在这里我们用一个最常用的应用场景来说明 Node-Red 是如何工作的
人体传感器感应到人就开灯
为了实现以上场景，我们需要用到两个基本节点，如下：
首先拖一个 单条件触发节点 出来放置于编辑区的任意位置，并双击该节点进行设置：
不要忘记设置完成后点击右上角的部署按钮进行部署
然后再拖一个操作节点出来放在编辑区的任意位置，并双击该节点进行设置：
这样两个节点就都设置好了，现在我们把两个节点连起来并点击部署让这个流生效：
这里需要说明的是这个连线为什么要从第一个点连出去，把鼠标指上去悬停就可以看到如下：
当触发节点设置触发条件后，该节点会产生两个输出点（可以连线的点），第一个代表满足你设置的条件，那么第二个代表不满足，用户可根据自己的需要进行连线
小技巧：
当需要创建多个类似流的时候不需要一遍一遍重复拖放设置的步骤，可以直接用鼠标框选住已经创建好的流，按 Ctrl + C 复制，然后 Ctrl + V 粘贴即可
在这里附上这个流，可以自行导入后并修改节点里的设置，然后部署看看效果
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