What are the ways to add elements to the end of an array in JavaScript?

Add method: 1. Use push() method, syntax "array.push(element 1, element 2,..., element X)"; 2. Use splice() method, syntax "array. splice(arr.length,0,element 1,...,element X)".

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

How to add elements to the end of an array in JavaScript

1, push() method can be Appends one or more elements to the end of the array and returns the new length.

　1), syntax:

arrayObject.push(newelement1,newelement2,....,newelementX)

Parameters	Description
newelement1	Required. The first element to be added to the array.
newelement2	Optional. The second element to be added to the array.
newelementX	Optional. Multiple elements can be added.

2) Return value:

The new length after adding the specified value to the array .

3) Description:

The push() method can add its parameters to the end of arrayObject in sequence. It directly modifies arrayObject instead of creating a new array.

　4), Example:

var arr = new Array(3)
arr[0] = "ZhangQian"
arr[1] = "LinFang"
arr[2] = "HaiKun"

console.log(arr);// ["ZhangQian","LinFang","HaiKun"]
console.log(arr.push("C"));// 4
console.log(arr);// ["ZhangQian","LinFang","HaiKun","C"]
console.log(arr.push("A","B"));// 6
console.log(arr);// ["ZhangQian","LinFang","HaiKun","A","B","C"]

2, The splice() method adds/removes items to/from an array and returns the removed item.

　1), syntax:

arrayObject.splice(index,howmany,item1,.....,itemX)

Parameters	Description
index	Required. An integer specifying the position at which to add/remove an item. Use a negative number to specify the position from the end of the array.
howmany	Required. The number of items to delete. If set to 0, items will not be deleted.
item1, ..., itemX	Optional. New items added to the array.

2) Return value:

Type	Description
Array	The new array containing the deleted items, if any.

3) Description:

The splice() method can be deleted from the index The starting zero or more elements and replaces those removed elements with one or more values ​​declared in the argument list.

If an element is deleted from arrayObject, an array containing the deleted element is returned.

　The splice() method will directly modify the array.

　4), Example:

var arr = ["A","ZhangQian","LinFang","HaiKun"];

arr.splice(1,0,"B","C");
console.log(arr);
arr.splice(arr.length,0,"D","C");
console.log(arr);

## Want Use the splice() method to add elements to the end of the array, and the index value needs to be set to the array length value.

[Recommended learning:

javascript advanced tutorial]

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