ajax error的报错提示

//error: function (XMLHttpResponse, textStatus, errorThrown) {
// console.log("1 异步调用返回失败,XMLHttpResponse.readyState:" + XMLHttpResponse.readyState);
// console.log("2 异步调用返回失败,XMLHttpResponse.status:" + XMLHttpResponse.status);
// console.log("3 异步调用返回失败,textStatus:" + textStatus);
// console.log("4 异步调用返回失败,errorThrown:" + errorThrown);
//}