摘要：
substr($row['keyid'],0,3);截取前3个字符串substr("she is a well-read girl",0);从第0个字符开始截取substr("she is a well-read girl",4，14);从第4个字符开始连续截取14个字符substr("she is a well-read girl",-4，4);从倒数第4个字符开始截取4个字符substr("she is a well-read girl",0，-4);从第1个字符开始截取，截取到倒数第4个字符 阅读全文
摘要：
<script Language="JavaScript">function ChkFields() {if (document.myform.UserName.value=='') {window.alert ("请输入用户名！");myform.UserName.focus();return false}if (document.myform.UserName.value.Length<=2) {window.alert ("请用户名长度必须大于2！");myform.UserName.focus 阅读全文