在HTML中,form标签用于提交表单。form标签有一个enctype属性。
enctype 属性规定在发送到服务器之前应该如何对表单数据进行编码 也就是说,在Form元素的语法中,EncType表明提交数据的格式。
序号 | 值 | 描述 |
---|---|---|
1 | application/x-www-form-urlencoded |
(1)在发送前,编码所有字符(默认)。窗体数据被编码为“名称/值”对,这是标准的编码格式。 (2)当action为get时候,浏览器用x-www-form-urlencoded的编码方式把form数据转换成一个字串(name1=value1&name2=value2...),然后把这个字串append到url后面,用?分割,加载这个新的url。 (3)当action为post时候,浏览器把form数据封装到http body中,然后发送到server。 |
2 | multipart/form-data |
(1)不对字符编码。窗体数据被编码为一条消息,页上的每个控件对应消息中的一个部分。在使用包含【文件上传】控件的表单时,必须使用该值。 (2)如果没有type=file的控件,用默认的application/x-www-form-urlencoded就可以了。 但是如果有type=file的话,就要用到multipart/form-data了。浏览器会把整个表单以控件为单位分割,并为每个部分加上Content-Disposition(form-data或者file),Content-Type(默认为text/plain),name(控件name)等信息,并加上分割符(boundary)。 |
3 | text/plain | 空格转换为 "+" 加号,但不对特殊字符编码。 |

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