初始化项目，自 v1.7.1 版本开始

src/components/bpmnProcessDesigner/package/penal/flow-condition/FlowCondition.vue

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+<template>
+  <div class="panel-tab__content">
+    <el-form :model="flowConditionForm" label-width="90px" size="small">
+      <el-form-item label="流转类型">
+        <el-select v-model="flowConditionForm.type" @change="updateFlowType">
+          <el-option label="普通流转路径" value="normal" />
+          <el-option label="默认流转路径" value="default" />
+          <el-option label="条件流转路径" value="condition" />
+        </el-select>
+      </el-form-item>
+      <el-form-item label="条件格式" v-if="flowConditionForm.type === 'condition'" key="condition">
+        <el-select v-model="flowConditionForm.conditionType">
+          <el-option label="表达式" value="expression" />
+          <el-option label="脚本" value="script" />
+        </el-select>
+      </el-form-item>
+      <el-form-item
+        label="表达式"
+        v-if="flowConditionForm.conditionType && flowConditionForm.conditionType === 'expression'"
+        key="express"
+      >
+        <el-input
+          v-model="flowConditionForm.body"
+          style="width: 192px"
+          clearable
+          @change="updateFlowCondition"
+        />
+      </el-form-item>
+      <template
+        v-if="flowConditionForm.conditionType && flowConditionForm.conditionType === 'script'"
+      >
+        <el-form-item label="脚本语言" key="language">
+          <el-input v-model="flowConditionForm.language" clearable @change="updateFlowCondition" />
+        </el-form-item>
+        <el-form-item label="脚本类型" key="scriptType">
+          <el-select v-model="flowConditionForm.scriptType">
+            <el-option label="内联脚本" value="inlineScript" />
+            <el-option label="外部脚本" value="externalScript" />
+          </el-select>
+        </el-form-item>
+        <el-form-item
+          label="脚本"
+          v-if="flowConditionForm.scriptType === 'inlineScript'"
+          key="body"
+        >
+          <el-input
+            v-model="flowConditionForm.body"
+            type="textarea"
+            clearable
+            @change="updateFlowCondition"
+          />
+        </el-form-item>
+        <el-form-item
+          label="资源地址"
+          v-if="flowConditionForm.scriptType === 'externalScript'"
+          key="resource"
+        >
+          <el-input v-model="flowConditionForm.resource" clearable @change="updateFlowCondition" />
+        </el-form-item>
+      </template>
+    </el-form>
+  </div>
+</template>
+
+<script setup lang="ts" name="FlowCondition">
+const props = defineProps({
+  businessObject: Object,
+  type: String
+})
+const flowConditionForm = ref<any>({})
+const bpmnElement = ref()
+const bpmnElementSource = ref()
+const bpmnElementSourceRef = ref()
+const flowConditionRef = ref()
+const resetFlowCondition = () => {
+  bpmnElement.value = window.bpmnInstances.bpmnElement
+  bpmnElementSource.value = bpmnElement.value.source
+  bpmnElementSourceRef.value = bpmnElement.value.businessObject.sourceRef
+  if (
+    bpmnElementSourceRef.value &&
+    bpmnElementSourceRef.value.default &&
+    bpmnElementSourceRef.value.default.id === this.bpmnElement.id
+  ) {
+    // 默认
+    flowConditionForm.value = { type: 'default' }
+  } else if (!bpmnElement.value.businessObject.conditionExpression) {
+    // 普通
+    flowConditionForm.value = { type: 'normal' }
+  } else {
+    // 带条件
+    const conditionExpression = bpmnElement.value.businessObject.conditionExpression
+    flowConditionForm.value = { ...conditionExpression, type: 'condition' }
+    // resource 可直接标识 是否是外部资源脚本
+    if (flowConditionForm.value.resource) {
+      // this.$set(this.flowConditionForm, "conditionType", "script");
+      // this.$set(this.flowConditionForm, "scriptType", "externalScript");
+      flowConditionForm.value['conditionType'] = 'script'
+      flowConditionForm.value['scriptType'] = 'externalScript'
+      return
+    }
+    if (conditionExpression.language) {
+      // this.$set(this.flowConditionForm, "conditionType", "script");
+      // this.$set(this.flowConditionForm, "scriptType", "inlineScript");
+      flowConditionForm.value['conditionType'] = 'script'
+      flowConditionForm.value['scriptType'] = 'inlineScript'
+
+      return
+    }
+    // this.$set(this.flowConditionForm, "conditionType", "expression");
+    flowConditionForm.value['conditionType'] = 'expression'
+  }
+}
+const updateFlowType = (flowType) => {
+  // 正常条件类
+  if (flowType === 'condition') {
+    flowConditionRef.value = window.bpmnInstances.moddle.create('bpmn:FormalExpression')
+    window.bpmnInstances.modeling.updateProperties(toRaw(bpmnElement.value), {
+      conditionExpression: flowConditionRef.value
+    })
+    return
+  }
+  // 默认路径
+  if (flowType === 'default') {
+    window.bpmnInstances.modeling.updateProperties(toRaw(bpmnElement.value), {
+      conditionExpression: null
+    })
+    window.bpmnInstances.modeling.updateProperties(toRaw(bpmnElementSource.value), {
+      default: bpmnElement.value
+    })
+    return
+  }
+  // 正常路径，如果来源节点的默认路径是当前连线时，清除父元素的默认路径配置
+  if (
+    bpmnElementSourceRef.value.default &&
+    bpmnElementSourceRef.value.default.id === bpmnElement.value.id
+  ) {
+    window.bpmnInstances.modeling.updateProperties(toRaw(bpmnElementSource.value), {
+      default: null
+    })
+  }
+  window.bpmnInstances.modeling.updateProperties(toRaw(bpmnElement.value), {
+    conditionExpression: null
+  })
+}
+const updateFlowCondition = () => {
+  let { conditionType, scriptType, body, resource, language } = flowConditionForm.value
+  let condition
+  if (conditionType === 'expression') {
+    condition = window.bpmnInstances.moddle.create('bpmn:FormalExpression', { body })
+  } else {
+    if (scriptType === 'inlineScript') {
+      condition = window.bpmnInstances.moddle.create('bpmn:FormalExpression', { body, language })
+      // this.$set(this.flowConditionForm, "resource", "");
+      flowConditionForm.value['resource'] = ''
+    } else {
+      // this.$set(this.flowConditionForm, "body", "");
+      flowConditionForm.value['body'] = ''
+      condition = window.bpmnInstances.moddle.create('bpmn:FormalExpression', {
+        resource,
+        language
+      })
+    }
+  }
+  window.bpmnInstances.modeling.updateProperties(toRaw(bpmnElement.value), {
+    conditionExpression: condition
+  })
+}
+
+onBeforeUnmount(() => {
+  bpmnElement.value = null
+  bpmnElementSource.value = null
+  bpmnElementSourceRef.value = null
+})
+
+watch(
+  () => props.businessObject,
+  (val) => {
+    if (val) {
+      nextTick(() => {
+        resetFlowCondition()
+      })
+    }
+  }
+)
+</script>