Based on the call function in JS, the function name with parentheses and without parentheses difference _javascript tips

Sample code:

<span style= "FONT-SIZE:18PX;" >function hi () { 
 var a = 1; 
 return function () {
 console.log (a++);
 }   
;}; var aaa = hi ();
var bbb = hi;
</span>

As above code:

AAA is to assign the running result of hi () to it, that is, the anonymous function returned by return, when there is a closure, the same a,aaa () that is accessed each time the AAA is invoked () results in the first run of 1, and the second time 2

And BBB is going to assign the HI function name to it, then call BBB () and return a function expression, that is, function () {Console.log (a++)};

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