减小字体 增大字体
] 源码如下<br>----------------------------------------------------------<br><html><br><head><br><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><br><title>html－www.51<a target="_blank" href="http://www.newasp.cn/" class="wordstyle">windows</a>.Net</title><br></head><br><body><br><SCRIPT LANGUAGE="JavaScript"><br><!--<br>function check()<br>{<br> if(document.register.email.value.length!=0)<br> {<br> if (document.register.email.value.charAt(0)=="." || <br> document.register.email.value.charAt(0)=="@"|| <br> document.register.email.value.indexOf('@', 0) == -1 || <br> document.register.email.value.indexOf('.', 0) == -1 || <br> document.register.email.value.lastIndexOf("@")==document.register.email.value.length-1 || <br> document.register.email.value.lastIndexOf(".")==document.register.email.value.length-1)<br> {<br> alert("Email的格式不正確！");<br> document.register.email.focus();<br> return false;<br> }<br> }<br> else<br> {<br> alert("Email的不能为空！");<br> document.register.email.focus();<br> return false;<br> }<br> return false;<br>} <br>//--><br></SCRIPT><br><form name="register" method="POST" action onSubmit="return check();"><br><p align="center"><br> Email:<input type="text" name="email" size="20"><br> <input type="submit" value="提交" name="B1"><br> <input type="reset" value="重填" name="B2"><br></p><br></form> <br></body><br></html> <br>
[提示：你可先按照下面代码提示修改 上面部分代码，再按运行，此处看到的演示不完全正确]
减小字体
增大字体
