在节点红流中使用节点模块bignum

Using node module bignum in a node-red flow

本文关键字：节点 模块 bignum 红流      更新时间：2023-09-26

我正试图在节点红流中的函数中使用节点模块bignum。我已经将节点模块安装在与settings.js相同的文件夹中

functionGlobalContext: {
   bignum:require('bignum')
},

我的功能看起来像这个

var bignum = context.global.bignum;
var b = bignum('782910138827292261791972728324982')
    .sub('182373273283402171237474774728373')
    .div(8)
msg.payload = b;
return msg;

出于某种原因，它只返回这个

[msg.payload] : object
{}

bignum作为msg.payload传递，只是在调试面板中没有正确呈现

这可以通过以下流程进行检查

[{"id":"4559ab0b.848204","type":"function","name":"","func":"var bignum = context.global.bignum;'n'nvar b = bignum('782910138827292261791972728324982')'n    .sub('182373273283402171237474774728373')'n    .div(8);'n'nmsg.payload = b;'n'nconsole.log('"%j'", msg.payload);'nconsole.log('"%j'", b);'nconsole.log(b);'nconsole.log('"%j'", msg);'n'nreturn msg;","outputs":1,"noerr":0,"x":413,"y":186,"z":"6dffe97f.085fd8","wires":[["152e806f.249de8"]]},{"id":"28153711.bd78f","type":"inject","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"x":203,"y":140,"z":"6dffe97f.085fd8","wires":[["4559ab0b.848204"]]},{"id":"62001fd9.03c0c8","type":"debug","name":"","active":true,"console":"false","complete":"false","x":712,"y":191,"z":"6dffe97f.085fd8","wires":[]},{"id":"152e806f.249de8","type":"function","name":"","func":"console.log('"2'");'nconsole.log(msg.payload);'nreturn msg;","outputs":1,"noerr":0,"x":543,"y":256,"z":"6dffe97f.085fd8","wires":[["62001fd9.03c0c8"]]}]

我会在这里打开一个问题来查看

更新

这很可能是因为bignum没有实现toString方法，所以Node RED不知道如何呈现输出。解决这个问题的最好方法可能是用bignum而不是Node RED来引发问题。

更新2

节点RED问题具有最新信息

https://github.com/node-red/node-red/issues/690

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