JavaScript 怎麼快速宣告乙個陣列，長度為 100，元素全是 0？

1樓：xgqfrms

// string array

const arrpadStart(100, ` `)].map((item, i) => i + 1100) ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "60", "61", "62", "63", "64", "65", "66", "67", "68", "69", "70", "71", "72", "73", "74", "75", "76", "77", "78", "79", "80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "90", "91", "92", "93", "94", "95", "96", "97", "98", "99", "100"]

// number array

const arrpadStart(100, ` `)].map((item, i) => i + 1);

// (100) [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100]

no for & 100 Array & Uint8Array & Typed Arrays[...

newUint8Array

(100

)]// (100) [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

[...``.

padStart

(100

,` `

)].map(i

=>0);

// (100) [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

2樓：

其實我搜尋的是如何生成固定長度的陣列，結果來到了這裡，順便也答一下：

const arr = (new Array(100)).fill(0);

3樓：吳俊

100個元素，題主說的那種方法就行了。

如果是大規模、稀疏陣列，初始化的代價不能忽略的時候，《程式設計珠璣》裡面給出了乙個巧妙的方案。

具體哪一章節不記得了，書很薄，翻翻就能找到。

4樓：

贊同安而遇的答案。

以如下方式宣告，你只需要有乙個靠譜的編輯器即可，或者乙個有靠譜編輯功能的IDE。按鍵數比豪情的要少。

new Array(101).join(0).split('');

這個語句輸入需要按鍵40次：

newrray101.join0.split'';

而按這種方式：

var a ＝ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];

vim，共22次按鍵：

ivara=;h100i0,x

Emacs，共24次按鍵：

vara=;0,100

5樓：尚春

為什麼會有這種需求？

如果是需要做多個累加器，可以 Array(100) 建立乙個含有 100 個 undefined 元素的陣列，然後累加時使用短路運算子賦初始值為 0 即可：

arr.forEach(function (item) );

否則，還是老老實實的遍歷賦值吧，這類技巧不用也罷。

6樓：安而遇

vara=

[0,0

,0,0

];原答案的解釋正如zecy的答案一樣，有個好編輯器，這種還是非常方便輸入的。同時用直接量是效能最好的。

不過我覺得還可以補充乙個，大多數人沒有想到的型別化陣列：

newInt8Array

(100

);它的元素預設初始化為0。

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