节点红色函数添加和删除对象从上下文数组
我在节点红色函数中有一个for循环，即我从上下文中获得数组的函数的开始
var alarmArray = flow.get("alarmArray")
，以及我需要在数组上推动对象，但我没有在流程上下文阵列上进行pusch在本地数组
alarmArray.push({
key: "Low air pressure",
value: alarm1Cip
});
flow.set("alarm1CipOld",alarm1Cip);
和之后，在for循环中，我需要从上下文中删除对象，但是以我的方式将其从本地数组中删除，
for (var key in alarmArray){
node.warn(key);
msg.payload = {
"title": alarmArray[key].key,
"isActive":alarmArray[key].value
};
node.send(msg)
delete alarmArray[key]
}
如何在上下文数组中设法添加和删除对象？ 谢谢
I have a for loop in the node red function that a the start of the function I get the array from the context
var alarmArray = flow.get("alarmArray")
and after I need to push object on the array I have do this but I'm not pusching on the flow context array but in the local array
alarmArray.push({
key: "Low air pressure",
value: alarm1Cip
});
flow.set("alarm1CipOld",alarm1Cip);
and after in the for loop I need to remove the object from the context but in my way I remove it from local array
for (var key in alarmArray){
node.warn(key);
msg.payload = {
"title": alarmArray[key].key,
"isActive":alarmArray[key].value
};
node.send(msg)
delete alarmArray[key]
}
how can I manage to add and remove object in the context array?
thanks
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这里的问题是Nodejs是通过参考语言的通过。这意味着这里没有2个阵列，只有1个具有2个手柄（
var alarmarray和flow.get.get（'armardArray'））这意味着任何推动/删除的东西在“本地”副本上，也将在上下文中将/删除到副本上。
每次您从上下文中恢复它，然后在本地进行副本时，做您想做的事情的唯一方法是将数组的深层复制。
假设数组仅容纳简单的对象，则以下内容应起作用：
The problem here is that NodeJS is a pass by reference language. This means that there are not 2 arrays here, only 1 that has 2 handles (
var alarmArrayandflow.get('alarmArray'))This means that anything pushed/deleted on the "local" copy is also getting pushed/deleted to the copy in the context.
The only way to do what you want will be to make a deep copy of the array every time you recover it from the context and then work on the copy locally.
Assuming the array only holds simple objects then the following should work:
如果要保存更改，则只需要在正确的上下文中重新加载突变的对象
If you want to save your changes you just have to reload the mutated object in the right context, overwriting the previous value with
您最好使用global.set而不是flow.set
这可能会对您有所帮助。
You might better to use global.set instead of flow.set
This might help you.