2016-01-27

Record it:

1, NodeType

The NodeType property returns the type of the node. The most important node types are: element type node type

Elemental Element 1

? attribute attr 2

? Text 3

? Note Comments 8

Document 9

2.the difference between px, EM and rem in CSS

PX: Relative to resolution

EM: relative to Parent

REM: relative to HTML elements

3. the difference between post and get

1. Get is the data that is fetched from the server and post is the data sent to the server. 
2. Get is the URL where the parameter data queue is added to the Action property of the submission form, and the value corresponds to the field one by one in the form, which is visible in the URL. Post is the HTTP post mechanism that places the fields within the form with their contents in the HTML header, along with the URL address referred to by the Action property. The user does not see the process. 
3. For Get mode, the server side uses Request.QueryString to get the value of the variable, and for post, the server side uses Request.Form to obtain the submitted data. 
4. Get transmits a small amount of data, cannot be greater than 2KB. Post transmits a large amount of data, which is generally not restricted by default. In theory, however, the maximum amount of IIS4 is 100KB in 80KB,IIS5. 
5. Get security is very low, post security is high. But the execution efficiency is better than the Post method. 

Recommendation:
1, get the security of the method is less than the post, including confidential information, it is recommended to use the Post data submission method;
2, when doing data query, it is recommended to use Get method, and in the data to add, modify or delete, the proposed post method;

2016-01-27