Backend DevelopmentPHP TutorialA detailed explanation of tag languages other than PHP and their usesA detailed explanation of tag languages other than PHP and their uses
HTML and CSS
HTML and CSS are common tag languages in web development. HTML is used to define the structure of web pages, while CSS is used To control the style of web pages. Specifically, HTML uses various tags to represent different elements of a web page, such as titles, paragraphs, links, pictures, etc. CSS uses style rules to design the appearance of these elements, including color, font, size, layout, etc.
The following is a simple HTML and CSS example:
<!DOCTYPE html>
<html>
<head>
<title>示例网页</title>
<style>
body {
font-family: Arial, sans-serif;
background-color: #f0f0f0;
}
h1 {
color: blue;
}
p {
font-size: 16px;
}
</style>
</head>
<body>
<h1 id="欢迎访问示例网页">欢迎访问示例网页！</h1>
<p>这是一个演示用的网页，通过HTML和CSS进行设计。</p>
<img src="/static/imghwm/default1.png" data-src="example.jpg" class="lazy" alt="示例图片">
</body>
</html>In the above example, HTML defines content such as titles, paragraphs, and pictures, while CSS sets the style of the entire web page. Including background color, text color and font size, etc.
JavaScript
JavaScript is a powerful scripting language that can be used to add dynamic interactive effects to web pages. Through JavaScript, we can implement functions such as form validation, image carousels, responsive menus, etc. JavaScript can be embedded directly into HTML or introduced as an external file.
The following is a simple JavaScript example:
<!DOCTYPE html>
<html>
<head>
<title>JavaScript示例</title>
<script>
function greet(name) {
alert('你好，' + name + '！');
}
</script>
</head>
<body>
<button onclick="greet('小明')">点击我打招呼</button>
</body>
</html>In the above example, JavaScript defines a function greet(), which is used to pop up a prompt box to greet User greets. When the user clicks the button, this function will be called and a parameter will be passed in to achieve the interactive effect.
Python
Python is a general-purpose programming language that can also be used for web development. Through some frameworks such as Django, Flask, etc., we can use Python to build powerful web applications. Python's simplicity and readability make it one of the languages of choice for many developers.
The following is a Python example using the Flask framework:
from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello_world():
return '你好，世界！'
if __name__ == '__main__':
app.run()In the above example, we have created a simple web application using the Flask framework. When the user accesses the root path, Returns a 'Hello, world! ' News.
Summary
In addition to PHP, tag languages and programming languages such as HTML, CSS, JavaScript and Python also play an important role in Web development. They are used to define web page structure, style design, dynamic interaction and server-side logic respectively, and together they build a rich and colorful online world. I hope this article can provide some help in understanding these languages.
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