$.getScript with caching

jquery.get_cached_script.js

jQuery.getCachedScript = function(url, callback, options) {
  // allow user to set any option except for dataType, cache, and url
  options = jQuery.extend(options || {}, {
    dataType: "script",
    cache: true,
    url: url,
    complete: callback || jQuery.noop
  });
  
  // Use jQuery.ajax() since it is more flexible than $.getScript
  // Return the jqXHR object so we can chain callbacks
  return jQuery.ajax(options);
};

The original getScript already support the options object. Use this signature
$.getScript({
url: "foo.js",
cache: true
})