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//1.
this.bpmnModeler = new BpmnModeler({...})
// 2.
var modeling = this.bpmnModeler.get("modeling");
      const moddle = this.bpmnModeler._moddle;
      var conditionExpression = moddle.create("bpmn:FormalExpression", {
        body: "*****",
      });

modeling.updateProperties(sequenceFlowElement, {
        conditionExpression: conditionExpression,
      });

效果 

<sequenceFlow id="SequenceFlow_0a1jh0i" name="***" sourceRef="ExclusiveGateway_0xnmpvq" targetRef="EndEvent_0oz4jhu" magic:condiation="**">
      <conditionExpression xsi:type="tFormalExpression">***</conditionExpression>
    </sequenceFlow>

本文标签: jsBPMNConditionExpressionsequenceFlow