是否有可能在iPhone的设置中检测Facebook登录状态？(Is it possible to detect facebook log in status in iphone's settings?)

 如果results只需要从页面1到页面2可用，而不是从页面2返回页面1，则以下内容将起作用： 
 
$('#island').change(function() {

  var selectedValue = $(this).val();
  // only do ajax if there is a value
  if (selectedValue) {
    jQuery.ajax({
      type: 'POST',
      data: {
        action: 'cfd_map',
        option: selectedValue
      },
      url: "xxxxxx",
      success: function(data) {
        $('.results').html(data).fadeIn('slow');
      }
    });
  }
  // now trigger change 
}).change();
 
 它只是在处理程序声明后触发更改。 触发更改将使ajax调用来获得结果 
 
 由于服务器已经在第2页上设置了值，所以不应该有其他本地存储需要 - 除非这需要双向工作 

If results only need to be available going from page 1 to page 2 and not going back to page 1 from page 2 then following will work:
 
$('#island').change(function() {

  var selectedValue = $(this).val();
  // only do ajax if there is a value
  if (selectedValue) {
    jQuery.ajax({
      type: 'POST',
      data: {
        action: 'cfd_map',
        option: selectedValue
      },
      url: "xxxxxx",
      success: function(data) {
        $('.results').html(data).fadeIn('slow');
      }
    });
  }
  // now trigger change 
}).change();
 
It simply triggers the change after the handler is declared. Triggering the change will then make the ajax call to get results
 
Since the server already sets value on page 2 there should be no other local storage needed - unless this needs to work both ways