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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.

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