问Vue.js -地理定位不适用于移动设备.为什么？

EN

<template>
    <div>
        <p>Click the button to get your coordinates.</p>
        <button @click="getLocation">Try It</button>
        <p id="demo" v-text="text"></p>
    </div>
</template>

<script>
    export default {
        data(){
            return {
                text: 'Hier wird deine Latitude und Longitude angezeigt.',
                lat: '',
                lng: ''
            }
        },
        methods: {
            getLocation() {
                if (window.navigator.geolocation) {
                    window.navigator.geolocation.getCurrentPosition(this.showPosition);
                } else { 
                    text = "Geolocation is not supported by this browser.";
                }
            },
            showPosition(position) {
                this.lat = position.coords.latitude,
                this.lng = position.coords.longitude,
                this.text = "deine Location befindet sich in: Latitude:" + this.lat + " und Longitude: " + this.lng;
            } 

        }
    }
</script>

<style lang="scss">
</style>