ES6 算术运算符

var num1 = 10
var num2 = 2
var res = 0

res = num1+num2
console.log("Sum:        "+res);

res = num1-num2;
console.log("Difference: "+res)

res = num1*num2
console.log("Product:    "+res)

res = num1/num2
console.log("Quotient:   "+res)

res = num1%num2
console.log("Remainder:  "+res)

num1++
console.log("Value of num1 after increment "+num1)

num2--
console.log("Value of num2 after decrement "+num2)