Explore the application of CSS and JavaScript in HTML

In recent years, with the rapid development of the Internet and the continuous advancement of technology, web design and front-end development have become a hot spot of concern. As two important languages ​​​​for web design and front-end development, CSS and JavaScript are crucial to web production. This article will use NetEase as a case study to explore the application of CSS and JavaScript in HTML and how they can work together to build a beautiful website.

NetEase is the most well-known Internet company in China and one of the earliest Internet portals. The aesthetics and functional integrity of its website have a very high reputation in the industry. Among them, CSS and JavaScript play a key role in the NetEase website. The following will take the NetEase news page as an example to analyze the application of these technologies in web design one by one.

1. CSS

CSS (Cascading Style Sheets) is a language used to describe styles on web pages. These styles include fonts, backgrounds, borders, typography, etc. . In web design, CSS can make web pages have good visual effects, reasonable layout and good user experience.

In NetEase news layout, CSS is widely used. For example, the title, body text, footer, etc. are all decorated and typeset using CSS. In fact, every piece of text, every picture, and every link in this content can present a different style. This is the power of CSS. As shown below:

.news-title{
  font-size: 24px;
  font-weight: 700;
  line-height: 32px;
  color: #333333;
  margin-top: 16px;
  margin-bottom: 24px;
}

.news-content{
  font-size: 14px;
  line-height: 24px;
  color: #666666;
  margin-bottom: 32px;
}

.news-image{
  max-width: 100%;
  margin: 0 auto;
  display: block;
}

.news-link{
  color: #0079FF;
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 8px;
}

Through the setting of CSS code, we can clearly see the font size, boldness, line height, color, etc. of the title, as well as the font size, line height, color, and link of the news content The font color, bolding and underlining, etc., can greatly improve the user's reading experience and sense of use.

In addition, CSS also plays a very important role in web page layout, as shown below:

.container{
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 16px;
  padding-right: 16px;
}

.news-wrapper{
  display: flex;
  flex-wrap: wrap;
}

.news-list{
  width: calc(33.33333% - 16px);
  margin-right: 16px;
  margin-bottom: 32px;
  box-sizing: border-box;
  overflow: hidden;
}

The above code shows the CSS layout of elements such as containers and news lists. Among them, .container sets the maximum width and automatic left and right alignment, .news-wrapper sets the typesetting method, and .news-list sets the width, right margin, and bottom margin. The settings of these CSS codes are the basis for web page layout and presentation. They ensure that the layout of the web page is stable and beautiful.

2. JavaScript

JavaScript is a scripting language that can bring interactivity, dynamics and multimedia effects to web pages. It is often used to create interactive user interfaces, dynamically update web content, and control multimedia playback. In NetEase news layout, JavaScript also plays a very important role.

For example, the "Headline News" position in NetEase News is very important, and the news content needs to be automatically updated every once in a while. At this time, JavaScript is needed to implement it. The following is a simplified code:

function getTopNews(){
  //处理数据
  var data = [
    {title: "新闻标题", url: "http://news.163.com/xxx", img: "http://image.163.com/xxx.jpg"},
    ...
  ];

  //呈现效果
  var html = "";
  for(var i=0; i<data.length; i++){
    var item = data[i];
    html += &#39;<a href="&#39; + item.url + &#39;">';
    html += '<img src="&#39; + item.img + &#39;">';
    html += '<span class="headline">' + item.title + '</span>';
    html += '</a>';
  }
  $("#top-news").html(html);
}

setInterval(getTopNews, 3000);

The above code implements regular updates of headlines by calling the setInterval function. First, JavaScript fetches data over the network, and then uses HTML code to render the data onto a web page. In this process, JavaScript and CSS are intertwined to build a dynamic, interactive, and beautiful website.

In addition, JavaScript can also add some interactive effects such as mouse hover, click, and animation effects to the website. Careful readers may notice that when the mouse is hovering over a news image, some special effects appear around the image. This is also the result of JavaScript. The following is a simplified code:

$(".news-image").hover(function(){
  //鼠标进入事件
  $(this).css("opacity", ".8");
},function(){
  //鼠标离开事件
  $(this).css("opacity", "1");
});

The above code adds mouse entry and exit events to news pictures by matching class names. When the mouse is hovered over a news image, the transparency changes. This simple animation effect can add a lot of interactivity and visual effects to the website.

To sum up, CSS and JavaScript are important languages ​​in web design and front-end development, and their role in website production is self-evident. They not only make the website more beautiful and readable, but also give it interactivity, dynamics and multimedia effects. In NetEase News, CSS and JavaScript are perfectly combined to build an excellent website, providing a large amount of valuable news information to the majority of netizens.

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