代碼在這里：

頁面一、 勾選商品選項

為防止刷新頁面引起的時間戳和隨機數的變動，所以這倆var需要在前一個頁面設置好
var rand_str = Math.random();
rand_str = rand_str*2000;
rand_str = Math.ceil(rand_str);
var time = Date.parse(new Date());
time = time /1000 ;

帶上選好的參數調到支付頁面，上邊有調用微信公眾號支付的按鈕
location.href = 'makeorder/coinrecharge2?data_re='+data_re+'&data_co='+data_co+'&id='+id+'&rand_str='+rand_str+'&time='+time+'';

頁面二、 接收上個頁面傳來的參數，用laravel的對象，不用數組，數組遇到空白會報錯。
設置訂單生成時間：$createtime = time();

$row = [
'user_id' => $id ,
'out_trade_no' => $out_trade_no ,
'data_re' => $data_re ,
'data_co' => $data_co ,
'pay_status' => 0,
'createtime' => $createtime
];

    session_start();
    if($row['user_id']){
        $json = json_encode($row);
        $_SESSION['json'] = $json;
        $_SESSION['out_trade_no'] = $row['out_trade_no'];
    }

如果是form表單提交：

        <input type="hidden" name="rand_str" id="rand_str">
        <input type="hidden" name="time" id="time">
        <script src='https://code.jquery.com/jquery-3.2.1.min.js'></script>
        <script type="text/javascript">
            var rand_str = Math.random();
            rand_str = rand_str*2000;
            rand_str = Math.ceil(rand_str);

            var time = Date.parse(new Date());
            time = time /1000 ;

            $("#rand_str").val(rand_str);
            $("#time").val(time);

        </script>