显示数据表的数组数据时出现问题

Question

我在数据表中显示数据时遇到问题，如果我将数组直接放入其中就可以了

$id = $request->id;

$find = Presal::find($id);
$find->user_id = $request->customer_id;
$find->proposalid = $request->proposalid;
$psal = $find->save();

if ($psal) {
    foreach ($request->service_item_id as $key => $n) {
        $find->proposalService()->updateOrCreate([
            'service_item_id' => $request->service_item_id[$key],
            'start_date'      => $request->start_date[$key],
            'end_date'        => $request->end_date[$key],
            'service_type_id' => $request->service_type_id[$key],
            'vendor_submit'   => $request->vendor_submit[$key],
        ]);
    }
}

但当我使用变量时，它不是它说的读取错误docs https://datatables.net/manual/tech-notes/4 我不明白这里发生了什么

$.parseJSON("[[\"1\",\"New Zealand\",\"20\"],[\"2\",\"Australia\",\"30\"]]");