Easy to understand, distinguish between ++i and I++

The most frequently used is i++ This variable increases by itself 1 In the form of . In fact, if it's just for variables i Self increasing 1 Words ,i++ and ++i The effect is the same .

var a = 1;
	a++;
console.log(a)   // 2

var b = 1;
	++b;
console.log(b)   // 2

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But when it is necessary operation when ,i++ and ++i It makes a big difference .
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var c = 1;
var result1 = c++ + 2;
console.log(result1)  // 3
					  //  The usual explanation ：c Participate in the operation and then increase 
					  //  My explanation ： That's true , But it can be understood that , Big guy Jean c Go and 2 Engage in war （ operation ）
					  //  Then fight （ operation ） After finishing , promote c Level of （ Self increasing 1）.

var d = 1;
var result2 = ++d + 2;
console.log(result2)  // 4
					  //  The usual explanation ：d First increase and then participate in the operation 
					  //  My explanation ： That's true , But it can be understood that , Big guy Jean d Go and 2 Engage in war （ operation ）,
					  //  And let d Upgrade level （ Self increasing 1） I'll talk to you later 2 Against the , Or you won't be able to fight .