读 0赞

> Javascript 是一门很厉害的语言，我可能学了假的 JavaScript，哈哈，大家还有什么推荐的，欢迎补充。

#### 1、单行写一个评级组件 ####

"★★★★★☆☆☆☆☆".slice(5 - rate, 10 - rate);

定义一个变量rate是1到5的值，然后执行上面代码，看图

![format_png][]

才发现插件什么的都弱爆了

![format_png 1][]

#### 2、如何装逼用代码骂别人SB ####

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

![format_png 2][]![format_png 3][]

#### 3、如何用代码优雅的证明自己NB ####

这个牛逼了

console.log(([][[]]+[])[+!![]]+([]+{})[!+[]+!![]])

![format_png 4][]

![format_png 5][]

#### 4、JavaScript 错误处理的方式的正确姿势 ####

????????????，舅服你

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

![format_png 6][]

![format_png 7][]

#### 5、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)}`)

接下来在浏览器控制看看：something magic happens

![format_png 8][]![format_png 9][]

#### 6、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

![format_png 10][]

#### 7、(10)"toString" === "10" ####

![format_png 11][]

#### 8、匿名函数自执行 ####

这么多写法你选择哪一种？我选择死亡。

( 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() {}();
    // ...

![format_png 12][]

#### 9、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

void在JavaScript中是一个操作符，对传入的操作不执行并且返回undefined。void后面可以跟()来用，例如void(0)，看起来是不是很熟悉？没错，在HTML里阻止带href的默认点击操作时，都喜欢把href写成javascript:void(0)，实际上也是依靠void操作不执行的意思。

当然，除了出于装逼的原因外，实际用途上不太赞成使用void，因为void的出现是为了兼容早起ECMAScript标准中没有undefined属性。void 0的写法让代码晦涩难懂。![format_png 13][]

#### 10、论如何优雅的取整 ####

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

![format_png 14][]

#### 11、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

![format_png 15][]

#### 12、这个我服，还有这个你很机智 ####

我服

while (1) {
        alert('牛逼你把我关了啊')
    }

你很机智，好一个障眼法

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

![format_png 16][]

#### 13、逗号运算符 ####

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

![format_png 17][]

#### 14、论如何最佳的让两个整数交换数值 ####

常规办法：

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位字符最大表示数字是2147483647，如果是2147483645和2147483646交换就失败了。黑科技办法：

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

![format_png 18][]

哈哈????，看不懂的童鞋建议去补习一下C语言的位操作，我就不去复习了，以前学嵌入式时候学的位操作都忘了

#### 15、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))

![format_png 19][]

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。

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

哈哈，不准用强制类型转换，那么就想到了强大了隐式转换

var a =1 
    +a

![format_png 20][]

#### 17、如何装逼的写出"hello world!" ####

滚动条很长哦????

([]+[][(![]+[])[!+[]+!![]+!![]]+([]+{})[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][([]+{})[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(+{}+[])[+!![]]+(!![]+[])[+[]]+([][[]]+[])[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]])())[+[]]+([][[]]+[])[!+[]+!![]+!![]]+(![]+[])[!+[]+!![]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+[][(![]+[])[!+[]+!![]+!![]]+([]+{})[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][([]+{})[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+([][[]]+[])[+[]]+([][[]]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(![]+[])[!+[]+!![]+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(+{}+[])[+!![]]+([]+[][(![]+[])[!+[]+!![]+!![]]+([]+{})[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][([]+{})[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(+{}+[])[+!![]]+(!![]+[])[+[]]+([][[]]+[])[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]])())[!+[]+!![]+!![]]+([][[]]+[])[!+[]+!![]+!![]])()([][(![]+[])[!+[]+!![]+!![]]+([]+{})[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][([]+{})[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(![]+[])[!+[]+!![]+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(+{}+[])[+!![]]+([]+[][(![]+[])[!+[]+!![]+!![]]+([]+{})[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][([]+{})[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(+{}+[])[+!![]]+(!![]+[])[+[]]+([][[]]+[])[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]])())[!+[]+!![]+!![]]+([][[]]+[])[!+[]+!![]+!![]])()(([]+{})[+[]])[+[]]+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+[])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+[]))+([]+{})[+!![]]+(!![]+[])[+!![]]+(![]+[])[!+[]+!![]]+([][[]]+[])[!+[]+!![]]+[][(![]+[])[!+[]+!![]+!![]]+([]+{})[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][([]+{})[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+([][[]]+[])[+[]]+([][[]]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(![]+[])[!+[]+!![]+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(+{}+[])[+!![]]+([]+[][(![]+[])[!+[]+!![]+!![]]+([]+{})[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][([]+{})[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(+{}+[])[+!![]]+(!![]+[])[+[]]+([][[]]+[])[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]])())[!+[]+!![]+!![]]+([][[]]+[])[!+[]+!![]+!![]])()([][(![]+[])[!+[]+!![]+!![]]+([]+{})[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][([]+{})[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+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居然能运行，牛逼的隐式转换![format_png 21][]![format_png 22][]

#### 18、parseInt(0.0000008) === 8 ####

![format_png 23][]

![format_png 24][]

#### 19、++\[\[\]\]\[+\[\]\]+\[+\[\]\] == 10 ####

![format_png 25][]

强大的隐式转换，23333

![format_png 26][]

#### 20、0.1 + 0.2 == 0.3 ####

![format_png 27][]

`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`。

![format_png 28][]

#### 21、最短的代码实现数组去重 ####

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

前不久面试阿里就问了这道题，哈哈，所以也写上一下

![format_png 29][]

#### 22、用最短的代码实现一个长度为m(6)且值都n(8)的数组 ####

Array(6).fill(8)

这个够短了吧，好像是当初哪里看到的一个面试题，就自己想到了ES6的一些API

![format_png 30][]

#### 23、短路表达式 ####

条件判断

var a = b && 1
        // 相当于
    if (b) {
        a = 1
    } else {
        a = b
    }
    var a = b || 1
        // 相当于
    if (b) {
        a = b
    } else {
        a = 1
    }

#### 24、JavaScript版迷宫 ####

![format_png 31][]逃出迷宫，2333![format_png 32][]

#### 25、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);

![format_png 33][]

#### 26、将argruments对象转换成数组 ####

var argArray = Array.prototype.slice.call(arguments);
    或者ES6：
    var argArray = Array.from(arguments)

#### 27、javascript高逼格之Function构造函数 ####

很多JavaScript教程都告诉我们，不要直接用内置对象的构造函数来创建基本变量，例如var arr = new Array(2); 的写法就应该用var arr = \[1, 2\];的写法来取代。

但是，Function构造函数（注意是大写的Function）有点特别。Function构造函数接受的参数中，第一个是要传入的参数名，第二个是函数内的代码（用字符串来表示）。

var f = new Function('a', 'alert(a)');
    f('jawil'); // 将会弹出窗口显示jawil

这种方式可以根据传入字符串内容来创建一个函数 是不是高大上？！![format_png 34][]

#### 28、从一个数组中找到一个数，O(n)的算法，找不到就返回 null。 ####

正常的版本:

function find (x, y) {
      for ( let i = 0; i < x.length; i++ ) {
        if ( x[i] == y ) return i;
      }
      return null;
    }
    let arr = [0,1,2,3,4,5]
    console.log(find(arr, 2))
    console.log(find(arr, 8))

结果到了函数式成了下面这个样子（好像上面的那些代码在下面若影若现，不过又有点不太一样，为了消掉if语言，让其看上去更像一个表达式，动用了 ? 号表达式）：

//函数式的版本
    const find = ( f => f(f) ) ( f =>
      (next => (x, y, i = 0) =>
        ( i >= x.length) ?  null :
          ( x[i] == y ) ? i :
            next(x, y, i+1))((...args) =>
              (f(f))(...args)))
    let arr = [0,1,2,3,4,5]
    console.log(find(arr, 2))
    console.log(find(arr, 8))

**最后奉劝大家一句：莫装逼、白了少年头，2333。。。**

源自：https://segmentfault.com/a/1190000010752361

声明：文章著作权归作者所有，如有侵权，请联系小编删除。

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