JavaScript-算术运算符

在 JavaScript 中的算术运算符如下

  • +
  • -
  • *
  • /
  • %

算术运算符的优先级和结合性

* / % 的优先级要高于 + -，无论是 + - * / %都是左结合性(从左至右计算)

加

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Demo</title>
    <script>
        let resultOne = 1 + 1;
        console.log(resultOne);

        let num1, num2;
        num1 = 3;
        num2 = 5;

        let resultTwo = num1 + num2;
        console.log(resultTwo);

        let resultThree = num1 + 3;
        console.log(resultThree);
    </script>
</head>
<body>
</body>
</html>

减

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Demo</title>
    <script>
        let resultOne = 2 - 1;

        console.log(resultOne);

        let numOne, numTwo;
        numOne = 3;
        numTwo = 9;

        let resultTwo = numOne - numTwo;
        console.log(resultTwo);
    </script>
</head>
<body>
</body>
</html>

乘

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Demo</title>
    <script>
        let result = 1 + 2 * 5;
        
        console.log(result);
    </script>
</head>
<body>
</body>
</html>

除

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Demo</title>
    <script>
        let result = 1 / 3;

        console.log(result);
    </script>
</head>
<body>
</body>
</html>

取余

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Demo</title>
    <script>
        /*
        被除数  除数   商  余数
        10   ÷ 3   =  3   1
        */

        let result = 10 % 3;
        console.log(result);
    </script>
</head>
<body>
</body>
</html>

posted @ 2021-03-25 10:59  BNTang  阅读(3)  评论(0)    收藏  举报