监听storage中数据的变化

方法封装：

updateStorage(name, value){
　　sessionStorage.setItem('name, newVal);
      const storageEvent = new Event('storage');
      Object.defineProperty(storageEvent, 'key', {
        value: name,
        enumerable: true
      })
      Object.defineProperty(storageEvent, 'newValue', {
        value: newVal,
        enumerable: true
      })
      window.dispatchEvent(storageEvent)
}

使用：index.vue

　mounted() {

　　window.addEventListener('storage', this.handleStorageEvent);

　},

　beforeDestroy() {

　　window.removeEventListener('storage', this.handleStorageEvent);

　},

methods(){
    handleStorageEvent(event){
        if(event.key === 'latitude'){
            let data = event.newValue;
        }              
    }
}