自己动手-表单2
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>无标题文档</title><script type="text/javascript">window.onload=function(){var btnTest=document.getElementById("btnTest");btnTest.onclick=function(e){var username=document.getElementById("username");if(username.value=="macrotea"){var loginForm=document.getElementById("loginForm");loginForm.submit();}else{//方式1：/*if(e){e.preventDefault();//标准方式}else{event.returnValue=false;//IE方式}*///方式2：return false;}}}</script><style type="text/csss"></style></head><body> <form id="loginForm" name="loginForm" method="post" action="http://macrotea.iteye.com"> <p>用户名: <br /> <input name="username" type="text" id="username" value="macrotea1" /> <br /> <input type="button" name="btnTest" id="btnTest" value="测试"/> </p> </form></body></html> ?