8-8 jQueryAjax拦截器

      $.ajaxSetup({
        contentType: "application/x-www-form-urlencoded;charset=utf-8",
        //请求发送之前
        beforeSend: function (xhr) {
          console.log("false");
          xhr.setRequestHeader("Authorization", "Token 123");
        },
        //请求完成之后
        complete: function (XMLHttpRequest, textStatus) {
          console.log("true");
          //通过XMLHttpRequest取得响应头，sessionstatus，
          var sessionstatus = XMLHttpRequest.getResponseHeader("sessionstatus");
          if (sessionstatus == "timeout") {
            //如果超时就处理 ，指定要跳转的页面(比如登陆页)
            window.location.replace("/login/index.php");
          }
        },
      });