Jsp script, jsp declaration, jsp output expression, javascript, jsp tag, struts2 tag

Jsp script, jsp declaration, jsp output expression, javascript, jsp tag, struts2 tag
1. define the concept in the question first. (1) jsp script: in some cases, it is also called a java Script, which is a java Script on the jsp page that is enclosed by <%>. All code that can be executed in a java program can be executed through jsp scripts. (2) jsp Declaration: Use <%! Declaration Part %> variables and Methods declared in the form. It can be directly used in jsp scripts. (3) jsp output expression: Use <% = expression %> to output the expression value. The effect is the same as out. println In the jsp script. The expression cannot be followed by a semicolon. (4) javascript: code between <script> </script> on the page, js for short. Js inserts have different execution effects depending on different locations. It is executed only when it is put in the js call in