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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8" />
- <meta name="viewport" content="width=device-width, initial-scale=1.0" />
- <title>Document</title>
- </head>
- <body>
- <!--
- + - * / %（取余/模）
- -->
- <script>
- var a = 1;
- var b = 2;
- var c = 10;
- var d = 5;
- // console.log(a+b);//3
- // console.log(c-b);//8
- // console.log(a*b);//2
- // console.log(b/a);//2
- // console.log(d % c);//5 去低段位的值
- // console.log(b % c);//2
- // console.log(a % c);//1
- // console.log(c % c);//0
- // console.log(c % 3);//1
- // console.log(a + '1');//11 加法运算 number + string 拼接
- // console.log(a + c); // 11
- // console.log('3'+'12');//312 string + string 拼接
- // console.log(d + true); //6 加法运算中true=1 false=0
- // console.log(b + null)//2
- // console.log(b+undefined)//NaN 非法数字
- // console.log(c-b);//8
- // console.log(c-'4'); //6 减法 string number 执行正常的运算规则
- // console.log(c-'hello');//NaN
- // console.log(c-true);//9 减法运算中true=1 false=0
- // console.log(c-null);//10
- // console.log(c-undefined);//NaN
- // console.log(c*b);//20
- // console.log(c*'4'); //40 乘法 string number 执行正常的运算规则
- // console.log(c*'hello');//NaN
- // console.log(c*false);//0 乘法运算中true=1 false=0
- // console.log(c*null);//0
- // console.log(c*undefined);//NaN
- // console.log(c/b);//5
- // console.log(c/'4'); //2.5 除法 string number 执行正常的运算规则
- // console.log(c/'hello');//NaN
- // console.log(c/false);//Infinity 除法运算中true=1 false=0
- // console.log(c/null);//Infinity
- // console.log(c/undefined);//NaN
- console.log(c % b); //0
- console.log(c % "2"); //2.5 取余 string number 执行正常的运算规则
- console.log(c % "hello"); //NaN
- console.log(c % false); //NaN 取余运算中true=1 false=0
- console.log(c % null); //NaN
- console.log(c % undefined); //NaN
- </script>
- </body>
- </html>
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