js closure implements counting by seconds_javascript skills

Here is a little trick to share with you. Use javascript closure to count by seconds. The code is as follows:

var i =1;
for(i; i<10; i++){
  (function(num){
   setTimeout(function(){
     console.log(num);
     }, num*1000);
   })(i);
}

The focus is on the scope of closures.

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