ethers.js在uniapp真机调试上出现could not detect network (event="noNetwork"

import {
		mapState
	} from 'vuex';
	import {uniIcons} from '@dcloudio/uni-ui'
	import { ethers } from 'ethers'
	export default {
		components: {uniIcons},
		data() {
			return {
				provider: null,
				balance: '0.0000000',
			};
		},
		onLoad(){
			this.provider = new ethers.providers.JsonRpcProvider('https://ropsten.infura.io/v3/58514c44f8ee4bf1a194591ef047b***');
			console.log(this.provider)
			this.getBalance()
		},
		computed:{
			...mapState(['hasLogin'])
		},
		methods: {
			getBalance(){
				let address = "0xEf40248793A14eD0d5B6Bc493bB559f5168cac91";
				this.provider.getBalance(address).then((balance) => {
				    // 余额是 BigNumber (in wei); 格式化为 ether 字符串
				    this.balance = ethers.utils.formatEther(balance);
				});
			}
		}
	}

真机（iPhone6）调试上就出现上面的问题，获取余额的时候出现的。 在 HBuilderX 编辑器上面 H5 版的就正常，可以显示余额：