localStorage设置失效时间

const foowwLocalStorage = {
	set: function (key, value, ttl_ms) {
		var data = { value: value, expirse: new Date(ttl_ms).getTime() };
		localStorage.setItem(key, JSON.stringify(data));
	},
	get: function (key) {
		var data = JSON.parse(localStorage.getItem(key));
		if (data !== null) {
			if (data.expirse != null && data.expirse < new Date().getTime()) {
				localStorage.removeItem(key);
				return null;
			} else {
				return data.value;
			}
		}else{
			return null;
		}
	}
}