使用Chartjs角度按值对图例项目进行排序和隐藏

var options = {
  legend: {
    display: true,
    position: 'right',
    labels: {
      generateLabels: function(chart) {
        var data = chart.data;
        if (data.labels.length && data.datasets.length) {
          return data.labels.map(function(label, i) {
            var meta = chart.getDatasetMeta(0);
            var ds = data.datasets[0];
            var arc = meta.data[i];
            var custom = arc && arc.custom || {};
            var getValue = function(index) {
              return ds.data[index];
            };
            var hide = custom.hide || getValue(i) === 0;
            return {
              text: label,
              fillStyle: hide ? 'transparent' : custom.color || ds.backgroundColor[i],
              hidden: chart.isDatasetVisible(i),
              index: i
            };
          });
        }
        return [];
      }
    }
  }
};

var options = {
  legend: {
    onClick: function(e, legendItem) {
      var index = legendItem.datasetIndex;
      var meta = this.chart.getDatasetMeta(index);
      meta.hidden = meta.hidden === null ? !this.chart.data.datasets[index].hidden : null;
      this.chart.update();
    }
  }
};