html部分

<template>
	<view>
		<view>手机号：{{phone || '请获取手机号'}}</view>
		<button open-type="getPhoneNumber" @getphonenumber="getPhoneNumber">获取用户手机号</button> 
	</view>
</template>

js部分

<script>
	import { getPhone } from './api';
	export default {
		data() {
			return {
				phone: null
			}
		},
		methods: {
			getPhoneNumber(e) {
				getPhone(e.detail.code).then(res => {
					this.phone = res.phoneNum;
				});
			}
		}
	}
</script>

api部分

export function getPhone(code) {
	return request({
		method: 'get',
		url: `api/wxapi/getPhoneNum?code=${code}`
	});
}