gistfile1.js

$.fn.ajaxLink = function() {
  $(this).click(function(){
      $.ajax({
        url: $(this).attr('href'),
        dataType: 'script',
        });
      return false;
      });
};

function initall()
{
  $('.ajaxlink').ajaxLink();
}

$(document).ready(function() {
    initall();
    })

//if I call `initall();` once ,when I click a link will cause one ajax request
$(document).ready(function() {
    initall();
    initall();
    })
//but when I call `initall();` twice,when I click the link will cause two ajax request
//how Can click one link only cause one ajax request? no matter how much times call `initall()`