javascript运算符_JavaScript模，除法，余数和其他数学运算符的解释

javascript运算符

JavaScript provides the user with five arithmetic operators: +, -, *, / and %. The operators are for addition, subtraction, multiplication, division and remainder (or modulo), respectively.

JavaScript为用户提供了五个算术运算符： + ， - ， * ， /和% 。 运算符分别用于加法，减法，乘法，除法和余数(或模)。

加成 (Addition)

Syntax

句法

a + b

a + b

Usage

用法

2 + 3
// returns 5
true + 2
// interprets true as 1 and returns 3
false + 5
// interprets false as 0 and returns 5
true + "bar"
// concatenates the boolean value and returns "truebar"
5 + "foo"
// concatenates the string and the number and returns "5foo"
"foo" + "bar"
// concatenates the strings and returns "foobar"

Hint: There is a handy increment) operator that is a great shortcut when you’re adding numbers by 1.

提示：有一个方便的递增 )运算符，当您将数字加1时，这是一个很好的快捷方式。

减法 (Subtraction)

Syntax

句法

a - b

a - b

Usage

用法

2 - 3
// returns -1
3 - 2
// returns 1
false - 5
// interprets false as 0 and returns -5
true + 3
// interprets true as 1 and returns 4
5 + "foo"
// returns NaN (Not a Number)

Hint: There is a handy decrement) operator that is a great shortcut when you’re subtracting numbers by 1.

提示：有一个方便的递减 )运算符，当您将数字减1时，这是一个很好的捷径。

乘法 (Multiplication)

Syntax

句法

a * b

a * b

Usage

用法

2 * 3
// returns 6
3 * -2
// returns -6
false * 5
// interprets false as 0 and returns 0
true * 3
// interprets true as 1 and returns 3
5 * "foo"
// returns NaN (Not a Number)
Infinity * 0
// returns NaN
Infinity * Infinity
// returns Infinity

师 (Division)

Syntax

句法

a / b

a / b

Usage

用法

3 / 2
// returns 1.5
3.0 / 2/0
// returns 1.5
3 / 0
// returns Infinity
3.0 / 0.0
// returns Infinity
-3 / 0
// returns -Infinity
false / 5
// interprets false as 0 and returns 0
true / 2
// interprets true a 1 and returns 0.5
5 + "foo"
// returns NaN (Not a Number)
Infinity / Infinity
// returns NaN

余 (Remainder)

Syntax

句法

a % b

a % b

Usage

用法

3 % 2
// returns 1
true % 5
// interprets true as 1 and returns 1
false % 4
// interprets false as 0 and returns 0
3 % "bar"
// returns NaN

增量 (Increment)

Syntax

句法

a++ or ++a

a++ or ++a

Usage// Postfix x = 3; // declare a variable y = x++; // y = 4, x = 3// Prefix var a = 2; b = ++a; // a = 3, b = 3

用法 //后缀x = 3; //声明变量y = x ++; // y = 4，x = 3 //前缀var a = 2; b = ++ a; // a = 3，b = 3

减量 (Decrement)

Syntax

句法

a-- or --a

a-- or --a

Usage// Postfix x = 3; // declare a variable y = x—; // y = 3, x = 3// Prefix var a = 2; b = —a; // a = 1, b = 1 !Important! As you can see, you cannot perform any sort of operations on Infinity.

用法 //后缀x = 3; //声明变量y = x—; // y = 3，x = 3 //前缀var a = 2; b = -a; // a = 1，b = 1 重要！ 如您所见，您无法在Infinity上执行任何类型的操作。

有关JavaScript中数学的更多信息： (More on math in JavaScript:)

• JavaScript math functions explained

  JavaScript数学函数解释

• JavaScript's math.random() method explained

  JavaScript的math.random()方法说明

翻译自: https://www.freecodecamp.org/news/javascript-arithmetic-math-operators-explained/

javascript运算符