laravel：将对象传递给d3.cal-heatmap

I want to build a data variable containing the number of occurrences of unix datetime values.

i.e.

{1489140000.0: 2, 1487239200.0: 1, 1483524000.0: 2, 1486634400.0: 1, 1490086800.0: 3 }

My error is that on the view I'm getting laravel use of undefined constant datas - assumed 'datas'

public function showStatistics()
{
    $job_post_date = Emploi::where('language', 'EN')->pluck('POSTDATE');
    $unix_time = array();

    for ($i=0; $i < count($job_post_date) ; $i++) { 
        $unix_time[$i] = strtotime($job_post_date[$i]);
    }

    $datas = array_count_values($unix_time);
    $datas = json_encode($datas);

    return view('emploi.stats', ['datas' => $datas]);
}

excerpt of a javascript part in the stats.blade.php

....
var cal = new CalHeatMap();
cal.init({
    itemSelector: "#example-d",
    domain: "month",
  itemName: ["job", "jobs"],
    data:  {!! datas !!},
    start: thisMonth.SubtractMonth(5),
    cellSize: 12,
    cellPadding: 5,
    ....

I'm getting an error in the template on: {{ datas }}

Use

data:  {!! $datas !!}

instead of

data:  {!! datas !!}

You missed the dollar sign, which makes PHP assume it's a constant (which you don't declare).