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33、断点调试 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> let num = 10 num = num + 1 console.log(num) // F12 Sources 单击 刷新 鼠标划过去 </script> </body> </html> -
32、简单计算器案例 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> // 1、用户输入 两个数字 + 操作符号 + - * / let num1 = +prompt('请你输入第一个数字：') let num2 = +prompt('请你输入第二个数字：') let sp = prompt('请你输入 + - * / 其中一个符号') // 2、判断输出 switch (sp) { case '+': alert(`${num1} + ${num2} = ${num1 + num2}`) break case '-': alert(`${num1} - ${num2} = ${num1 - num2}`) break case '*': alert(`${num1} * ${num2} = ${num1 * num2}`) break case '/': alert(`${num1} / ${num2} = ${num1 / num2}`) break default: alert(`你干嘛哎呦，请输入 + - * /`) } </script> </body> </html>
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31、switch语句 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> switch (1) { case 1: console.log('您选择的是1') break //退出 switch case 2: console.log('您选择的是2') break //退出 switch case 3: console.log('您选择的是3') break //退出 switch default: console.log('没有符合条件的'); } </script> </body> </html>
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30、数字补0 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> // 1、用户输入 let num = prompt('请输入一个数字：') // 2、判断输出-小于10的才补0 // num = num < 10 ? 0+num : num num = num >= 10 ? num : 0 + num alert(num) </script> </body> </html>
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29、求最大值案例 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> // // 1、用户输入 // let num1 = +prompt('请输入第一个数：') // let num2 = +prompt('请输入第二个数：') // // 2、判断输出-三元运算符 // if (num > num2) { // alert(num1) // }else{ // alert(num2) // } num1 > num2 ? alert(`最大值是:${num1}`) : alert(`最大值是：${num2}`) </script> </body> </html>
