使用javascript动态地将值推送到数组中

Question

I'm have trouble finding a way to push values into an array dynamically. I have given the following situation:

var get_anchors= new Array('pitzel','mitzel','sizzle') 

current_anchor= pics[key].anchor; //has the value 'sizzle'

get_anchors[current_anchor].push(new Array('sizzle2','sizzle3'))

Javascript fails and says get_anchors[current_anchor] is undefined

How can I make get_anchors[current_anchor] work. Or is there a different way to get this done?

The desired result should look like 'pitzel','mitzel','sizzle'['sizzle2','sizzle3]

Answer 1

Based on your comment it looks like you want a hash map instead of an array. You can use an object for this:

var anchors = {
    'pitzel': [],
    'mitzel': [],
    'sizzle': []
};

Then you can do:

anchors[current_anchor].push('sizzle2', 'sizzle3');

or assuming that anchors does not have a property with the value of current_anchor , simply assign a new array:

anchors[current_anchor] = ['fooX', 'fooY'];

Of course you can populate the object dynamically as well. Have a look at Working with Objects for more information.

Answer 2

I'm not sure I understand what you're trying to do, but I think you're trying to insert a few elements after where another occurs. This will do the trick:

var get_anchors = [ 'pitzel', 'mitzel', 'sizzle' ];

current_anchor = get_anchors.indexOf(pics[key].anchor);
get_anchors.splice(current_anchor + 1, 0, 'sizzle2', 'sizzle3');

// get_anchors = [ 'pitzel', 'mitzel', 'sizzle', 'sizzle2', 'sizzle3' ]