How to use the splice () function of JavaScript

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Detailed explanation of splice () function

The splice () method adds / removes items to / from the array, and then returns the deleted items.

Note: this method changes the original array.

Parameters:

Index-required. An integer that specifies the location of the added / deleted items, using negative numbers to specify the location from the end of the array. Howmany-required. The number of items to delete. If set to 0, the item is not deleted. Item1,... , itemX-optional. A new item added to the array.

Return value

Array-contains a new array of deleted items, if any. Case 1 (only one parameter)

Splice (index)-- > start with the location of the index and delete all subsequent elements (including the index)

If index

< 0 , 则删除最后-index个元素 splice()函数返回删除元素数组 var array = [0,1,2,3,4,5,6] [xss_clean]("原数组为："+array + "") array.splice(2) [xss_clean]("array.splice(2)的结果为：",array)

Var array = [xss_clean] ("original array is" + array + ") var result = array.splice (- 3) [xss_clean] (" array.splice (- 3) result is: ", array +") [xss_clean] ("deleted content is:", result)

Case 2 (two parameters)

Splice (index,howmany)-- > the number of deletions starting from the index location. Howmany is the number of deletions.

If howmany is less than or equal to 0, it will not be deleted

Var array = [xss_clean] ("original array is" + array + ") var result = array.splice (2) [xss_clean] (" array.splice (2)) the result is: ", array +") [xss_clean] ("deleted content is:", result)

Var result = array.splice (2jin0) [xss_clean] ("the result of array.splice (2jin0) is:", array + ") [xss_clean] (" deleted content is: ", result)

Case 3 (greater than or equal to three parameters)

Splice (index, howmany, item1, … , itemX)

When index > 0

(1. Do not delete and only add when howmany is 0-- add item1 before the index location. , the number of itemX

(2. Howmany > 0 delete and add-add item1 before index location, … , the number of itemX, and delete the number starting from the index position, howmany is the number of deletions index 0 delete and add-- add item1 before the-index position. , the number of itemX, and delete the number starting from the-index position, howmany is the number of deletions

1.1

Var array = [xss_clean] ("original array is:" + array + ") var result = array.splice (" 2memo 8je 9) [xss_clean] ("array.splice") the result is: ", array +") [xss_clean] ("deleted content is:", result)

1.2

Var result = array.splice [xss_clean] ("the result of array.splice is:", array + ") [xss_clean] (" deleted content is: ", result)

2.1

Var array = [xss_clean] ("the original array is:" + array + ") var result = array.splice (- 2meme) [xss_clean] (" the result of array.splice ("array.splice (- 2Power8)) is:", array + ") [xss_clean] (" deleted content is: ", result)

2.2

Var array = [xss_clean] ("the original array is:" + array + ") var result = array.splice (- 2meme 3d8) [xss_clean] (" the result of array.splice ("array.splice (- 2d3)) is:", array + ") [xss_clean] (" deleted content is: ", result)

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