可选_可选_静态_Gets or sets the length of the array. This is a number one higher than the highest element defined in an array.
请不要重写destroy,请使用destroyImp来重写!
Removes the last element from an array and returns it.
Appends new elements to an array, and returns the new length of the array.
New elements of the Array.
Removes elements from an array and, if necessary, inserts new elements in their place, returning the deleted elements.
The zero-based location in the array from which to start removing elements.
可选deleteCount: numberThe number of elements to remove.
Removes elements from an array and, if necessary, inserts new elements in their place, returning the deleted elements.
The zero-based location in the array from which to start removing elements.
The number of elements to remove.
Elements to insert into the array in place of the deleted elements.
自研可观察数组,只监测数组本身,不检测数组下面对象的属性变化