doc: update half donut example
diff --git a/public/examples/ts/pie-half-donut.ts b/public/examples/ts/pie-half-donut.ts
index af83ac5..ed88193 100644
--- a/public/examples/ts/pie-half-donut.ts
+++ b/public/examples/ts/pie-half-donut.ts
@@ -4,7 +4,7 @@
titleCN: 半环形图
difficulty: 1
*/
-
+// This example requires ECharts v5.4.0 or later
option = {
tooltip: {
trigger: 'item'
@@ -22,13 +22,6 @@
// adjust the start and end angle
startAngle: 180,
endAngle: 360,
- label: {
- show: true,
- formatter(param) {
- // correct the percentage
- return param.name + ' (' + param.percent! * 2 + '%)';
- }
- },
data: [
{ value: 1048, name: 'Search Engine' },
{ value: 735, name: 'Direct' },
