全网最通俗易懂的讲解：同步回调和异步回调

talk is cheap ,show me the code

废话少说，放码过来！

第一种：同步回调

//同步回调
        function callback(){
            console.log("i'm callback function")
        }

        function main(cb){
            console.log("position 1 ");
            cb();
            console.log("position 2 ");
        }
        main(callback);

第二种：异步回调 

        //异步回调
        function callback(){
            console.log("i'm callback function")
        }

        function main(cb){
            console.log("position 1 ");
            setTimeout(cb,1000);
            console.log("position 2 ");
        }
        main(callback);

 

 

 

 

 

 

来源：CSDN

作者：交大彭于晏

链接：https://blog.csdn.net/weixin_42191575/article/details/103592791