JavaScript arithmetic operators in the prefix, suffix and prefix add is to add one after the operati-CodePudding

CodePudding user response:

 
Let a=120 

//a=a + 1=121 
+ + a 

//a=a + 1=122 
+ 

//a=122 
The console. The log (a) 

//b=a + 1=123; A=a + 1=123 
Const=a + b + a 

//c=a, a=a + 1=124 
Const=c + 

//124123123 
The console. The log (a, b, c)

CodePudding user response:

First of all, since the increase/decrease since can only be applied to variables, applied to the numerical value (such as 120 + +) may be an error,
Secondly, since the operator + +, after before the variable or variables, the meaning is the same,

 let counter=120; 
Counter++; 
Or 
+ + counter; 
counter;//121

So is there any difference between them? Yes, but only when we use the + +/- to see when the return value of the difference, in particular, this is the counter back to another variable, this can reflect the difference:
+ + front form returns a new value, but the rear + + return to the original value:

 let counter=120; 
Let a=+ + counter;//+ + front 
a;//121

 let counter=120; 
Let a=counter++;//+ + rear 
a;//120

CodePudding user response:

The

reference 1/f, bubble fish _ response:

 
Let a=120 

//a=a + 1=121 
+ + a 

//a=a + 1=122 
+ 

//a=122 
The console. The log (a) 

//b=a + 1=123; A=a + 1=123 
Const=a + b + a 

//c=a, a=a + 1=124 
Const=c + 

//124123123 
The console. The log (a, b, c)

Thank you for your understand

CodePudding user response:

refer to the second floor FnaticE response:

first of all, since the increase/decrease since can only be applied to variables, applied to the numerical value (such as 120 + +) may be an error,
Secondly, since the operator + +, after before the variable or variables, the meaning is the same,
 let counter=120; 
Counter++; 
Or 
+ + counter; 
counter;//121 
So is there any difference between them? Yes, but only when we use the + +/- to see when the return value of the difference, in particular, this is the counter back to another variable, this can reflect the difference:
+ + front form returns a new value, but the rear + + return to the original value:
 let counter=120; 
Let a=+ + counter;//+ + front 
a;//121 
 let counter=120; 
Let a=counter++;//+ + rear 
a;//120 

Thank you for your understand

CodePudding user response:

+ + a variable since the first add, it is involved in computing, variable + +, the variables involved in calculation first, since the add again