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Web开发基础

成都创新互联公司于2013年开始,是专业互联网技术服务公司,拥有项目成都网站设计、成都网站建设网站策划,项目实施与项目整合能力。我们以让每一个梦想脱颖而出为使命,1280元漯河做网站,已为上家服务,为漯河各地企业和个人服务,联系电话:13518219792

I. 网页基础

A. HTML

1、结构标签

: 定义整个HTML文档

: 包含文档的元数据,如标题和链接

: 包含可见的页面内容

</code>: 定义浏览器工具栏的标题</p><p><code><meta></code>: 提供元数据信息,如字符编码</p><p>2、格式标签</p><p><code><h1></code>到<code><h6></code>: 定义不同级别的标题</p><p><code><p></code>: 定义段落</p><p><code><div></code>: 定义一个块级元素,用于布局</p><p><code><span></code>: 定义内联元素,用于样式化文本</p><p>3、链接与图片</p><p><code><a></code>: 定义超链接,用于页面跳转</p><p><code><img></code>: 插入图像,需要指定src属性</p><p><code><map></code>: 定义图像映射,用于点击图像的不同区域</p><p>B. CSS</p><p>1、选择器</p><p>元素选择器: 通过HTML元素的标签名来选择元素</p><p>类选择器: 以<code>.</code>开头,用于选择具有特定类的元素</p><p>ID选择器: 以<code>#</code>开头,用于选择具有特定ID的元素</p><p>2、盒模型</p><p>内容(content): 实际内容所在区域</p><p>填充(padding): 内容和边框之间的空间</p><p>边框(border): 环绕在填充和外边距之间的线</p><p>外边距(margin): 元素周围的空间</p><p>3、布局方式</p><p>静态定位(static): 默认布局方式,元素按照正常的文档流进行排列</p><p>相对定位(relative): 元素相对于其正常位置进行偏移</p><p>绝对定位(absolute): 元素相对于最近的已定位祖先元素进行定位</p><p>固定定位(fixed): 元素相对于浏览器窗口进行定位</p><p>浮动定位(float): 元素脱离正常文档流并向左或向右移动</p><p>弹性盒子布局(flexbox): 提供更加有效的布局、对齐和空间分配方式</p><p>网格布局(grid): 二维布局系统,用于创建复杂的设计布局</p><p>C. JavaScript</p><p>1、变量与数据类型</p><p>基本数据类型: string, number, boolean, null, undefined</p><p>对象: 由键值对组成,可存储更复杂的数据结构</p><p>2、函数</p><p>定义函数: 使用<code>function</code>关键字声明</p><p>调用函数: 使用函数名后跟括号的方式执行</p><p>匿名函数: 没有具体名称的函数,通常用于事件处理或回调</p><p>3、事件处理</p><p>事件监听: 使用<code>addEventListener</code>方法监听特定事件</p><p>事件传播: 事件从触发元素向上冒泡至根节点的过程</p><p>事件捕获: 事件从根节点向下传递至目标元素的过程</p><p>II. Web安全</p><p>A. 跨站脚本攻击 (XSS)</p><p>描述: XSS是一种常见的攻击方式,攻击者通过在网页中注入恶意脚本,当其他用户浏览该网页时,这些脚本会在用户的浏览器上执行。</p><p>防护措施: 对用户输入进行验证和清理,使用内容安全策略(CSP)限制资源的加载,以及使用HTTP头部的<code>XContentTypeOptions</code>和<code>XXSSProtection</code>来防止攻击。</p><p>B. SQL注入</p><p>描述: SQL注入是攻击者通过在应用程序的查询字符串中插入恶意SQL代码,以此来操控数据库,获取、篡改或删除数据。</p><p>防护措施: 使用预编译语句和参数化查询,限制数据库的使用权限,以及实施严格的输入验证。</p><p>C. HTTPS与SSL/TLS</p><p>描述: HTTPS是在HTTP协议上增加SSL/TLS加密的安全协议,它为数据传输提供了加密保护,确保数据在传输过程中的安全性。</p><p>应用: 网站应当使用HTTPS来保护用户数据的隐私和完整性,特别是在处理敏感信息如登录凭据、支付信息等时。</p><p>D. 认证与授权机制</p><p>描述: 认证是确认用户身份的过程,而授权是授予用户访问资源的能力,这两者是网络安全的关键组成部分。</p><p>实践案例: 使用OAuth、OpenID Connect等开放标准进行认证,以及使用JSON Web Tokens (JWT)来管理用户的会话和授权信息,Google和Facebook的API就广泛使用了OAuth 2.0来进行用户认证。</p><p>III. Web性能优化</p><p>A. 网络请求优化</p><p>减少HTTP请求: 合并CSS和JavaScript文件,使用图片精灵和图标字体来减少请求次数。</p><p>使用CDN: 利用地理分布式的内容分发网络(CDN)来加速静态资源的加载速度。</p><p>压缩资源: 启用服务器端的GZIP或Brotli压缩来减小传输文件的大小。</p><p>B. 资源加载策略</p><p>异步加载: 使用<code>async</code>和<code>defer</code>属性来控制脚本的加载和执行时机。</p><p>按需加载: 实现代码拆分,只在需要时加载特定的模块或组件。</p><p>预加载: 使用<code><link rel="preload"></code>来提前加载关键资源,加快页面渲染速度。</p><p>C. 缓存策略</p><p>HTTP缓存: 设置合适的<code>CacheControl</code>和<code>Expires</code>头部来指示浏览器缓存静态资源。</p><p>Service Workers: 使用Service Workers来控制页面和静态资源的缓存,即使在离线状态下也能提供服务。</p><p>应用案例: Amazon的电子商务平台通过优化图片大小和格式,以及实施智能的缓存策略,显著提高了页面加载速度和用户体验。</p> <br> 本文名称:web <br> 文章网址:<a href="http://www.jxjierui.cn/article/ccoccgp.html">http://www.jxjierui.cn/article/ccoccgp.html</a> </div> <div class="hot_new"> <div class="page_title clearfix"> <h3>其他资讯</h3> </div> <div class="news_list clearfix"> <ul> <li> <a href="/article/dpgjgio.html">c语言10的-5次方怎么写</a> </li><li> <a href="/article/dpgjgep.html">cn域名不备案能解析吗?cn域名香港服务器备案吗</a> </li><li> <a 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<p>公司名称:青羊区浩晨众云设计工作室(个体工商户) 联系电话:18980820575</p> <p><a href="http://beian.miit.gov.cn" target="_blank" rel="nofollow">网站备案号:蜀ICP备2025119795号-2</a></p> <p>内江浩晨众云建站 内江网站建设 内江网站设计 内江网站制作 <a href="http://www.cdxwcx.cn/" target="_blank">成都做网站</a></p> </div> </div> </div> </div> </body> </html> <script> $(".technical_support_box_z_info_box img").each(function(){ var src = $(this).attr("src"); //获取图片地址 var str=new RegExp("http"); var result=str.test(src); if(result==false){ var url = "https://www.cdcxhl.com"+src; //绝对路径 $(this).attr("src",url); } }); window.onload=function(){ document.oncontextmenu=function(){ return false; } } </script><div id="think_page_trace" style="position: fixed;bottom:0;right:0;font-size:14px;width:100%;z-index: 999999;color: #000;text-align:left;font-family:'微软雅黑';"> <div id="think_page_trace_tab" style="display: none;background:white;margin:0;height: 250px;"> <div id="think_page_trace_tab_tit" style="height:30px;padding: 6px 12px 0;border-bottom:1px solid #ececec;border-top:1px solid #ececec;font-size:16px"> <span style="color:#000;padding-right:12px;height:30px;line-height: 30px;display:inline-block;margin-right:3px;cursor: pointer;font-weight:700">基本</span> <span style="color:#000;padding-right:12px;height:30px;line-height: 30px;display:inline-block;margin-right:3px;cursor: pointer;font-weight:700">文件</span> <span style="color:#000;padding-right:12px;height:30px;line-height: 30px;display:inline-block;margin-right:3px;cursor: pointer;font-weight:700">流程</span> <span style="color:#000;padding-right:12px;height:30px;line-height: 30px;display:inline-block;margin-right:3px;cursor: pointer;font-weight:700">错误</span> <span style="color:#000;padding-right:12px;height:30px;line-height: 30px;display:inline-block;margin-right:3px;cursor: pointer;font-weight:700">SQL</span> <span style="color:#000;padding-right:12px;height:30px;line-height: 30px;display:inline-block;margin-right:3px;cursor: pointer;font-weight:700">调试</span> </div> <div id="think_page_trace_tab_cont" style="overflow:auto;height:212px;padding: 0; line-height: 24px"> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">请求信息 : 2026-02-22 04:17:27 HTTP/1.1 GET : /article/ccoccgp.html</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">运行时间 : 0.0623s ( Load:0.0032s Init:0.0005s Exec:0.0542s Template:0.0043s )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">吞吐率 : 16.05req/s</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">内存开销 : 2,222.52 kb</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">查询信息 : 12 queries 5 writes </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">文件加载 : 36</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">缓存信息 : 0 gets 2 writes </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">配置加载 : 130</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">会话信息 : SESSION_ID=vhemvs3t4472s24d3kg5h6is56</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/index.php ( 1.12 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/ThinkPHP.php ( 4.61 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Think.class.php ( 12.26 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Storage.class.php ( 1.37 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Storage/Driver/File.class.php ( 3.52 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Mode/common.php ( 2.82 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Common/functions.php ( 53.56 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Hook.class.php ( 4.01 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/App.class.php ( 13.49 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Dispatcher.class.php ( 14.79 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Route.class.php ( 13.36 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Controller.class.php ( 11.23 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/View.class.php ( 7.59 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/BuildLiteBehavior.class.php ( 3.68 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ParseTemplateBehavior.class.php ( 3.88 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ContentReplaceBehavior.class.php ( 1.91 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Conf/convention.php ( 11.15 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/App/Common/Conf/config.php ( 2.12 KB )</li><li style="border-bottom:1px solid 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KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Model.class.php ( 60.11 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php ( 32.43 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db/Driver/Pdo.class.php ( 16.74 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache.class.php ( 3.83 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php ( 5.87 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Template.class.php ( 28.16 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Template/TagLib/Cx.class.php ( 22.40 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Template/TagLib.class.php ( 9.16 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/App/Runtime/Cache/Home/7540f392f42b28b481b30614275e4e55.php ( 13.96 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/WriteHtmlCacheBehavior.class.php ( 0.97 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ShowPageTraceBehavior.class.php ( 5.24 KB )</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_init ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\BuildLiteBehavior [ RunTime:0.000004s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_init ] --END-- [ RunTime:0.000023s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000146s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --END-- [ RunTime:0.000161s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ContentReplaceBehavior [ RunTime:0.000050s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --END-- [ RunTime:0.000079s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ParseTemplateBehavior [ RunTime:0.003443s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --END-- [ RunTime:0.003458s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000065s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --END-- [ RunTime:0.000074s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_end ] --START--</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= ) </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: pid /home/wwwroot/jxjierui.cn/App/Home/Controller/ArticleController.class.php 第 47 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] file_put_contents(./App/Runtime/Temp/3fdc4bebd30a0e73d1d8e13b4821b594.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_host /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 120 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_port /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 121 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_name /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 122 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] file_put_contents(./App/Runtime/Temp/92bbc647aff8040fa7ea5606df27006b.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> </ol> </div> </div> </div> <div id="think_page_trace_close" style="display:none;text-align:right;height:15px;position:absolute;top:10px;right:12px;cursor: pointer;"><img style="vertical-align:top;" 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3ukcXd5s7LvLD3me61WkuTCpJzYAyRurMB44EdEJzTfU271lUJC03YjXJXzYOGZwN4D8eB5jlfLrdWfzGRW7icMPfiSO6Oe7s20bmhdgLX4Z23B+s3JgQESzUDiMboSzDMHFpNMwccGePauhfwjzwnI2wu9zKGgEFg80jcZ7MHllk07s1H+5yojtUQTlH4nFdLKTGwDmPbIklOb1L1zO4T6N8NCuDLFLS/C63c0eNRimZ++s5BMBHxU11jHchI9oFVUxRh/eMDzHEzGYu0Lg8gJ7oS/tFCwoic44fyUtix0n/46vP4bf+//BRgAYwDDar4ncHIAAAAASUVORK5CYII="></div> 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