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我有一个全局变量“结果”,它是一个字符串,它将被运行进程的两个函数使用,并将其输出附加到“结果”变量。 但是,这些函数需要时间来处理并返回结果。以下是代码的当前格式。调用函数按顺序存储结果
var results = 'Results: ';
router.get('/',function(req,res){
app1.processImage(path, function(err, output){
console.log('app1 processing completed');
results = results+'app1 result:' + output;
});
app2.processImage(path, function(err, output){
console.log('app2 processing completed');
results = results+'app2 result:' + output;
});
console.log('Both processes are completed');
console.log(results);// none of the results printed.
});
当我尝试打印结果时,它还没有输出。 程序产生这样
电流输出输出:
Both the processes are completed
Results:
app2 processing completed
app1 processing completed
预期输出:
app1 process completed
app2 process completed
Both the processes are completed
Results: app1 result : true , app2 result:true
注意,电流输出结果是空的,因为功能被尚未处理。我怎样才能得到正确存储在变量中的结果?
可能重复[如何从异步调用返回响应?](http://stackoverflow.com/questions/ 14220321 /如何-DO-I-返回的响应,从-的异步调用) –