${name}是${param.name}的简写还是${requestScope.name}的简写
JSP
------解决方案--------------------
${name} 会查找从小到大(pageContext,servletRequest,httpSession,servletContext)作用域中的attribute
------解决方案--------------------
#1楼说的,EL表达式中会在属性范围内找,从小到大,找到即可返回,一直找不到返回null
Page PageScope
Request RequestScope
Session SessionScope
Application ApplicationScope