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asyncExample.js

@@ -0,0 +1,31 @@
+"use strict";
+
+var evenDouble = function(v, callback){
+    var start = new Date();    
+   setTimeout(function(){
+        var end  = new Date();
+        var time = end.getTime() - start.getTime();
+
+       if (v % 2 == 0){
+           callback.call(null, 1, v*2, time);
+       }else{
+           callback.call(null, 0, -1, time);
+       }
+   },generateNumber(1,10) * 100); 
+}
+
+function generateNumber(start,end){
+    return Math.floor(Math.random() * end) + start  ;
+}
+
+var handler =  function(err,result,time){
+    if (err){
+        console.log("ERR");
+    }else{
+        console.log("result: " + result + " in " + time + "ms");
+    };
+}; 
+
+for(let i = 0; i < 10; i++)    {
+    evenDouble(i,handler);
+}