Javascript包含子数组的数组键

Question

I have an array which holds sub-arrays, the main array has custom keys; used as an identifier. The problem is I can't access the array with these keys set eg:

array.length - returns 0 when clearly it has values

In console:

[evt1: Array[0], evt2: Array[0]]
evt1: Array[0]
evt2: Array[0]

When changed back to a standard index (0,1,2), the array can be accessed - and performs as normal. Why is this happening?

Thanks

Answer 1

As stated in comments, you are not using an array, you are using an object. Use Object.keys(your_object).length to get length, and to travel through indexes:

for(var index in your_object){
    console.log(index,your_object[index]);
} 

You can also do:

var indexes=Object.keys(your_object);
for(var i=0;i<indexes.length;i++){
    console.log(indexes[i], your_object[indexes[i]]);
}

Answer 2

Arrays (like many other things in javascript) can have properties just like objects, however, array properties do not count toward the length of the array. What you should use is an object as the outer structure that contains your keys->arrays.

{evt1: Array[0], evt2: Array[0]}