die(json_encode(.没有返回

$.post('{:U("Safeinfo/txpassadd")}', $("#txadd").serialize(), function(data) {
 alert("ok");	...

tip("100", '交易密码不能与登录密码一样！');

function tip($code, $msg) {
    $arr['code'] = iconv('GB2312', 'UTF-8', $code);
    $arr['msg'] = iconv('GB2312', 'UTF-8', $msg);
	
    //die(json_encode($arr));
    die(var_json_encode($arr));  //cjq
}

function var_json_encode($var){ 
 $_var = var_urlencode($var); 
 $_str = json_encode($_var); 
 return urldecode($_str); 
}

function tip($code, $msg) {
    $arr['code'] = iconv('GB2312', 'UTF-8', $code);
    $arr['msg'] = iconv('GB2312', 'UTF-8', $msg);
	
    die(json_encode($arr,JSON_UNESCAPED_UNICODE));  //cjq
}

function tip($code, $msg) {
    $arr['code'] = iconv('GB2312', 'UTF-8', $code);
    $arr['msg'] = iconv('GB2312', 'UTF-8', $msg);
     
    die(json_encode($arr));
//    die(var_json_encode($arr));  //cjq
}

function tip($code, $msg) {
    $arr['code'] = iconv('GB2312', 'UTF-8', $code);
    $arr['msg'] = iconv('GB2312', 'UTF-8', $msg);
     
//    die(json_encode($arr));
    die(var_json_encode($arr));  //cjq
}