Node.js功能范围-Azure表
所以我有一个这样的代码Node.js功能范围-Azure表,node.js,azure-table-storage,Node.js,Azure Table Storage,所以我有一个这样的代码 var query = new storage.TableQuery().where('PartitionKey eq ?', req.body.RowKey._); storageClient.queryEntities(fieldtable, query, null, function (error, result, response) { var modelEntries = {}; var enumList = {}; var
var query = new storage.TableQuery().where('PartitionKey eq ?', req.body.RowKey._);
storageClient.queryEntities(fieldtable, query, null, function (error, result, response) {
var modelEntries = {};
var enumList = {};
var enumName;
modelEntries = result.entries;
console.log(modelEntries);
for (var i = 0; i < modelEntries.length; i++){
if (result.entries[i].fielddatatype._ === "Enum"){
enumName = result.entries[i].fieldname._;
query = new storage.TableQuery().where('EnumName eq ?', enumName);
storageClient.queryEntities(enumvalue, query, null, function (error, result, response) {
enumList[enumName] = result.entries;
});
}
}
res.end(JSON.stringify(enumList));
});
当我调试数据时,EnumList正在接收数据。但一旦它超出了函数的范围,它就为空。我认为这是一个函数范围问题,但我不太确定
- result.entries有结果
- fieldname也有数据,所以这两件事不是问题所在
res.end()
在for循环结束之前执行。在这种情况下,我建议查看并使用async.eachOf(…)
。它允许您针对一系列“内容”运行异步调用,并在所有异步调用完成后为您提供运行函数的位置
var async = require('async');
// ...
async.eachOf(modelEntries, function(value, key, next) {
if (result.entries[key].fielddatatype._ === "Enum") {
enumName = result.entries[key].fieldname._;
query = new storage.TableQuery().where('EnumName eq ?', enumName);
storageClient.queryEntities(enumvalue, query, null, function (error, result, response) {
enumList[enumName] = result.entries;
next();
});
}
}, function(err) {
res.end(JSON.stringify(enumList));
});
var async = require('async');
// ...
async.eachOf(modelEntries, function(value, key, next) {
if (result.entries[key].fielddatatype._ === "Enum") {
enumName = result.entries[key].fieldname._;
query = new storage.TableQuery().where('EnumName eq ?', enumName);
storageClient.queryEntities(enumvalue, query, null, function (error, result, response) {
enumList[enumName] = result.entries;
next();
});
}
}, function(err) {
res.end(JSON.stringify(enumList));
});