<script language="JavaScript">
var myarray = new Array("关键字1","关键字2","关键字3");
function check(theForm) {
 for (i=0;i<myarray.length;i++) {
 if (theForm.name.value.indexOf(myarray[i])!=-1)
 {alert("包含关键字");
 return false;}
 }
}
</script>

<form method="post" action="#">
 <input value="" type="text" name="name">
 <input type="submit" name="Submit" value="提交" onClick="return check(this.form)">
</form>