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CS50 Week5 HTTP,HTML,CSS.md

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CS50 Week5 HTTP,HTML,CSS.md

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Week5 HTTP,HTML,CSS

  • 32 bit IP(internet protocol) address: IPv4
  • 80 = HTTP(HyperText Transfer Protocol); 25 = SMTP(Email)
  • URL(Uniform Resource Locater) is the address of a server. DNS(Domain Name System域名系统)coverts domain name to IP address and vise sersa.
  • HTTP/1.1 200 OK Content-type: Text/html

HTML

  • html means HyperText Markup Language 超文本标记语言
  • <b>boldface</b> bold <i>italics</i> italics <u>underline</u> underline
  • unordered list and ordered list:
<ul>
   <li>foo</li>
   <li>bar</li>
   <li>baz</li>
</ul>
<ol start=4>
    <li>4</li>
    <li>6</li>
<\ol>
<!DOCTYPE html>
<html lang ="en">
    <head>
        <title>
            hello, title
        </title>
    </head>
    <body>
       <strong>Hello</strong>body.
       <image alt = "phto" src = "dan.jpg">
       visit <a href = "https://www.harvard.edu/">Harvard</a>
    </body>
</html>

you can check the code: https://validator.w3.org/

CSS

  • CSS(Cascading Style Sheets层叠样式表)
body
{
    text-align: center;
    background-color: grey;
    color: #ffffff;
    font-family: Arial;
    opacity: 0.8;
}

header
{
    font-size: 20pt;
}

main
{
    font-size: medium;
}

footer
{
    font-size: small;
}

<link href="css.css" rel="sylesheets"> to introduce css in html

Javascript

let counter = 0;

function greet()
{
    alert("hello world");
}

let name = document.querySelector("#name").value; a variable called name stores the value of node that has a unique identifier of "name"