Given a JavaScript array of objects, how can I get the key and value of each object?

The code below shows what I'd like to do, but obviously doesn't work:

var top_brands = [ { 'Adidas' : 100 }, { 'Nike' : 50 }];
var brand_options = $("#top-brands");
$.each(top_brands, function() {
  brand_options.append($("<option />").val(this.key).text(this.key + " "  + this.value));
});

So, how can I get this.key and this.value for each entry in the array?

javascript jquery
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