JavaScript_7_运算符

1. 算术运算符

2. 赋值运算符

3. 用于字符串的+运算

如果把字符串与数字相加，结果将成为字符串

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta charset="utf-8" />
</head>
<body>
    <script>
        //算术运算符
        var y = 5;
        var x1 = y + 2;
        var x2 = y - 2;
        var x3 = y * 2;
        var x4 = y / 2;
        var x5 = y % 2;
        x6 = ++y;
        x7 = --y;
        document.write(x1 + " " + x2 + " " + x3 + " " + x4 + " " + x5 + " " + x6 + " " + x7+"</br>");

        //赋值运算符
        var a = 10, b = 5;
        a = b;
        document.write(a+" ");
        a += b;
        document.write(a + " ");
        a -= b;
        document.write(a + " ");
        a *= b;
        document.write(a + " ");
        a /= b;
        document.write(a + " ");
        a %= b;
        document.write(a + "</br>");

        //用于字符串的+运算
        //如果把字符串与数字相加，结果将成为字符串
        x = 5 + 5;
        document.write(x + "</br>");
        x = "5" + "5";
        document.write(x + "</br>");
        x = 5 + "5";
        document.write(x + "</br>");

    </script>
</body>
</html>