编码，encoding，content-type，charset都有哪些区别？他们的优先级呢？

1. Web Text Encoding
元则

2. Decode Transfer Encode
text
browser Web Server
editor
Content-Type: charset=
save as ...
Default charset
html
<meta charset=””

3. 名词
• content-type
• charset
• encoding
• escape

4. Html
• http头部的content-type > html meta 标签
> 链接到外部资源标签的charset属性
• 显示字符：原字符字符, char reference,
html entity (€ &#8364; &euro;)

5. url, form
• url: ASCII only, Percent encoding
• form submit
• ajax submit

6. Javascript
• String.fromCharCode: 通过unicode数值得
到对应字符
• charCodeAt：得到字符unicode数值
• escape, encodeURI, encodeURIComponent

7. alipay
• page, uisvr gbk, why gbk?
• js css utf-8
• ajax utf-8
• sofa
• login goto

8. • 浏览器在地址栏输入中
文参数
• 调试工具