JS deletes an element method in an array. js deletes an array element.

JS deletes an element method in an array. js deletes an array element.

Deletes an element specified by an array.

First, you can define a function for the JS array object to find the location of the specified Element in the array, that is, the index. The code is:

Array.prototype.indexOf = function(val) { for (var i = 0; i < this.length; i++) { if (this[i] == val) return i; } return -1; }; 

Then, use the built-in functions of the js array to delete this element by obtaining the index of this element:

Code:

Array.prototype.remove = function(val) { var index = this.indexOf(val); if (index > -1) { this.splice(index, 1); } }; 

This constructs such a function. For example, I have an array:

var emp = ['abs','dsf','sdf','fd'] 

If we want to delete the 'fd ', we can use:

emp.remove('fd'); 

An item of the deleted Array

Splice (index, len, [item]) Note: This method changes the original array.

Splice has three parameters. It can also be used to replace, delete, or add one or more values in the array.

Index: array starts subscript len: length of replacement/deletion item: Value of replacement, item is null if the delete operation

For example, arr = ['A', 'B', 'C', 'D']

Delete

// Delete a value whose start subscript is 1 and its length is 1 (len sets 1. If it is 0, the array remains unchanged) var arr = ['A', 'B ', 'C', 'D']; arr. splice (1, 1); console. log (arr); // ['A', 'C', 'D']; // delete a value whose start subscript is 1 and its length is 2 (len is set to 2) var arr2 = ['A', 'B', 'C', 'D'] arr2.splice (1, 2); console. log (arr2); // ['A', 'D']

Replace

// Replace the START subscript with 1 and the value of 1 with 'ttt'. len sets 1 var arr = ['A', 'B', 'C ', 'D']; arr. splice (, 'ttt'); console. log (arr); // ['A', 'ttt', 'C', 'D'] var arr2 = ['A', 'B', 'C ', 'D']; arr2.splice (1, 2, 'ttt'); console. log (arr2); // ['A', 'ttt', 'D'] Replace the start subscript with 1, and the two values with a length of 2 with 'ttt ', len sets 1

Add ---- len is set to 0, and item is the added value.

Var arr = ['A', 'B', 'C', 'D']; arr. splice (, 'ttt'); console. log (arr); // ['A', 'ttt', 'B', 'C ', 'D'] indicates to add a 'ttt' <span style = "font-size: 14px; font-family: Arial, Helvetica, sans-serif; background-color: rgb (255,255,255); "> </span>

After deleting the elements in the array, the delete method sets the marked value to undefined, and the length of the array does not change.

Var arr = ['A', 'B', 'C', 'D']; delete arr [1]; arr; // ["a", undefined × 1, "c", "d"] two commas appear in the middle, the array length remains unchanged, and one item is undefined

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