Django使用jquery ajax post数据出现403错误

Django开启用户验证或者权限验证的时候容易出现403错误。使用ajax向django post数据时发生403错误时，Django官方给出了一段js代码解决问题，将js代码单独存储为一个独立的js文件，然后在引用jquery的js文件引入之后再引入该js文件即可。

$(document).ajaxSend(function(event, xhr, settings) { 
  function getCookie(name) { 
    var cookieValue = null; 
    if (document.cookie && document.cookie != '') { 
      var cookies = document.cookie.split(';'); 
      for (var i = 0; i < cookies.length; i++) { 
        var cookie = jQuery.trim(cookies[i]); 
        // Does this cookie string begin with the name we want? 
        if (cookie.substring(0, name.length + 1) == (name + '=')) { 
          cookieValue = decodeURIComponent(cookie.substring(name.length + 1)); 
          break; 
        } 
      } 
    } 
    return cookieValue; 
  } 
  
  function sameOrigin(url) {
    // url could be relative or scheme relative or absolute 
    var host = document.location.host; // host + port 
    var protocol = document.location.protocol; 
    var sr_origin = '//' + host; 
    var origin = protocol + sr_origin; 
    // Allow absolute or scheme relative URLs to same origin 
    return (url == origin || url.slice(0, origin.length + 1) == origin + '/') || (url == sr_origin ||     url.slice(0, sr_origin.length + 1) == sr_origin + '/') || 
      // or any other URL that isn't scheme relative or absolute i.e relative. 
      !(/^(\\/\\/|http:|https:).*/.test(url)); 
  } 
  
  function safeMethod(method) { 
    return (/^(GET|HEAD|OPTIONS|TRACE)$/.test(method)); 
  } 
  
  if (!safeMethod(settings.type) && sameOrigin(settings.url)) { 
    xhr.setRequestHeader("X-CSRFToken", getCookie('csrftoken')); 
  } 
});