为什么在JSON数据上使用$ .each后我的闭包变量被清除了？

Consider the following example:

请考虑以下示例:

var features = [];

$.getJSON(annotations_url, function(data) { 
  $.each(data, function(key, val) {
    features.push(wkt_parser.read(val.annotation.wkt_data));
    // at this point, "features" contains objects
  });
});

annotationLayer.addFeatures(features);
// here, it is empty again
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