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