在smarty chartjs中显示json格式的数据

<script src="path/to/chart.js"></script>

<canvas id="myChart"></canvas>

{assign var="jsonData" value='{"labels": ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"], "datasets": [{"label": "My Dataset", "data": [12, 19, 3, 5, 2, 3]}]}'}
{assign var="data" value=$jsonData|json_decode:true}

<script>
var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
    type: 'bar',
    data: {
        labels: {$data.labels|json_encode},
        datasets: [{
            label: {$data.datasets.0.label|json_encode},
            data: {$data.datasets.0.data|json_encode},
            backgroundColor: 'rgba(75, 192, 192, 0.2)',
            borderColor: 'rgba(75, 192, 192, 1)',
            borderWidth: 1
        }]
    },
    options: {
        scales: {
            y: {
                beginAtZero: true
            }
        }
    }
});
</script>