Why a JavaScript array splice method, Web environment, node environment, JAVA8 environment, etc.

1, node environment.

Version:

examples are as follows:

2. Web Environment

var ss = [11,22];var TT = [55,66];ss.splice (0,0,TT); Console.log (ss.length); Console.log (ss); alert (ss);

Console output:

3
Array [array[2], 11, 22]

Page popup content: 55,66,11,22.

3. JAVA8 Environment

Why ...

In fact, the result of the above splice is the same, the array becomes a multidimensional array, the above results in the length of the array is the same, meaning that the result is correct, the difference is different output mode (some of the output multidimensional array of structure information, some of the format of the output, multi-dimensional array does not exist, Multidimensional underlying or one-dimensional array->c language experience).

Why is a JavaScript array splice method, Web environment, node environment, JAVA8 environment, and so on?