.ajaxComplete( handler )
用來(lái)注冊(cè)一個(gè)ajax請(qǐng)求結(jié)束時(shí)執(zhí)行的函數(shù)。
handler格式：
Function( Event event, jqXHR jqXHR, PlainObject ajaxOptions )

$( document ).ajaxComplete(function( event, xhr, settings ) {
  if ( settings.url === "ajax/test.html" ) {
  $( ".log" ).text( "Triggered ajaxComplete handler. The result is " + xhr.responseText );
  }
});