Failed to create chart: can’t acquire context from the given item
chartObjs[i] = new Chart(“chart-box-“+i, v);
原因：chartjs只能获取canvas，如果是div就会报错
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Failed to create chart: can’t acquire context from the given item
chartObjs[i] = new Chart(“chart-box-“+i, v);
原因：chartjs只能获取canvas，如果是div就会报错
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