CSS Margin (margin) property defines the space around the element. Marginmargin clears the area around the element (the outer border). Margin has no background color and is completely transparent. Margin can change the top, bottom, left and right margins of the element independently. It is also possible to change all properties at once. Margin can use negative values and overlapping content.
1. Introduce how to use CSS margins
Introduction: CSSMargin (margin) The CSSMargin (margin) property defines the space around an element. Marginmargin clears the area around the element (the outer border). The margin has no background color and is completely transparent. The margin can be changed individually...
2. Analysis of the problem of uploading images with MySQL+SSM+Ajax (picture)
Introduction: This article mainly introduces the problem of MySQL+SSM+Ajax uploading pictures. Has very good reference value. Let’s take a look with the editor below
3. xml learning (1) Several file formats of xml
Introduction: Using SSM (spring, SpringMVC and Mybatis) 1. Let’s briefly introduce XML. XML is a text-based markup language, similar to html , can easily store data
4. Java Advanced Tutorial: Event Processing
Introduction: The Applet class inherits many event handling methods from the Container class. The Container class defines several methods, such as processKeyEvent() and processMouseEvent(), to handle special types of events. There is also a method that captures all events called processEvent.
5. python descriptor descriptor(2)
##Introduction: python's built-in descriptors python has some built-in descriptor objects, PRoperty, staticmethod, classmethod, python is implemented as follows:
6. ssm framework mysql acquisition Value, some fields have empty values, others have values but the database has values
Introduction: In There are values in the database, and they are all found when using the mysql tool. However, when using ssm to check, two fields have no values, but other fields can be found. Those two fields have values in the database! [Picture description](http://img.ask.csdn.net/upload/201612/05/1480902922_39050.png) 
7. How to delete migrate migration files in Laravel through commands
Introduction: When creating migrate, pass the command {code...} and then add the directory of the migration file to the two files autoload_static.php and autoload_classmap.php. Now every time I need to delete the migrate file of the above test table, in addition to deleting the migrate file itself...
8. python function-classmethod()
Introduction: python function - classmethod()
9. php namespace (namespace) usage and description
Introduction:: This article mainly introduces the usage and instructions of PHP namespace. Students who are interested in PHP tutorials can refer to it.
Introduction :instanceof: operator: Kernel implementation of instanceof: (All codes involved in this article are: php-7.0.4 version) There is a type operator instanceof in PHP, which is used to determine whether a PHP variable belongs to a certain class. Quote from the official document Example in:
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