Function done

2.0.3/Ajax.js:788–898

(status, nativeStatusText, responses, headers)

        // 清除本次请求用到的变量、解析状态码&状态描述、执行异步回调函数队列、执行complete队列、触发全局Ajax事件
        // status: -1 没有找到请求分发器
        function done(status, nativeStatusText, responses, headers) {
            var isSuccess, success, error, response, modified,
                statusText = nativeStatusText;

            // Called once
            if (state === 2) {
                return;
            }

            // State is "done" now
            state = 2;

            // Clear timeout if it exists
            if (timeoutTimer) {
                clearTimeout(timeoutTimer);
            }

            // Dereference transport for early garbage collection
            // (no matter how long the jqXHR object will be used)
            transport = undefined;

            // Cache response headers
            responseHeadersString = headers || "";

            // Set readyState
            jqXHR.readyState = status > 0 ? 4 : 0;

            // Determine if successful
            isSuccess = status >= 200 && status < 300 || status === 304;

            // Get response data
            // 得到ajax返回的数据
            if (responses) {
                response = ajaxHandleResponses(s, jqXHR, responses);
            }

            // Convert no matter what (that way responseXXX fields are always set)
            response = ajaxConvert(s, response, jqXHR, isSuccess);

            // If successful, handle type chaining
            if (isSuccess) {

                // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
                if (s.ifModified) {
                    modified = jqXHR.getResponseHeader("Last-Modified");
                    if (modified) {
                        jQuery.lastModified[cacheURL] = modified;
                    }
                    modified = jqXHR.getResponseHeader("etag");
                    if (modified) {
                        jQuery.etag[cacheURL] = modified;
                    }
                }

                // if no content
                if (status === 204 || s.type === "HEAD") {
                    statusText = "nocontent";