自增 (++)

自增运算符 (++) 将其操作数递增（加1）并返回一个值。

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Operator: x++ or ++x

如使用后置（Postfix）自增，操作符在操作数后（例如  x++）， 操作数将在自增前返回。

如使用前置（Prefix）自增，操作符在操作数前（例如 ++x）， 操作数将先自增后返回。

let x = 3;
y = x++;

// y = 3
// x = 4

let a = 2;
b = ++a;

// a = 3
// b = 3

• Addition operator
• Subtraction operator
• Division operator
• Multiplication operator
• Remainder operator
• Exponentiation operator
• Decrement operator
• Unary negation operator
• Unary plus operator