<script>
function editdatapost(){
var ex;
var formData=$("#upcomfromeditdata").serialize();
$.ajax({
type: "POST",
url: "commond.php?cmd=upcomfromeditdata",
processData:true,
data:formData,
async:false,
success: function(data){
if(data==-2){
ex=-2;
}else{
ex=0;
}
}
});
if(ex==-2){
alert("用户名已存在");
return false;
}
}
</script>