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Showing content from https://developer.mozilla.org/zh-TW/docs/Web/JavaScript/Reference/Global_Objects/Array/splice below:

Array.prototype.splice() - JavaScript | MDN

Baseline Widely available

splice() 方法可以藉由刪除既有元素並／或加入新元素來改變一個陣列的內容。

const months = ["Jan", "March", "April", "June"];
months.splice(1, 0, "Feb");
// Inserts at index 1
console.log(months);
// Expected output: Array ["Jan", "Feb", "March", "April", "June"]

months.splice(4, 1, "May");
// Replaces 1 element at index 4
console.log(months);
// Expected output: Array ["Jan", "Feb", "March", "April", "May"]

array.splice(start[, deleteCount[, item1[, item2[, ...]]]])

start

陣列中要開始改動的元素索引（起始為 0）。若索引大於陣列長度，則實際開始的索引值會被設為陣列長度。若索引為負，則會從陣列中最後一個元素開始往前改動（起始為 -1）且若其絕對值大於陣列的長度，則會被設為 0。

deleteCount 選擇性

一個表示欲刪除的原陣列元素數量的整數。若省略了 deleteCount，或假如其值大於 array.length - start（也就是 deleteCount 大於 start 算起的剩餘元素數量），則所有從 start 開始到陣列中最後一個元素都會被刪除。若 deleteCount 為 0 或是負數，則不會有元素被刪除。 因此，你應該給定至少一個欲加入的新元素（見下方說明）。

item1, item2, ... 選擇性

從 start 開始，要加入到陣列的元素。 如果你沒有指定任何元素，則 splice() 只會依照 start 和 deleteCount 刪除陣列的元素。

一個包含被刪除的元素陣列。如果只有一個元素被刪除，依舊是回傳包含一個元素的陣列。 倘若沒有元素被刪除，則會回傳空陣列。

如果你插入的元素數量和刪除的數量不同，則回傳的陣列長度也會和原先的不同。

var myFish = ["angel", "clown", "mandarin", "sturgeon"];
var removed = myFish.splice(2, 0, "drum");

// myFish 為 ["angel", "clown", "drum", "mandarin", "sturgeon"]
// removed 為 [], 沒有元素被刪除

var myFish = ["angel", "clown", "drum", "mandarin", "sturgeon"];
var removed = myFish.splice(3, 1);

// removed 為 ["mandarin"]
// myFish 為 ["angel", "clown", "drum", "sturgeon"]

var myFish = ["angel", "clown", "drum", "sturgeon"];
var removed = myFish.splice(2, 1, "trumpet");

// myFish 為 ["angel", "clown", "trumpet", "sturgeon"]
// removed 為 ["drum"]

var myFish = ["angel", "clown", "trumpet", "sturgeon"];
var removed = myFish.splice(0, 2, "parrot", "anemone", "blue");

// myFish 為 ["parrot", "anemone", "blue", "trumpet", "sturgeon"]
// removed 為 ["angel", "clown"]

var myFish = ["parrot", "anemone", "blue", "trumpet", "sturgeon"];
var removed = myFish.splice(myFish.length - 3, 2);

// myFish 為 ["parrot", "anemone", "sturgeon"]
// removed 為 ["blue", "trumpet"]

var myFish = ["angel", "clown", "mandarin", "sturgeon"];
var removed = myFish.splice(-2, 1);

// myFish 為 ["angel", "clown", "sturgeon"]
// removed 為 ["mandarin"]

var myFish = ["angel", "clown", "mandarin", "sturgeon"];
var removed = myFish.splice(2);

// myFish 為 ["angel", "clown"]
// removed 為 ["mandarin", "sturgeon"]

• push() / pop() — add/remove elements from the end of the array
• unshift() / shift() — add/remove elements from the beginning of the array
• concat() — returns a new array comprised of this array joined with other array(s) and/or value(s)

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