體驗js中splice()的強大(插入、刪除或替換數組的元素)

處理數組的方法不少，javascript splice()算是最強大的了，它能夠用於插入、刪除或替換數組的元素。

Syntax

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

1.刪除-用於刪除元素，兩個參數，第一個參數（要刪除第一項的位置），第二個參數（要刪除的項數）

Remove 1 element from index 3
var myFish = ["angel", "clown", "drum", "mandarin", "surgeon"];
var removed = myFish.splice(3, 1);

// removed is ["mandarin"]
// myFish is ["angel", "clown", "drum", "surgeon"]

2.插入-向數組指定位置插入任意項元素。三個參數，第一個參數（其實位置），第二個參數（0），第三個參數（插入的項）

Remove 0 elements from index 2, and insert "drum"
var myFish = ["angel", "clown", "mandarin", "surgeon"];
var removed = myFish.splice(2, 0, "drum");

// myFish is ["angel", "clown", "drum", "mandarin", "surgeon"] 
// removed is [], no elements removed

3.替換-向數組指定位置插入任意項元素，同時刪除任意數量的項，三個參數。第一個參數（起始位置），第二個參數（刪除的項數），第三個參數（插入任意數量的項）

Remove 1 element from index 2, and insert "trumpet"
var myFish = ["angel", "clown", "drum", "surgeon"];
var removed = myFish.splice(2, 1, 'trumpet');

// myFish is ["angel", "clown", "trumpet", "surgeon"]
// removed is ["drum"]