如何使用Javascript中数组对象的元素

Question

I have an arrayList with objects. And those objects have random numbers. I want to use some of them after, but I don't know how I can get to it. here's my code :

     for(var l=0; l<20; l++){
        o.x=Math.random();
        o.y=Math.random();
        tab3[l]=[o.x,o.y];

      }

So I want to use for example ox from the first object in the array (tab[0]). How is that possible? and if I wish to add some more elements, like oz to tab[0], how can I do that ?

Answer 1

why do you need to put ox and oy in an array? the way you currently have it you could also call tab[0][0].x and tab[0][1].y but that doesn't make any sense to do it that way.

you could do it like this

for(var l=0; l<20; l++){
    tab3[l]=[Math.random(),Math.random()];
  }

and you would call it like tab3[0][0] or tab3[0][1]

or since i don't know what your variable o is you could also do

for(var l=0; l<20; l++){
    o.x=Math.random();
    o.y=Math.random();
    tab3[l]=[o];
  }

then you would call tab[0].x or tab[0].y

when you want to add z you would add

tab[0].z = Math.random();