九九乘法表：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=sc, initial-scale=1.0">
<title>九九乘法表</title>
<style>
span {
height: 30px;
width: 80px;
display: inline-block;
border: 1px solid #ccc;
/* padding: 1px 2px; */
margin: 2px;
text-align: center;
line-height: 30px;
box-shadow: 2px 1px 1px rgba(56, 56, 127, 0.3);
}
</style>
</head>
<body>
<h3>九九乘法表</h3>
<script>
for (let i = 1; i <= 9; i++) {
for (let j = 1; j <= i; j++) {
document.write(`<span>${j}*${i}=${i * j} </span>`)
}
document.write('<br>')
}
</script>
</body>
</html>运行结果：
根据数据生成柱形图：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>综合案例-根据数据生成柱形图素材</title>
<style>
* {
margin: 0;
padding: 0;
}
.box {
display: flex;
width: 700px;
height: 300px;
border-left: 1px solid pink;
border-bottom: 1px solid pink;
margin: 50px auto;
justify-content: space-around;
align-items: flex-end;
text-align: center;
}
.box>div {
display: flex;
width: 50px;
background-color: pink;
flex-direction: column;
justify-content: space-between;
}
.box div span {
margin-top: -20px;
}
.box div h4 {
margin-bottom: -35px;
width: 70px;
margin-left: -10px;
}
</style>
</head>
<body>
<script>
let arr = []
for (let i = 1; i <= 4; i++) {
arr.push(prompt(`请输入第${i}季度的数据`))
}
document.write(`<div class="box">`)
for (i = 0; i < arr.length; i++) {
document.write(`
<div style="height: ${arr[i]}px;">
<span>${arr[i]}</span>
<h4>第${i}季度</h4>
</div>`)
}
document.write(`</div>`)
</script>
</body>
</html>运行结果：
写一个程序，要求如下（★★）
-
需求1：让用户输入五个有效年龄（0-100之间），放入数组中
- 必须输入五个有效年龄年龄，如果是无效年龄，则不能放入数组中
-
需求2：打印出所有成年人的年龄 (数组筛选)
-
需求3：打印出所有人总年龄 （累加）
-
需求4：打印出所有人的平均年龄 （累加）
-
需求5：打印出最大年龄和最小年龄 （最大值）
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>练习题一</title> </head> <body> <script> let arr = [] while (arr.length < 5) { let age = +prompt(`请您输入五个有效年龄（0-100之间）`) if (age >= 0 && age <= 100) { arr.push(age) } } document.write(`${arr}\
`); for (let i = 0; i < arr.length; i++) { if (arr[i] >= 18) { document.write(`已经成人的年纪是${arr[i]}岁\
`) } } let sum = 0 for (let i = 0; i < arr.length; i++) { sum += arr[i] } document.write(`所有人的总年龄为${sum}\岁
`) document.write(`所有人的平均年龄为${sum / arr.length}岁\
`) let max = arr[0] let min = arr[0] for (let i = 0; i < arr.length - 1; i++) { if (arr[i] < arr[i + 1]) { max = arr[i + 1] } if (arr[i] > arr[i + 1]) { mIn = arr[i + 1] } } document.write(`最大年龄为${max}岁\
`) document.write(`最小年龄为${min}岁\
`) </script> </body> </html>
运行结果（忽略输入过程）：
找出数组中 元素为10的下标，有则打印该下标，没有则打印-1
-
例如: [88,20,10,100,50] 打印 2
-
例如: [88,20,30,100,50] 打印-1
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>练习题二</title> </head> <body> <script> let arr = [88, 20, 10, 100, 50] let re = -1 for (let i = 0; i < arr.length; i++) { if (arr[i] === 10) { re = i break } } document.write(re) </script> </body> </html>核心练习：
-
需求：
根据用户输入的个数，页面可以渲染对应王者荣耀永雄的个数
效果如下：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>核心练习</title> <style> * { margin: 0; padding: 0; }</head> <body>li { list-style: none; } .box { display: flex; flex-wrap: wrap; width: 540px; margin: 20px auto; } .box li { width: 100px; height: 100px; margin: 0 10px 10px 0; } .box li:nth-child(5n+1) { margin-right: 0; } .box li img { width: 100%; height: 100%; border: 2px solid #258DF2; border-radius: 10px 0 10px 0; } </style></body> </html><script> let arr = [ './核心练习作业素材/images/1.webp', './核心练习作业素材/images/2.webp', './核心练习作业素材/images/3.webp', './核心练习作业素材/images/4.webp', './核心练习作业素材/images/5.webp', './核心练习作业素材/images/6.webp', './核心练习作业素材/images/7.webp', './核心练习作业素材/images/8.webp', './核心练习作业素材/images/9.webp', './核心练习作业素材/images/10.webp', './核心练习作业素材/images/11.webp', './核心练习作业素材/images/12.webp', './核心练习作业素材/images/13.webp', './核心练习作业素材/images/14.webp', './核心练习作业素材/images/15.webp', './核心练习作业素材/images/16.webp', './核心练习作业素材/images/17.webp', './核心练习作业素材/images/18.webp', './核心练习作业素材/images/19.webp', './核心练习作业素材/images/20.webp' ] let num = +prompt('请输入显示的英雄个数1~20之间：') for (let i = 0; i < num; i++) { document.write(` <li> <img src="${arr[i]}" alt=""> </li> `) } </script> </ul>
运行结果：
