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46、数组求和以及平均值 copy <!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 arr = [2,6,1,7,4] // max 里面需要存的是最大值 let max = arr[0] // 要存放的是最小值 let min = arr[0] // 遍历数组 for (let i = 1; i < arr.length; i++){ // 如果max 比数组元素里面的值小，我们就要把这个数组元素赋值给max if(max < arr[i]){ max = arr[i] } // 如果 min比数组元素大，我们就需要把数组元素给min if (min > arr[i]){ min = arr[i] } } // 输出max console.log(max) console.log(min) </script> </body> </html> -
46、数组的基本使用 <!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、字面量声明数组 // let arr = [1, 2, 3, 4] // 2、使用new Array 构造函数声明 了解 // let arr = new Array(1,2,3,4) </script> </body> </html>
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45、九九乘法表 <!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> <style> span{ display: inline-block; width: 80px; padding: 5px 10px; border: 1px solid pink; margin: 2px; border-radius: 5px; box-shadow: 2px 2px 2px rgb(255, 192, 203); text-align: center; color: hotpink; } </style> </head> <body> <script> // 外层循环控制行数 for (let i = 1; i <= 9; i++){ // 内层循环控制列数（几个星星） for (let j = 1; j <= i; j++){ document.write(`<span>${j} x ${i} = ${i * j}</span>`) } // 换行 document.write('<br>') } </script> </body> </html>
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44、打印直角三角形 copy <!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> // 外层循环控制行数 for (let i = 1; i <= 5; i++){ // 内层循环控制列数（几个星星） for (let j = 1; j <= i; j++){ document.write('*') } // 换行 document.write('<br>') } </script> </body> </html>
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43、星星案例 <!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> // // 外层循环打印行数 // for (let i = 1; i <= 5; i++){ // // 里层循环打印几个星星 // for (let j = 1; j <= 5; j++){ // document.write('*') // } // document.write('<br>') // } // 外层循环打印行数 let row = +prompt('请输入行数：') let col = +prompt('请输入列数：') for (let i = 1; i <= row; i++){ // 里层循环打印几个星星 for (let j = 1; j <= col; j++){ document.write('*') } document.write('<br>') } </script> </body> </html>
