tomcat启动startup.bat一闪而过

给setclasspath.bat的开头添加红色标记部分，以下：
rem ---------------------------------------------------------------------------
rem Set CLASSPATH and Java options
rem
rem $Id: setclasspath.bat 505241 2007-02-09 10:22:58Z jfclere $
rem ---------------------------------------------------------------------------

set JAVA_HOME=C:\Program Files\Java\jdk1.6.0_20
set JRE_HOME=C:\Program Files\Java\jre6