估计是高手不愿出手,就让偶这个低手来试试吧:)
<script>
function checkUserName(strUserName){
re=/(^ )|( $)/
return(!re.test(strUserName))//如果开始或结束位置是空格就不提交
}
</script>
<form action="" onsubmit=return(checkUserName(username.value))>
<input name=username>
<input type=submit>
</form>
<script>
function checkUserName(strUserName){
re=/(^ )|( $)/
return(!re.test(strUserName))//如果开始或结束位置是空格就不提交
}
</script>
<form action="" onsubmit=return(checkUserName(username.value))>
<input name=username>
<input type=submit>
</form>
<!--
function test(){
var s=t.value;
var n=s.length;
var ss=s.substring(0,1);
var sm=s.substring(n-1,n);
if(ss!==" "&&sm!==" "){alert("ok")}//符合条件时弹出OK
else alert("error")//否则弹出error
}
//-->
</SCRIPT>
<input type="text" id="t" value="$$$"><input type="button" value="测试" onclick="test()">