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JAVA 全系列

Python 全系列

Python入门

Python 深入与提高

Hadoop 分布式文件系统：HDFS（扩展）

Hadoop 分布式计算框架：Mapreduce（扩展）

AIGC人工智能工具全能班

Stable Diffusion（自选模型）AI绘图

大模型全系列

【AI科普】深入浅出人工智能

【AI理论】提示词工程：高效对话与优化技巧

【职场AI】AI在职场中的高效应用场景

【办公AI】DeepSeek接入办公工具实战

【Python入门】零基础快速掌握Python编程

【Java入门】从零开始学Java：基础到实践

【企业实战】如何在项目中集成智能聊天机器人

【AI社交】在微信中接入DeepSeek打造AI女友

【大模型框架】LangChain 与基于RAG构建医疗问答系统

【AI助手与数据可视化】Assistants 与 Streamlit

【大模型本地部署与微调】训练属于你的Deepseek

【编程探秘】解锁AI智能编程工具奥秘

【图像绘图】走进Midjourney图像AI绘图世界

【模绘解析】洞悉Stable Diffusion（自选模型）AI绘图原理

大厂算法特训班

C++特训班

鸿蒙应用开发

大数据全系列

Hadoop 分布式计算MapReduce和资源管理Yarn

人工智能

人工智能基础-Python科学计算和可视化

深度学习-目标检测YOLO(V8正在更新中)实战

微服务

SpringBoot与MybatisPlus

Spring Cloud Alibaba技术栈

租房网（Spring Cloud最新架构）

软件测试全系列

Java编程基础和Java Web开发基础

7u职场软实力

毕设项目

软考中级

软考初级

ROS2机器人开发

计算机考研408

百战万词考研英语

考研英语7000词汇精讲1（1-1000）

考研英语7000词汇精讲2（1000-2000）

考研英语7000词汇精讲3（2000-3000）

考研英语7000词汇精讲4（3000-4000）

考研英语7000词汇精讲5（4000-5000）

考研英语7000词汇精讲6（5000-6000）

考研英语7000词汇精讲7（6000以上）

英文原版报刊选题：《经济学人》选题

英文原版报刊选题：《纽约时报》选题

英文原版报刊选题：《自然nature》选题

英文原版报刊选题：《时代周刊times》选题

英文原版教材：《柏拉图：理想国，西方哲学源头》

考研英语

考研政治

会员可以在此提问，百战程序员老师有问必答

对大家有帮助的问答会被标记为“推荐”
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截止目前，同学们一共提了 132431个问题

时间排序推荐排序

一般怎样初始化卷积核比较好，怎样赋给初始值？

人工智能/第十二阶段：深度学习-图像识别原理/卷积神经网络原理（旧） 19516楼

老师，为什么这个ID的序号会跳了这么多，我数据库已经设置了主键了呀

Python 全系列/第十阶段：Flask百战电商后台项目/Flask百战电商后台项目 19517楼

老师这是什么原因，找了半天也没有找到

JAVA 全系列/第六阶段：项目管理与SSM框架/Mybatis 19518楼

test01 =dict(a=100,b=2)
d = eval("2*a*b+50",test01)
print(d)

老师，eval只能调用字典吗（dict）？把第一行dict 换成 list，会报错。

语法没理解： eval(source[,globals[,locals]])

语法里面不是有列表对象吗？麻烦老师解惑。。。

Python 全系列/第一阶段：Python入门/函数和内存分析 19519楼

除了最后一个prf能点开，其他的都点不开....

JAVA 全系列/第一阶段：JAVA 快速入门/JAVA入门和背景知识 19520楼

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        canvas{
            width: 250px;
            height: 85px;
            border: 1px solid #000;
            margin: 50px auto;
            display: block;
        }
    </style>
</head>
<body>
<canvas></canvas>
</body>
<script>
    var imgs = ["../image/刮刮乐/p_0.jpg","../image/刮刮乐/p_1.jpg"];
    var flag = 0;
    for (var i = 0; i < imgs.length; i++){
        var img = new Image();
        img.src = imgs[i];
        img.onload = function () {
            flag++;
            if (flag === imgs.length){
                callback();
            }
        }
    }
    function callback() {
        var canvas = document.querySelector("canvas");
        var ctx = canvas.getContext("2d");
        var randomNum = Math.floor(Math.random() * 10);
        if (randomNum === 2){
            canvas.style.background = "url(" + imgs[1] + ")";
        }else{
            canvas.style.background = "url(" + imgs[0] + ")";
        }
        // 想让文字显示在覆盖层的上面
        ctx.fillText("请刮开此区域",10,10);
        //覆盖层
        ctx.fillStyle = "#ccc";
        ctx.fillRect(0,0,canvas.width,canvas.height);
        //刮开效果
        canvas.onmousedown = function () {
            canvas.onmousemove = function (e) {
                var eve = e || window.event;
                var mouseX = eve.offsetX;
                var mouseY = eve.offsetY;
                ctx.clearRect(mouseX,mouseY,15,15);
            };
            canvas.onmouseup = document.onmouseup = function () {
                canvas.onmousemove = null;
            }
        }
    }
</script>
</html>

1，下边和右边刮不开

2，怎呢让文字显示在覆盖层的上面

WEB前端全系列/第九阶段：HTML5新特性模块/（旧）H5新特性 19521楼

老师，为什么我写到智能那块布局就不对了，智能部分嵌套的第一张居中大图的div的背景颜色显示在家电部分居中大图的下方，正常应该位于家电整体后面。如果再往后写的话，内容会从家电居中大图开始往下继续撑开页面高度，我不知道是不是语法错了

.content{
    width:100%;
    /*自动找高，清除子元素产生的浮动影响，*/
    overflow:hidden;
    background-color:#f5f5f5;
    padding:4px 0 12px;
}
/* 手机部分 */
/* 手机、家电、智能等标题部分前面居中的大图片样式 */
.phone-nav,.elc-nav{
    width:100%;
    height:120px;
    margin:22px 0;
}
.phone-nav>a>img{
    width:100%;
    height:100%;
}
/* 手机、家电等标题样式 */
.title{
    color:#333;
    font-size:22px;
    font-weight:200;
    line-height:58px;
    text-align:left;
}
/* 手机、家电等标题下a元素样式 */
.title>a{
    color:#424242;
    font-size:12px;
    line-height:58px;
    float:right;
}
/* 鼠标悬停在手机、家电等标题下的a元素上，字体颜色改变 */
.title>a:hover{
    color:#ff6700;
}
.phone-box,.elc-box{
    width:100%;
    height:614px;
}
.phone-box-left{
    width:234px;
    height:614px;
    float:left;
}
.phone-box-left img{
    width:100%;
    height:100%;
}
.phone-box-right{
    width:992px;
    height:614px;
    float:left;
}
.items-1{
    width:234px;
    height:260px;
    background-color:#fff;
    margin:0 0 14px 14px;
    padding:20px 0;
    float:left;
    transition:all .2s linear;
}
.img1{
    width:160px;
    height:160px;
    margin-bottom:18px;
}
.phone-box-left:hover,.phone-box-right>div:hover{
     box-shadow:0 15px 30px rgba(0,0,0,.1);
     transform:translate(0,-2px);
}
.name2{
    width: 214px;
    height: 21px;
    color: #333;
    font-size: 14px;
    line-height: 21px;
    margin: 0 auto 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.desc2{
    width: 214px;
    height: 18px;
    color: #b0b0b0;
    font-size: 12px;
    line-height: 18px;
    margin: 0 auto 10px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.price2{
    color: #ff6700;
    font-size: 14px;
}
/* 家电部分 */
/* 家电标题右侧span元素设置样式。字体大小颜色等样式在手机标题部分的a元素中已设置 */
.title span{
    margin-left:30px;
    transition:border .3s;
}
/* 鼠标悬停在家电标题右侧部分的span元素上，橘色的下边框显示 */
.title span:hover{
    border-bottom:2px solid #ff6700;
}
.items-2{
    width:234px;
    height:300px;
    background-color:#fff;
    margin-left:0;
    padding:0;
    float:left;
}
.items-last{
    width:234px;
    height:300px;
    margin-left:14px;
    float:left;
    position:relative;
}
.items-last>div{
    width:234px;
    height:143px;
    background-color:#fff;
    padding-top:50px;
    box-sizing:border-box;
}
.items-last>div:first-child{
    margin-bottom: 14px;
}
.items-2 img{
    width:100%;
    height:100%;
}
.price2>del{
    color: #b0b0b0;
    margin-left:0.5em;
}
.items-last img{
    width:80px;
    height:80px;
    position:absolute;
    top:32px;
    right:20px;
}
.items-last h3{ 
    position:absolute;
    top:50px;
    left:-40px;
}
.items-last p{
    position:absolute;
    top:76px;
    left:40px;
}
/* 智能部分 */
.smart-nav{
    width:100%;
    height:120px;
    margin:22px 0;
   /* 为什么智能标题上方的smart-nav根据背景颜色是显示在家电标题上方的elc-nav下？
   但smart-nav嵌套的图片却是出现在智能标题上方,且显示不全,页面高度不能由嵌套的图片撑开,侧边滚动条显示已经到底
    */
    background-color:red;
}
.smart-nav>a>img{
    width:100%;
    height:100%;
}
.smart .title{
    height:58px;
    line-height:58px;

}
.smart ul{
  padding-top:16px;
}
.smart li{
    margin-left:30px;
    float:left;
}

   <!--主体部分 -->
    <div class="content">
        <div class="wrap">
            <!-- 手机部分 -->
            <div class="phone">
                <div class="phone-nav">
                    <a href="#">
                    <img src="../images/431e5fd6bfd1b67d096928248be18303.jpg" alt="">
                    </a>
                </div>
                <h2 class="title">手机<a href="#">查看更多</a></h2> 
                <div class="phone-box">
                    <div class="phone-box-left">
                        <a href="#">
                            <img src="../images/c583f2edc613f1be20fa415910b13ce3.jpg" alt="">
                        </a>
                    </div>
                    <div class="phone-box-right">
                        <div class="items-1">
                            <a href="#">
                                <img src="../images/5dc32ec73299ff79556dcd1cf0f0ac11.png" alt="" class="img1">
                                <h3 class="name2">小米MIX FOLD </h3>
                                <p class="desc2">折叠大屏｜自研芯片</p>
                                <p class="price2">9999元起</p>
                            </a>
                        </div>
                        <div class="items-1">
                            <a href="#">
                                <img src="../images/eb69512d9d6430d865d457ec52eebb51.png" alt="" class="img1">
                                <h3 class="name2">小米11 Ultra </h3>
                                <p class="desc2">1.12''GN2｜2K四微曲屏</p>
                                <p class="price2">5999元起</p>
                            </a>
                        </div>
                        <div class="items-1">
                            <a href="#">
                                <img src="../images/34caee2c867bfd8c5e0dc2d8c663e121.jpg" alt="" class="img1">
                                <h3 class="name2">小米11 Pro </h3>
                                <p class="desc2">1.12''GN2｜骁龙888</p>
                                <p class="price2">4999元起</p>
                            </a>
                        </div>
                        <div class="items-1">
                            <a href="#">
                                <img src="../images/cb554f30eaa0316b0a736c3d59f21584.png" alt="" class="img1">
                                <h3 class="name2">小米11 青春版  </h3>
                                <p class="desc2">小米11 青春版 轻薄</p>
                                <p class="price2">2299元起</p>
                            </a>
                        </div>
                        <div class="items-1">
                            <a href="#">
                                <img src="../images/d47f7ecaa04d92bf2790d4a5d53d9099.png" alt="" class="img1">
                                <h3 class="name2">黑鲨4 Pro</h3>
                                <p class="desc2">黑鲨4 Pro</p>
                                <p class="price2">3999元起</p>
                            </a>
                        </div>
                        <div class="items-1">
                            <a href="#">
                                <img src="../images/c21247abf4bc610cd86fe00601b0f766.png" alt="" class="img1">
                                <h3 class="name2">黑鲨4 </h3>
                                <p class="desc2">黑鲨4 磁动力升降肩键</p>
                                <p class="price2">2499元起</p>
                            </a>
                        </div>
                        <div class="items-1">
                            <a href="#">
                                <img src="../images/b3553083a4975325eab6470d94465548.jpg" alt="" class="img1">
                                <h3 class="name2">小米10S </h3>
                                <p class="desc2">骁龙870 | 对称式双扬立体声</p>
                                <p class="price2">3299元起</p>
                            </a>
                        </div>
                        <div class="items-1">
                            <a href="#">
                                <img src="../images/68217751d12b1bfd2f9766e458b5e2dd.jpg" alt="" class="img1">
                                <h3 class="name2">Redmi K40 Pro 系列 </h3>
                                <p class="desc2">骁龙888 / E4 旗舰直屏</p>
                                <p class="price2">2799元起</p>
                            </a>
                        </div>
                    </div>
                </div>
            </div>
            <!-- 家电部分 -->
            <div class="elc">
                    <div class="elc-nav">
                        <a href="#">
                            <img src="../images/41d16e66381cfeda7b6b39ab67678d5e.jpg" alt="">  
                        </a>
                        <h2 class="title">家电
                            <a href="#">
                                <span>热门</span>
                                <span>电视影音</span>
                            </a>
                        </h2>
                        <div class="elc-box">
                            <div class="items-2">
                            <a href="#">
                                <img src="../images/116fc43816b87192be4e67cf762e8da5.jpeg" alt="">
                            </a>
                            </div>
                        <div class="items-1">
                            <a href="#">
                                <img src="../images/03a9e7e96a09d256ca1badeec186c859.jpg" alt=""  class="img1">
                                <h3 class="name2">小米全面屏电视65英寸 E65X </h3>
                                <p class="desc2">全面屏设计</p>
                                <p class="price2">2999元<del class="original">3299元</del></p>
                            </a>
                        </div>
                        <div class="items-1">
                            <a href="#">
                                <img src="../images/20d36fbaa18625e4fe507af31e4e9f83.jpg" alt="" class="img1">
                                <h3 class="name2">全面屏电视E43K  </h3>
                                <p class="desc2">全面屏设计，海量内容</p>
                                <p class="price2">1349元<del class="original">1500元</del></p>
                            </a>
                        </div>
                        <div class="items-1">
                            <a href="#">
                                <img src="../images/9d8674cd21c486feff5328772ab9cf01.jpg" alt="" class="img1">
                                <h3 class="name2">小小米电视4A 70英寸 </h3>
                                <p class="desc2">大屏更享受</p>
                                <p class="price2">3599元<del class="original">3900元</del></p>
                            </a>
                        </div>
                        <div class="items-1">
                            <a href="#">
                                <img src="../images/6bed167fc905bab57dee478bcf1e5e0d.JPG" alt="" class="img1">
                                <h3 class="name2">米家互联网对开门冰箱 540L </h3>
                                <p class="desc2">重磅新品福利特惠</p>
                                <p class="price2">2999元<del class="original">3600元</del></p>
                            </a>
                        </div>
                        <div class="items-2">
                            <a href="#">
                                <img src="../images/dfbdabe36b2d630d57a015e6fb5eb3ea.jpg" alt="">
                            </a>
                        </div>
                        <div class="items-1">
                            <a href="#">
                                <img src="../images/b8c63a2024528fe5410ebe669b7d2407.jpg" alt="" class="img1">
                                <h3 class="name2">Redmi全自动波轮洗衣机1A 8kg</h3>
                                <p class="desc2">一键操作，父母都爱用</p>
                                <p class="price2">849元<del class="original">899元</del></p>
                            </a>
                        </div>
                        <div class="items-1">
                            <a href="#">
                                <img src="../images/74e573c4c0d89048392d14831cc507d5.jpg" alt="" class="img1">
                                <h3 class="name2">Air 13.3" 2019款 </h3>
                                <p class="desc2">新一代独立显卡</p>
                                <p class="price2">6299元</p>
                            </a>
                        </div>
                        <div class="items-1">
                            <a href="#">
                                <img src="../images/7e5f89adf98ab3fccb34012b5209cd58.jpg" alt="" class="img1">
                                <h3 class="name2">米家互联网烟灶套装（天然气）</h3>
                                <p class="desc2">点火排烟，风随火动</p>
                                <p class="price2">2298元</p>
                            </a>
                        </div>
                        <div class="items-last">
                            <div>
                                <a href="#">
                                    <img src="../images/1612c93ad4756215774a0dbec7a81bb2.jpg" alt="">
                                    <h3 class="name2">米家电烤箱 </h3>
                                    <p class="price2">279元</p>
                                </a>
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                            <div>
                                <a href="#">
                                  浏览更多
                                </a>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
            <!-- 智能部分 -->
            <div class="smart">
                <div class="smart-nav">
                    <a href="#">
                    <img src="../images/59e8fc8ba9718c266882719fb4bbcedd.jpg" alt="">
                    </a>
                </div>
                <h2 class="title">智能 
                    <ul>
                        <li><a href="#">热门</a></li>
                        <li><a href="#">安防</a></li>
                        <li><a href="#">出行</a></li>
                    </ul>
                   
                </h2>
                <div class="smart-box">


                </div>

            </div>
        </div>
    </div>
</body> 
</html>

WEB前端全系列/第一阶段：HTML5+CSS3模块/CSS3新特性 19522楼

错误提示我没加符号，然后我加了个单引号，就跟视频里一样正常了这是为啥

JAVA 全系列/第一阶段：JAVA 快速入门/变量、数据类型、运算符 19523楼

请问老师这个问题怎么解决，我已经搞了好久了，还是弄不好

Python 全系列/第五阶段：数据库编程/项目-音乐播放器-旧 19524楼

老师，之前这版块不是到十三章“手写服务器”的吗？为什么没有了的？

JAVA 全系列/第二阶段：JAVA 基础深化和提高/Lambda表达式（旧） 19525楼

老师，height是rect方法自带的属性吗？那还有width？

Python 全系列/第二阶段：Python 深入与提高/游戏开发-坦克大战 19526楼

这个视频的软件目录在哪？

JAVA 全系列/第三阶段：数据库编程/MySQL数据库的使用 19527楼

老师您好：

streamlit 用不了怎么办安装错误如图

Python 全系列/第十五阶段：Python 爬虫开发/爬虫反反爬 19528楼

老师为什么我的项目创建成功后里面的app.vue 内容和视频一样，没有scrip这些，我也没有改动过呀，其他的文件都有

Python 全系列/第八阶段：Vue框架/vue框架 19529楼

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			.div_1{
				width:200px;
				height:200px;
				background-color: red;
				/*内边距 真是div到边界的距离*/
				/*padding: 50px;*/
				padding: 10px 20px 30px 40px;
			}
		</style>
	</head>
	<body>
		<div class="div_1"></div>
		
		
		
	</body>
</html>

老师我这个为什么不显示padding啊而且我定义的宽和高都是200x200 但是网页显示并不是啊

Python 全系列/第七阶段：网页编程基础/CSS 样式 19530楼

同学您好