uniapp 要求页面子组件每隔10秒请求一次接口，将实现过程记录下来。

主页面

主页面需要监听页面的显示 卸载 隐藏事件，并将事件通知给子组件。

onShow() {
	var that = this;
	uni.$emit('onShow', 1);
},
onUnload() {
	var that = this;
	uni.$emit('onUnload', 1);
},
onHide() {
	var that = this;
	uni.$emit('onHide', 1);
},

子组件

当子组件加载后创建定时，并监听主页面的通知，当页面隐藏或卸载时，清除定时请求。

mounted() {
	var that = this;
	that.getdata()
	that.timer = setInterval(() => {
		that.getdata()
	}, 10000);
	uni.$on('onShow', function(data) {
		that.timer = setInterval(() => {
			that.getdata()
		}, 10000);
	});
	uni.$on('onUnload', function(data) {
		clearInterval(that.timer);
		that.timer = null;
	});
	uni.$on('onHide', function(data) {
		clearInterval(that.timer);
		that.timer = null;
	});
},
//当组件销毁时，清除监听，避免重复监听。
destroyed() {
	var that = this;
	uni.$off('onShow')
	uni.$off('onUnload')
	uni.$off('onHide')
	clearInterval(that.timer);
},
beforeDestroy() {
	var that = this;
	uni.$off('onShow')
	uni.$off('onUnload')
	uni.$off('onHide')
	clearInterval(that.timer);
},