${name}是${param.name}的简写还是${requestScope.name}的简写
${name}是${param.name}的简写还是${requestScope.name}的简写
------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