效果–

//window.WeFormSDK.showMessage("这是一个E10的提示", 3, 2);
 // 获取表单实例
    const weFormSdk = window.WeFormSDK.getWeFormInstance();
    // 获取主表字段fieldId
    const bt = weFormSdk.convertFieldNameToId("bt");
    const lcbh = weFormSdk.convertFieldNameToId("lcbh");
    // 绑定事件，对主表字段和明细表的某一行绑定
    weFormSdk.bindDetailFieldChangeEvent(`${bt},${lcbt}`, (data) =>{
        // 取字段标识
        const fieldMark = data.id;
        // 取字段修改的值
        const value = data.value;
        console.log(data);
      window.WeFormSDK.openCustomDialog({
      content: "数据：" + JSON.stringify(data),
      width: "400px",
      height: "300px"
       });
    });