JavaScript authoritative Guide Notes (7th Chapter array)

1. Note:

true // This creates a property named " -1.23" // This 1001st element of the array // Array index 1. Same as a[1]

2. Delete operator produces sparse array

3, set the length of the array will automatically cut off or add undefined

4.javascript does not support a true multidimensional array but can be approximated by an array of arrays

5. Splice modifies the array of calls, and slice does not

6, using Unshift () is a one-time insertion instead of a single insertion

7.

JavaScript authoritative Guide Notes (7th Chapter array)