如何在鼠标单击时更改 php 变量

    var randomColorFactor = function() {
        return Math.round(Math.random() * 255);
    };
    var randomColor = function(opacity) {
        return 'rgba(' + randomColorFactor() + ',' + randomColorFactor() + ',' + randomColorFactor() + ',' + (opacity || '.3') + ')';
    };
    var config = '<div id='humidity'>'{
        type: 'line',
        data: {
            labels: <?php echo $json_array1; ?>,
            datasets: [{
                label: "",
                data: <?php echo $json_array; ?>,
            }]
        },
        options: {
            responsive: true,
            title:{
                display:true,
                text:'Chart'
            },
            tooltips: {
                mode: 'label',
                callbacks: {
                }
            },
            hover: {
                mode: 'dataset'
            },
            scales: {
                xAxes: [{
                    display: true,
                    scaleLabel: {
                        display: true,
                        labelString: 'Month'
                    }
                }],
                yAxes: [{
                    display: true,
                    scaleLabel: {
                        display: true,
                        labelString: 'Humidity'
                    },
                    ticks: {
                        suggestedMin: -10,
                        suggestedMax: 250,
                    }
                }]
            }
        }
    };
    $.each(config.data.datasets, function(i, dataset) {
        dataset.borderColor = randomColor(0.4);
        dataset.backgroundColor = randomColor(0.5);
        dataset.pointBorderColor = randomColor(0.7);
        dataset.pointBackgroundColor = randomColor(0.5);
        dataset.pointBorderWidth = 1;
    });
    window.onload = function() {
        var ctx = document.getElementById("canvas").getContext("2d");
        window.myLine = new Chart(ctx, config);
    };

在此代码中，我想在单击鼠标时将$json_array更改为其他数组$json_array2。我怎样才能实现它？$json_array包含从数据库提取的值。