Javascript 如何推送到特定位置的数组？
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How to push to an array in a particular position?
提问by fancy
I'm trying to efficiently write a statement that pushes to position 1 of an array, and pushes whatever is in that position, or after it back a spot.
我正在尝试有效地编写一个语句，该语句将推入数组的位置 1，并将该位置中的任何内容推入，或将其推回一个位置。
array = [4,5,9,6,2,5]
#push 0 to position 1
array = [4,0,5,9,6,2,5]
#push 123 to position 1
array = [4,123,0,5,9,6,2,5]
What is the best way to write this? (javascript or coffeescript acceptable)
写这个的最好方法是什么？（可以接受javascript或coffeescript）
Thanks!
谢谢！
回答by fancy
array = [4,5,9,6,2,5]
#push 0 to position 1
array.splice(1,0,0)
array = [4,0,5,9,6,2,5]
#push 123 to position 1
array.splice(1,0,123)
array = [4,123,0,5,9,6,2,5]
回答by Vlada
To push any item at specific index in array use following syntax
要推送数组中特定索引处的任何项目，请使用以下语法
// The original array
var array = ["one", "two", "four"];
// splice(position, numberOfItemsToRemove, item)
array.splice(2, 0, "three");
console.log(array); // ["one", "two", "three", "four"]
回答by Vlada
The splice()function is the only native array function that lets you add elements to the specific place of an array
该splice()函数是唯一的原生数组函数，可让您将元素添加到数组的特定位置
I will get a one array that you entered in your question to describe
我会得到一个你在问题中输入的数组来描述
splice(position, numberOfItemsToRemove, item)
position= What is the position that you want to add new itemnumberOfItemsToRemove= This indicate how many number of items will deleted. That's mean delete will start according to the position that new item add.
position=您要添加新项目的位置是什么numberOfItemsToRemove= 这表示将删除多少个项目。这意味着删除将根据新项目添加的位置开始。
Ex= if you want to add 1 position to 123 result will be like this ([4,123,0,5,9,6,2,5]) but if you give
numberOfItemsToRemoveto 1 it will remove first element after the 123 if you give 2 then its delete two element after 123.
例如= 如果你想在 123 上添加 1 个位置，结果将是这样的 ([4,123,0,5,9,6,2,5]) 但如果你给
numberOfItemsToRemove1，它将删除 123 之后的第一个元素，如果你给2 然后它删除 123 之后的两个元素。
item= the new item that you add
item= 您添加的新项目
function my_func(){
var suits = [4,0,5,9,6,2,5]
suits.splice(1 , 0 , 123);
document.getElementById('demo').innerHTML = suits;
}<button id="btn01" onclick="my_func()">Check</button>
<p id="demo"></p>