问将google地图自动完成限制为仅限英国地址

EN

var input = document.getElementById('searchTextField');
var options = {
   types: ['(cities)'],
   componentRestrictions: {country: 'tr'}//Turkey only
};
var autocomplete = new google.maps.places.Autocomplete(input,options);

//The head element, where the Google Autocomplete code will insert a tag 
//for a javascript file.
var head = $('head')[0];  
//The name of the method the Autocomplete code uses to insert the tag.
var method = 'appendChild';  
//The method we will be overriding.
var originalMethod = head[method];

head[method] = function () {
  if (arguments[0] && arguments[0].src && arguments[0].src.match(/GetPredictions/)) {  //Check that the element is a javascript tag being inserted by Google.
    var callbackMatchObject = (/callback=([^&]+)&|$/).exec(arguments[0].src);  //Regex to extract the name of the callback method that the JSONP will call.
    var searchTermMatchObject = (/\?1s([^&]+)&/).exec(arguments[0].src);  //Regex to extract the search term that was entered by the user.
    var searchTerm = unescape(searchTermMatchObject[1]);
    if (callbackMatchObject && searchTermMatchObject) {
      var names = callbackMatchObject[1].split('.');  //The JSONP callback method is in the form "abc.def" and each time has a different random name.
      var originalCallback = names[0] && names[1] && window[names[0]] && window[names[0]][names[1]];  //Store the original callback method.
      if (originalCallback) {
        var newCallback = function () {  //Define your own JSONP callback
          if (arguments[0] && arguments[0][3]) {
            var data = arguments[0][4];  //Your autocomplete results
            //SUCCESS! - Limit results here and do something with them, such as displaying them in an autocomplete dropdown.
          }
        }

        //Add copy all the attributes of the old callback function to the new callback function. This prevents the autocomplete functionality from throwing an error.
        for (name in originalCallback) {  
          newCallback[name] = originalCallback[name];
        }
        window[names[0]][names[1]] = newCallback;  //Override the JSONP callback
      }
    }

  //Insert the element into the dom, regardless of whether it was being inserted by Google.
  return originalMethod.apply(this, arguments);
};