关于javascript:HTML-链接和图片

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广大无际的互联网世界！

a 标签

应用 a 标签就能够生成一个链接元素：

一起帮

a 标签自身并不难，难的是它应用的属性：

title

当鼠标悬停在 a 标签上时，浏览器会显示 title 指定的内容，给用户提醒_（对 SEO 也有帮忙）_

title 还能够利用在其余很多标签中，比方接下来要学习的 img……

target

批示如何关上 a 标签批示的网页：

  • _self：默认，在以后网页关上
  • _blank：在新的 tab 中关上

href

href 指定点击 a 标签应关上的网页地址。网址能够能够通过以下形式示意：

1）网址，即 URL，如：http://17bang.ren/Article/624。_（温习：网址的机密）_

这通常只用于指向（本）站（以）外的网页。

因为它蕴含了协定（http）和域名（17bang.ren），不够灵便。比方，咱们还在开发阶段，域名基本没有确定（用 localhost 代替），这时候该应用什么域名呢？难道咱们开发时应用 localhost，部署时再把 localhost 全副替换成 17bang.ren 吗？假如某一天咱们网站的域名又更换了呢？^_^

2）门路（Path），URL 中不蕴含协定和域名局部，比方：/Article/624。门路又能够分成两种：

  • 相对（Absolute）门路：它总是以斜杠（/）结尾，用斜杠代表根目录_（即以后我的项目的 wwwroot 文件夹）_，从根目录开始定位。飞哥 强烈 倡议 总是应用这种形式！

  • 绝对（Relative）门路：绝对于以后页面所在目录进行定位（仅供面试应用，不 举荐这种形式），

    ./

    以后文件所在文件夹

    可省略

    ../

    以后文件所在文件夹的上一级

    ../../

    以后文件所在文件夹的上一级的再上一级

    假如以后页面门路为：/Article/yezi/A624

    1. href=”A236″：定位到以后文件夹下的 236 页面，即：/Article/yezi/A236
    2. Category-1/Index：定位到以后文件夹下的 Category- 1 文件夹下的 Index 页面，即：/Article/yezi/Category-1/Index
    3. href=”../Index”：定位到以后文件夹的上一级文件夹下的 Index 页面，即：/Article/Index
    4. href=”../../Problem”：定位到以后文件夹的上一级的再上一级文件夹下的 Problem 页面，即：/Problem

此外，网上还有另外一种基于 URL 的分类办法（称呼），对照表如下：

本文应用

其余分类

网址

相对 url

门路

绝对 URL

绝对路径

绝对根 URL

相对路径

绝对以后 URL

其余文件和 download

href 前面还能够指定非 html 的文件。

  • 如果指定的文件可能在浏览器中关上，默认主动关上，比方.txt；

    readme

  • 否则提醒下载，比方.dll 文件

    system

如果要浏览器可关上文件被下载，须要增加一个 download 属性：

readme

留神：基于平安思考，一些可执行文件（如.exe、.dll）会被禁止拜访 / 下载。

锚标记

在 href 指定的 URL 中能够增加井号“#”，比方：

email email

当点击这种链接时，浏览器会主动定位到 #后指定的“锚”地位。锚地位也是 a 标签，用 id 或 name 匹配：

email email

一起帮的 FAQ 中大量应用了锚标记。_（演示）_

HTML5 新用法

依据新的 HTML5 规范，href 中还能够放 email 地址、电话号码等

给飞哥一封 Email:2282636022@qq.com 给飞哥来个电话：18623051469

因为这种写法 须要浏览器反对，所以最好将 Email 地址和电话号码都体现进去，免得浏览器不反对时，用户无奈看到他们。

img 标签

可用于显示图片：

<img src=”/images/ 源栈广告.png” alt=” 源栈广告 ” title=” 大神小班，ASP.NET 全栈培训 ” />

图片的格局抉择：（温习：图片格式）

  • jpg/jpge：位图，可有损压缩
  • png：位图，无损压缩，可通明背景
  • gif：像素较低，可制作动图

属性

  • src：图片门路（起源：source）
  • alt：当图片无奈获取时的代替（alter）文字
  • title：同 a 标签，鼠标悬浮时显示

图片的要害是性能：压缩（个别是美工 /UI 去做）

作业

  1. 模仿常见问题页面，实现其内容页局部（只显示内容，练习：hX/a/hr，疏忽其余如图标 / 款式等）
  2. 参考如何取得帮帮点，实现外面的表格。而后将“注册”和“邀请注册”高低两格合并。（练习：表格绘制和行列合并）
  3. 浏览收看：源栈培训：性能索引 http://17bang.ren/Article/589

  4. 实现任一内容（求助 / 文章 / 意见建议）板块的列表页和单页的 HTML 内容，留神蕴含：

    1. 残缺的 html 文档构造（html/head/body）
    2. 页头 / 页脚 / 注释 / 侧边栏等（header/footer/article/aside）
    3. 题目 / 段落 / 图片 / 链接 / 强调 / 删除……等

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javascript
发表至： javascript
2020-12-27
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