最近写一个新页面，涉及到异步问题，为了获得异步过程中的数据，以下分享两种方法；
两种方法一句话总结：
方法一，Http请求后调用.then实现response的数据同步，然后根据resp接着处理；
方法二，使用ES6中的Promise语法糖，实现异步等待resp；
方法一的代码：
其中invokeJsonRpc(RDS_CONFIG.APOLLO_CMDB_ENDPOINT_V3, "query.aggregate", queryParams)会发生一次HTTP请求
$("#submitFlushAll").on("click",function () { ???????let clusterId = $("#cluster-id").val(); ???????const queryParams = { ???????????graph: `graph g { ?redisCluster: RedisCluster[ id = "${clusterId}" ];}`, ???????????fields: [["redisCluster.name", "redisCluster.id", "redisCluster.used_memory"]] ???????}; ???????invokeJsonRpc(RDS_CONFIG.APOLLO_CMDB_ENDPOINT_V3, "query.aggregate", queryParams).then(resp =>{ ???????????let usedMemory = resp.result.children[0].data["redisCluster.used_memory"]; ???????????let clusterName = $("#cluster-name").val(); ???????????let details = { ???????????????usedMemory : usedMemory, ???????????????clusterName : clusterName, ???????????}; ???????????let request = { ???????????????title: `Redis清除${clusterName}的所有数据`, ???????????????applicant: $("#username").val(), ???????????????projectId: Number($("#project-id").val()), ???????????????createTime: moment().format("YYYY-MM-DD HH:mm:ss"), ???????????????resourceType: REDIS_JIGSAW_RESOURCE_TYPE, ???????????????operationType: "redis_flush_all", ???????????????resource: Number($("#resource-id").val()), ???????????????sensitive: false, ???????????????audit: true, ???????????????carbonCopy: null, ???????????????details: JSON.stringify(details), ???????????????extension: null ???????????}; ???????????submitJigsawWorkorder(request); ???????});方法二的代码：
注意Promise容器的构造，以及点击事件的处理函数为异步；
???$("#submitFlushDatabase").on("click", async function () { ???????let clusterId = $("#cluster-id").val(); ???????let usedMemoryPromise = fetchUsedMemeory(clusterId); ???????let usedMemory = await Promise.all([usedMemoryPromise]); ???????let databaseNumber = $("#inputDatabaseNumber").val(); ???????let clusterName = $("#cluster-name").val(); ???????let details = { ???????????databaseNumber : databaseNumber, ???????????clusterName : clusterName, ???????????usedMemory : usedMemory, ???????}; ???????let request = { ???????????title: `Redis清除指定DB，指定DB：${databaseNumber}`, ???????????applicant: $("#username").val(), ???????????projectId: Number($("#project-id").val()), ???????????createTime: moment().format("YYYY-MM-DD HH:mm:ss"), ???????????resourceType: REDIS_JIGSAW_RESOURCE_TYPE, ???????????operationType: "redis_flush_database", ???????????resource: Number($("#resource-id").val()), ???????????sensitive: false, ???????????audit: true, ???????????carbonCopy: null, ???????????details: JSON.stringify(details), ???????????extension: null ???????}; ???????submitJigsawWorkorder(request); ???}); ???async function fetchUsedMemeory(clusterId) { ???????const queryParams = { ???????????graph: `graph g { ?redisCluster: RedisCluster[ id = "${clusterId}" ];}`, ???????????fields: [["redisCluster.name", "redisCluster.id", "redisCluster.used_memory"]] ???????}; ???????let resp = await invokeJsonRpc(RDS_CONFIG.APOLLO_CMDB_ENDPOINT_V3, "query.aggregate", queryParams); ???????let usedMemory = resp.result.children[0].data["redisCluster.used_memory"]; ???????return usedMemory; ???}两种方法的比较：使用Promise语法糖会使得代码结构性更加清晰，易读。
Promise学习可以参考这个链接：https://blog.csdn.net/major_zhang/article/details/79154287
jQuery中异步问题：数据传递
原文地址：https://www.cnblogs.com/jayinnn/p/9957134.html