<input type=text name=text1>
<input type=button value=提交 onclick=woyingjie()>
<script>
function woyingjie(){
if(document.all.text1.value==""){
alert("不能为空");
return false;
}
if(document.all.text1.value.length>10){
alert("不能超过10");
return false;
}
if(document.all.text1.value.indexOf("买")>=0){
alert("不能有'买'字");
return false;
}
}
</script>
<input type=button value=提交 onclick=woyingjie()>
<script>
function woyingjie(){
if(document.all.text1.value==""){
alert("不能为空");
return false;
}
if(document.all.text1.value.length>10){
alert("不能超过10");
return false;
}
if(document.all.text1.value.indexOf("买")>=0){
alert("不能有'买'字");
return false;
}
}
</script>
<script>
function a(o)
{
if(o.value.length>10)
{
alert("err")
o.focus()
}
if(o.value.indexOf("求")>-1 || o.value.indexOf("买")>-1)
{
alert("求买")
o.focus()
}
}
</script>
var txt1;
</script><form name=form1 onsubmit="check();">
<input type=text name=t1 maxlength=10 onpropertychange="if (this.value.indexOf('求')!=-1 || this.value.indexOf('买')!=-1) this.value=txt1;else txt1=this.value;">
</form>
<script language=javascript>
var txt1='';
</script><form name=form1 onsubmit="check();">
<input type=text name=t1 maxlength=10 onpropertychange="if (this.value.indexOf('求')!=-1 || this.value.indexOf('买')!=-1) this.value=txt1;else txt1=this.value;">
</form>
<!--
function funcheck()
{
var strNote = document.all.T1.value;
var i;
if (strNote.length > 10) {alert("出界!"); return false;}
else
{
if (strNote.indexOf('求') != -1) {alert("不能含有'求'字"); return false;}
if (strNote.indexOf('买') != -1) {alert("不能含有'买'字"); return false;}
}
}
//-->
</script><input name=T1 size=20>
<input type=button value=check onclick="funcheck();">