var status=1;
var ob=$("[name='email']");
$.ajax({
url:"{:U('Home/Index/checkemail')}",
data:"email="+query.email,
type:"post",
dataType:"json",
success:function(re){
status=0;
}
});
alert(status);

$.ajax({
async:false,
url:"{:U('Home/Index/checkemail')}",
data:"email="+query.email,
type:"post",
dataType:"json",
success:function(re){
status=0;
}
});