How to add an element at a specified location in an js array

Today Xiaobian to share with you how to add elements in the specified location of the js array of relevant knowledge points, detailed content, clear logic, I believe that most people still know too much about this knowledge, so share this article for your reference, I hope you have something to learn after reading this article, let's take a look at it.

Method 1: use the splice () method (middle of the array)

Using splice, you can simply add elements to the middle of an array, which is the most efficient way.

/ insert var fruits = ["Banana", "Orange", "Apple", "Mango"] at the specified location of the array; fruits.splice (2,0, "Lemon", "Kiwi"); / / output the result / / Banana, Orange, Lemon, Kiwi, Apple, Mango / / insert var shuiguo = ["Banana", "Orange", "Apple", "Mango"] at the beginning of the array; shuiguo.splice (0,0, "Lemon") / / output result / / Lemon, Banana, Orange, Apple, Mango

Method 2: use the push () method (the end of the array)

You can add one or more elements to the end of the array and return a new length.

The push () method and the pop () method use the advanced post-stack function provided by the array

Var arr=; arr.push; arr.push; / / push adds elements console.log (arr) to the end of the array; / / arr= [1, 2, 3, 4, 4, 6, 5, and 8]; var arr1= [1, 2, 3, 4, 4, 5, and 6]; arr1.pop (); / pop, out of the stack, deletes the last data of the array, console.log (arr1); / / arr= [1, 2, 3, 4, 5]

Method 3: use the unshift () method (the beginning of the array)

You can add one or more elements to the beginning of the array and return a new length

The first parameter of the method will be the new element 0 of the array, if there is a second parameter, it will become the new element 1, and so on.

Var arr= [2Jing 3Jing 4]; arr.unshift ("hello", 1, [6J8]); / / parameters can be numeric values, characters, array console.log (arr). That's all about the article "how to add elements to a specified location in the js array". Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.