how to read django data in javascript from Built-in template tags

[Nazib Ahmad]

in my program  javascript dont read the data which is got from django but 
the same page html tag the the data.

here is my code
 <script>




       
        var bubbleChartData = {

            datasets: [ {
                label: "Graph of Attacks",
                  backgroundColor:"#FF6384",

            data: '{{ b }}',....................................problam in 
this line this data cant read.this data sample [{ 'r':15, 'x':45, 'y':5}];
            backgroundColor:"#FF6384",
            hoverBackgroundColor: "#FF6384",
            }]
        };

        window.onload = function() {
            var ctx = document.getElementById("canvas").getContext("2d");
            window.myChart = new Chart(ctx, {
                type: 'bubble',
                data: bubbleChartData,
                options: {
                    responsive: true,
                    title:{
                        display:true,
                        text:'Attack chain'
                    },
                }
            });
        };






    </script>



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