Javascript JS在特定索引处插入数组
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JS insert into array at specific index
提问by lilly
I would like to insert a string into an array at a specific index. How can I do that?
我想在特定索引处将字符串插入到数组中。我怎样才能做到这一点？
I tried to use push()
我尝试使用 push()
回答by nils
Well, thats pretty easy. Assuming you have an array with 5 objects inside and you want to insert a string at index 2 you can simply use javascripts array splice method:
嗯，这很容易。假设您有一个包含 5 个对象的数组，并且您想在索引 2 处插入一个字符串，您可以简单地使用 javascripts array splice 方法：
var array = ['foo', 'bar', 1, 2, 3],
insertAtIndex = 2,
stringToBeInserted = 'someString';
// insert string 'someString' into the array at index 2
array.splice( insertAtIndex, 0, stringToBeInserted );
Your result will be now:
你的结果现在是：
['foo', 'bar', 'someString', 1, 2, 3]
FYI: The push() method you used just adds new items to the end of an array (and returns the new length)
仅供参考：您使用的 push() 方法只是将新项目添加到数组的末尾（并返回新长度）
