Javascript：如何访问数组对象？

Question

i'm trying to access to an array object, but i just receive a "undefined" message on my console, i tried several ways of this forum, but no one helped me, please show me how to access it

Answer 1

It is no clear which array you want to access. In javascript it is simple to access array with Index like nameOfarray[Index].property_name .

var user=[
  {'name':'abc',id:1,'subject':[{'math':90,'english':80}]},
  {'name':'abc1',id:2,'subject':[{'math':90,'english':80}]},
  {'name':'abc2',id:3,'subject':[{'math':90,'english':80}]}
];

val name=user[0].name; var math_mark=user[0].subject[0].math;

Answer 2

What you have here is basically an array of objects.

Let's say arrayobj represents your variable that contains this whole thing that you've done a console.log of, so to access, say, picturepath of the first object (which has index 0 in the array), you can write -

arrayobj[0].picturepath

Similarly, by changing the index (of the array), you can get to the next object and to access object elements, you have to use .elementindex

So in general -

array[arrayindex].objectindex should give you the required results.

Answer 3

If you want to do operations on an object that is printed to the chrome console, right click on the object and do Store as global variable . Then you can access it using the name temp1 or whatever is printed out in the console.

Answer 4

You can access array values by entering index of theme.

for example array[0].administrators_id return 3

if you love firefox , you can use firefox. in Firefox console by click on array you can see it's content on right side.