addInfo(){
      let item = {title:'测试',money:8,category:'吃饭'}//要传给父组件的参数
      this.triggerEvent('addInfo',item)//通过triggerEvent将参数传给父组件
    },

<button type="primary" bindtap="addInfo">确定</button>

{
    "component": true,
    "usingComponents": {
        "add-item": "../demo/add"
    }
}

<add-item nowAddDate="{{isShowAdd}}" bind:addInfo="getAddInfo"></add-item>

getAddInfo(e){
    console.log(e.detail)//{title:'测试',money:8,category:'吃饭'} 
},