关于jquery的$.ajax发接口的同步与异步问题

Posted 2020-08-10

1.在使用$.ajax发接口时想对返回数据做一些处理后拿到其他方法中使用

　　发请求函数如下：

function getProjectName(projectId){
        project.projectName = [];
        $.ajax({
            type: conf.GET,
            url: conf.API_qryProjectList+"?projectId="+projectId,
            dataType: "JSON"
        }).done(function(data) 
            console.log("执行getprijectName的done");
        });
    }

　　使用时代码如下：

function qryTaskInfo(projectId) {
        $.ajax({
            type: conf.GET,
            url: conf.API_qryTaskList+"?myTaskFlag="+projectId+"&userId="+conf.userId,
            dataType: "JSON"
        }).done(function(data) {
            project.taskList = data.taskList;
            
            var taskList = project.taskList;
            var projectArrays = [];
            var projectIdArrays = [];
            for(var i = 0; i < taskList.length; i++) {
                projectId = taskList[i].projectId;
                if (!isContainProjectId(projectIdArrays, projectId)) {
                    var projectObject = {"projectId": projectId + ""};
                    projectIdArrays.push(projectObject);
                    console.log("调用getProjectName");
                    getProjectName(projectId);
                    console.log("调用getUserByProjectId");
                    getUserByProjectId(projectId);
                    console.log(project.projectName);
                    console.log(project.projectUsers);
                    console.log("-----------");
                    var pName = {"projectName": project.projectName+""};
                    var pUsers = {"projectUsers": project.projectUsers+""};
                    projectIdArrays.push(pName);
                    projectIdArrays.push(pUsers);
                    console.log(pName);
                    console.log(pUsers);
                }
            }
            console.log("huhx projectids: " + projectIdArrays);
            var hasFinish = 0, hasComplete = 0, total = 0,projectName,users;
            for(var i = 0; i < projectIdArrays.length; i++) {
                for(var j = 0; j < taskList.length; j++) {
                    if (projectIdArrays[i].projectId == taskList[j].projectId) {
                        total ++;
                        if (taskList[j].status == "1") {
                            hasFinish++;
                        } else if (taskList[j].status == "3") {
                            hasComplete++;
                        }
                        projectIdArrays[i].hasFinish = hasFinish;
                        projectIdArrays[i].hasComplete = hasComplete;
                        projectIdArrays[i].total = total;
                    }
                }
                projectArrays.push(projectIdArrays[i]);
            }
            console.log("huhx arrays: " + projectArrays);
            projectList=projectArrays;
            //console.log(data);
        });
    }

　　执行结果：

　　问题：

　　　　在接口已发送和接口返回数据这段时间内执行了其他js代码，导致我在done中做的处理都没及时生效。

　　解决方法：

　　　　在请求参数中添加async:false，设置为同步发送请求。

　添加之后控制台：