The vue array element (data) changes and does not follow the new (view) solution

Due to JavaScript limitations, Vue cannot detect the following changing arrays:

1. When you use the index to set an item directly, for example:vm.items[indexOfItem] = newValue
2. When you modify the length of the array, for example:vm.items.length = newLength

Solution: https://blog.csdn.net/qq_38761664/article/details/78037831