云函数能console.log返回值 但是前端无法接收？

云函数 ：'use strict';
const db = uniCloud.database()
const $ = db.command.aggregate
exports.main = async (event, context) => {
// 执行第一个程序
const res = await db.collection('godown').aggregate()
.group({
_id: {
date: '$date',
warehouse: '$warehouse',
name: '$title'
},
sumamount: $.sum('$amount'),
totaltrunk: $.sum(1)
})
.sort({
date: 1
})
.end()

// 执行第二个程序
const outbound = await db.collection('outbound')
.aggregate()
.project({
goods: [
{ name: '$goods_name', amount: '$outamount' },
{ name: '$goods_name2', amount: '$outamount2' },
{ name: '$goods_name3', amount: '$outamount3' }
]
})
.unwind('$goods')
.group({
_id: '$goods.name',
totalAmount: $.sum('$goods.amount')
})
.end()

// 合并结果
let combinedResult = [];
for (let item of res.data) {
let found = outbound.data.find(o => o._id === item._id.name);
if (found) {
combinedResult.push({
name: item._id.name,
sumamount: item.sumamount,
totaltrunk: item.totaltrunk,
totalAmount: found.totalAmount
});
} else {
combinedResult.push(item);
}
}
console.log(combinedResult);
return combinedResult;
};

前端init() {
return uniCloud.callFunction({
name:'combinedResult'
}).then(combinedResult =>{
console.log('uniCloud.callFunction response:', combinedResult);
if (!combinedResult.result || !combinedResult.result.data) {
console.error('No data returned from uniCloud.callFunction');
return;
}
this.combinedResult = combinedResult.result.data

        let text = '';  
        const result = combinedResult.result.data  
        if (result) {  
            for (let i = 0; i < result.length; i++) {  
                text += 'name: ' + result[i].name + ', sumamount: ' + result[i].sumamount + ', totaltrunk: ' + result[i].totaltrunk + ', totalAmount: ' + result[i].totalAmount + '<br>';  
            }  
        } else {  
            text = 'No data available';  
        }  

        document.getElementById('demo').innerHTML = text;  
        console.log(text);  
        return text;  
    }).catch(error => {  
        console.error('Error calling uniCloud.callFunction:', error);  
    });  
}