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@@ -0,0 +1,59 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>运算符</title>
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+</head>
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+<body>
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+ <script>
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+ var a = 1;
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+ var b = 2;
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+ var c = 10;
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+ var d = 5;
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+ console.log(a+b,'a+b')
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+ console.log(c-d,'c-d')
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+ console.log(a*b,'a*b')
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+ console.log(a/b,'a/b')
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+ // %取余
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+ console.log(b%c,'b%c')
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+
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+ console.log(a + '23')//在加法运算中，number + string 这两种数据类型的时候 进行拼接
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+ console.log(b + '56')//256
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+ console.log('34'+'56')//在加法运算中，都是字符串时进行拼接
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+ console.log('ab'+b)//ab2
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+ console.log(true + c)//number时 true => 1(number) 11
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+ console.log(true + '34')//string时 true34
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+ console.log(true + false)//boolean时 true=>1 false=>0 1
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+ console.log(null + c)// 10
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+ console.log(undefined + c)//NaN 非法数字 无法运算
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+
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+ console.log(c-d)//5 在减法运算中 number类型时 正常的减法运算
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+ console.log(c - '2')//8在减法运算中 number string(数字) 进行数据类型换算 可以进行减法运算
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+ console.log(c - '哈哈哈')//NaN
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+ console.log(c - 'hahaha')//NaN
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+
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+ console.log(c - true)//9
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+ console.log(c - null)//10
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+ console.log(c - undefined)//NaN
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+
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+ console.log(c * '2')// 20
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+ console.log(c * '哈哈哈')//NaN
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+ console.log(c * 'hahaha')//NaN
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+ console.log(c * d) // 50
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+ console.log(c * false)// 0
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+ console.log(c * null)// 0
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+ console.log(c * undefined)//NaN
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+
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+
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+ console.log(c / '2')//5
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+ console.log(c / 'hahah')//NaN
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+ console.log(c / false)//Infinity
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+ console.log(c / true)//10
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+ console.log(c / null)//Infinity
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+ console.log(c / undefined)//NaN
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+
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+
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+ </script>
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+</body>
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+</html>
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