目录：
- 什么是算术运算符？
- 算术运算符有哪些？
一、什么是算术运算符？
运算符是处理数据的基本方法，用来从现有的值得到新的值。JavaScript 提供了多种运算符，覆盖了所有主要的运算。
二、算术运算符有哪些？
- 加法运算符：x + y
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
var num1 = 1;
var num2 = 2;
console.log(num1+num2);//3
</script>
</body>
</html>2. 减法运算符：x – y
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
var num1 = 2;
var num2 = 1;
console.log(num1-num2);//1
</script>
</body>
</html>3. 乘法运算符：x * y
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
var num1 = 2;
var num2 = 1;
console.log(num1*num2);//2
</script>
</body>
</html>4. 除法运算符：x / y
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
var num1 = 9;
var num2 = 3;
console.log(num1/num2);//3
</script>
</body>
</html>5. 余数运算符：x % y
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
var num1 = 9;
var num2 = 3;
console.log(num1%num2);//0
</script>
</body>
</html>