使用async.js的嵌套循环

Question

我想做一个非常简单的代码,我在javascript中有两个嵌套循环,打印出它们当前所在的索引.(它是我想做的其他事情的基础).内循环有一个计时器,因此在打印每个数字之前应等待1秒钟.

我希望这个输出:

outer count: 0
inner count: 0
inner count: 1
inner count: 2
inner count: 3
inner count: 4
in out 
outer count: 1
inner count: 0
inner count: 1
inner count: 2
inner count: 3
inner count: 4
in out

等,但这不会发生.我的代码中有一些明显的错误吗？函数甚至可以嵌套,可以异步吗？请帮忙!:(

到目前为止这是我的代码:

var count = 1;
        async.whilst(
        function() {return count < 5},
        function(callback){


            var icount = 0;

            console.log("outer count:" + count);

            async.whilst(
                function () { return icount < 5; },
                function (callback) {
                    console.log("inner count:" + icount);
                    icount++;
                    setTimeout(callback, 1000);
                },
                function (err) {
                    // 5 seconds have passed
                    console.log("in out");
                }
            );

            count++;

            callback();

        },
        function(err){
            console.log("out out");
        }
        );

Answer 1

var count = 1;
        async.whilst(
        function() {return count < 5},
        function(outer_callback){


            var icount = 0;

            console.log("outer count:" + count);

            async.whilst(
                function () { return icount < 5; },
                function (callback) {
                    console.log("inner count:" + icount);
                    icount++;
                    setTimeout(callback, 1000);
                },
                function (err) {
                    // 5 seconds have passed
                    console.log("in out");
                    outer_callback(); // <--- here
                }
            );

            count++;


        },
        function(err){
            console.log("out out");
        }
        );

async.whilst 没有阻塞,这意味着它们中的所有5个都被安排同时运行.

我所做的改变是,现在在代码中,外循环迭代仅在内循环迭代完成时完成.