Test next summary

The first part introduces the basic concept of array and some simple array element operation functions , actually , Arrays provide many more functions .

push、pop、shift and unshift Is a function that operates on both ends of an array , As mentioned above , This article will not be repeated .

Element delete （ Object mode ）
The previous article has briefly introduced , An array is a special object , So we can try to use the attribute deletion method of the object ：delete.

for instance ：111111

let arr = [1,2,3,4,5];
delete arr[2];
console.log(arr);
1
2
3
The code executes as follows ：

Pay attention to the position marked yellow in the drawing , Although the element has been deleted , But the length of the array is still 5, And the deleted location is empty . If our access subscript is 2 The elements of , We will get the following results ：
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