"# node-red\u4e2d\u521b\u5efa\u81ea\u5b9a\u4e49\u8282\u70b9 JavaScript \u6587\u4ef6API\u7f16\u5199\u8be6\u89e3\n\n> 2023-02-01 | 2023-02-01\n> https:\/\/www.modbus.cn\/en\/11530.html\n\n**Node-RED**\n\n---\n\n## \u524d\u8a00\n\n\u5728node-red\u4e2d\u5982\u679c\u4f60\u6ca1\u6709\u627e\u5230\u81ea\u5df1\u9700\u8981\u7684\u8282\u70b9\u65f6\uff0c\u90a3\u4e48\u4f60\u53ef\u4ee5\u81ea\u5b9a\u4e49\u4e00\u4e2a\u8282\u70b9\u6765\u6ee1\u8db3\u81ea\u5df1\u7684\u9700\u6c42\u3002\u4e4b\u524d\u7684\u6587\u7ae0\u4e2d\uff0c\u6211\u6709\u7b80\u5355\u4ecb\u7ecd\u8fc7\u5982\u4f55\u521b\u5efa\u4e00\u4e2a\u8282\u70b9\uff0c\u5e76\u4ee5\u8f6c\u6362\u5927\u5c0f\u5199\u6765\u4e3e\u4f8b\u3002\u4f8b\u5b50\u867d\u7136\u7b80\u5355\uff0c\u4f46\u53ef\u4ee5\u8ba9\u5927\u5bb6\u4e86\u89e3\u521b\u5efa\u81ea\u5b9a\u4e49\u8282\u70b9\u7684\u6b65\u9aa4\u4ee5\u53ca\u4e00\u4e2a\u8282\u70b9\u7684\u7ec4\u6210\u90e8\u5206\u3002\u90a3\u4e48\u672c\u7bc7\u5c06\u4f1a\u805a\u7126\u5728\u81ea\u5b9a\u4e49\u8282\u70b9\u7684js\u6587\u4ef6\u4e2d\u3002\u8be6\u7ec6\u8bb2\u89e3\u5176\u4e2d\u7684api\uff0c\u53ca\u5176\u4ed6\u914d\u7f6e\u9879\u3002\u901a\u8fc7\u4e4b\u524d\u7684\u6587\u7ae0\u6211\u4eec\u77e5\u9053\uff0c\u8282\u70b9\u7684js\u6587\u4ef6\u662f\u4e00\u4e2a\u8282\u70b9\u7684\u6838\u5fc3\u6587\u4ef6\uff0c\u7528\u4e8e\u6536\u53d6\u914d\u7f6e\u53c2\u6570\uff0c\u5904\u7406\u4e1a\u52a1\u903b\u8f91\uff0c\u5e76\u5411\u4e0b\u6e38\u53d1\u9001\u6570\u636e\u3002\u4e0b\u9762\u8ba9\u6211\u4eec\u4e00\u8d77\u770b\u770b\u5427\u3002\n\n## \u81ea\u5b9a\u4e49\u8282\u70b9JavaScript \u6587\u4ef6\n\n### \u8282\u70b9\u6784\u5efa\u5668\n\n\u6240\u6709\u7684\u8282\u70b9\u90fd\u662f\u7531\u4e00\u4e2a\u6784\u5efa\u5668\u6765\u751f\u6210\u7684\u51fd\u6570\uff0c\u662f\u521b\u5efa\u7684\u4e00\u4e2a\u65b0\u7684\u5b9e\u4f8b\u3002\u8fd9\u4e2a\u51fd\u6570\u88ab\u6ce8\u518c\u5230\u8fd0\u884c\u65f6\u4e2d\uff0c\n\u8fd9\u4e2a\u51fd\u6570\u901a\u8fc7\u8bbe\u7f6e\u4e00\u4e2a\u914d\u7f6e\u5bf9\u8c61\u6765\u5b58\u5728\u4e8e\u6d41\u7f16\u8f91\u5668\u4e2d\u3002\n\u5728\u8be5\u51fd\u6570\u4e2d\uff0c\u7b2c\u4e00\u4ef6\u4e8b\u5c31\u662f\u8c03\u7528`RED.nodes.createNode`\u51fd\u6570\uff0c\u6765\u5e8f\u5217\u5316\u7279\u6027\uff0c\u88ab\u5176\u4ed6\u8282\u70b9\u5171\u4eab\u3002\u5728\u8fd9\u4e4b\u540e\n\n\u5c31\u53ef\u4ee5\u7f16\u5199\u4e1a\u52a1\u4ee3\u7801\u5566\u3002\n\u5982\u4e0b\n\n### \u63a5\u53d7\u4fe1\u606f\n\n\u8282\u70b9\u901a\u8fc7\u6ce8\u518c\u4e00\u4e2a`input`\u4e8b\u4ef6\u6765\u63a5\u53d7\u4e0a\u6e38\u8282\u70b9\u4e0b\u53d1\u7684\u4fe1\u606f\u5728\u6574\u4e2a\u6d41\u4e2d\u3002\u6ce8\u518c\u4e8b\u4ef6\u65f6\uff0c\u5728\u4e8b\u4ef6\u7684\u56de\u8c03\u51fd\u6570\u91cc\uff0c\u4f1a\u6709msg\u548csend\u4e24\u4e2a\u53c2\u6570\uff0cmsg\u5c31\u662f\u4e0a\u6e38\u4f20\u9012\u8fc7\u6765\u7684\u6570\u636e\u3002send\u662f\u8981\u4e0b\u53d1\u5230\u4e0b\u6e38\u7684\u4e00\u4e2a\u51fd\u6570\u3002\u7b2c\u4e09\u4e2a\u51fd\u6570 done \u662f\u8282\u70b9\u5b8c\u6210\u4e1a\u52a1\u903b\u8f91\u5904\u7406\u540e\u8c03\u7528\u7684\u51fd\u6570\u3002\n\u793a\u4f8b\n\n```\nfunction SampleNode(config) {\n    RED.nodes.createNode(this,config);\n    \/\/ node-specific code goes here\n\n}\n\nRED.nodes.registerType(\"sample\",SampleNode);\n```\n\n### \u63a5\u53d7\u4fe1\u606f\n\n\u8282\u70b9\u901a\u8fc7\u6ce8\u518c\u4e00\u4e2a`input`\u4e8b\u4ef6\u6765\u63a5\u53d7\u4e0a\u6e38\u8282\u70b9\u4e0b\u53d1\u7684\u4fe1\u606f\u5728\u6574\u4e2a\u6d41\u4e2d\u3002\u6ce8\u518c\u4e8b\u4ef6\u65f6\uff0c\u5728\u4e8b\u4ef6\u7684\u56de\u8c03\u51fd\u6570\u91cc\uff0c\u4f1a\u6709msg\u548csend\u4e24\u4e2a\u53c2\u6570\uff0cmsg\u5c31\u662f\u4e0a\u6e38\u4f20\u9012\u8fc7\u6765\u7684\u6570\u636e\u3002send\u662f\u8981\u4e0b\u53d1\u5230\u4e0b\u6e38\u7684\u4e00\u4e2a\u51fd\u6570\u3002\u7b2c\u4e09\u4e2a\u51fd\u6570 done \u662f\u8282\u70b9\u5b8c\u6210\u4e1a\u52a1\u903b\u8f91\u5904\u7406\u540e\u8c03\u7528\u7684\u51fd\u6570\u3002\n\u793a\u4f8b\n\n```\nthis.on('input', function(msg, send, done) {\n    \/\/ do something with 'msg'\n\n    \/\/ Once finished, call 'done'.\n    \/\/ This call is wrapped in a check that 'done' exists\n    \/\/ so the node will work in earlier versions of Node-RED (<1.0)\n    if (done) {\n        done();\n    }\n});\n```\n\n### \u4e0b\u53d1\u4fe1\u606f\n\n\u5728\u81ea\u5b9a\u4e49\u8282\u70b9\u4e2d\u5411\u4e0b\u6e38\u53d1\u9001\u4fe1\u606f\u975e\u5e38\u7684\u7b80\u5355\n\u53ea\u9700\u8981\u4f7f\u7528send\u51fd\u6570\u5373\u53ef\uff0c\u5982\u4e0b\n\n```\nvar msg = { payload:\"hi\" }\nthis.send(msg);\n```\n\n\u5982\u679c\u8282\u70b9\u60f3\u8981\u5728input\u4e8b\u4ef6\u4e2d\u5411\u4e0b\u6e38\u53d1\u9001\u4fe1\u606f\uff0c\u53ef\u4ee5\u8fd9\u6837\u505a\n\n```\nlet node = this;\nthis.on('input', function(msg, send, done) {\n    \/\/ For maximum backwards compatibility, check that send exists.\n    \/\/ If this node is installed in Node-RED 0.x, it will need to\n    \/\/ fallback to using `node.send`\n    send = send || function() { node.send.apply(node,arguments) }\n\n    msg.payload = \"hi\";\n    send(msg);\n\n    if (done) {\n        done();\n    }\n});\n```\n\n\u5728input\u4e8b\u4ef6\u7684\u56de\u8c03\u51fd\u6570\u4e2d\uff0c\u6709\u4e09\u4e2a\u53c2\u6570\uff0c\u7b2c\u4e00\u4e2a\u662f\u63a5\u53d7\u5230\u7684\u4fe1\u606f\uff0c\u7b2c\u4e8c\u4e2a\u662fsend\u51fd\u6570\uff0c\n\u7b2c\u4e09\u4e2a\u662fdone\u51fd\u6570\u3002\u5206\u522b\u6709\u4e0d\u540c\u7684\u4f7f\u7528\u573a\u666f\u3002\n\n\u5982\u679c\u8981\u5411\u4e0b\u6e38\u8f93\u5165\u591a\u4e2a\u53c2\u6570\u53ef\u4ee5\u8fd9\u6837\u5199\n\n```\nthis.send([ msg1 , msg2 ]);\n\nthis.send([ [msgA1 , msgA2 , msgA3] , msg2 ]);\n```\n\n### \u65e5\u8bb0\u4e8b\u4ef6\n\n\u5728\u81ea\u5b9a\u4e49\u8282\u70b9\u4e2d\u6253\u5370\u65e5\u5fd7\uff0c\u53ea\u9700\u5728this\u4e0b\u8c03\u7528log\uff0cwarn\u7b49\u65b9\u6cd5\u5373\u53ef\u3002\u65e5\u5fd7\u4f1a\u5728\u63a7\u5236\u53f0\u4e2d\u6253\u5370\u51fa\u6765\u3002\n\n```\nthis.log(\"Something happened\");\nthis.warn(\"Something happened you should know about\");\nthis.error(\"Oh no, something bad happened\");\n\n\/\/ Since Node-RED 0.17\nthis.trace(\"Log some internal detail not needed for normal operation\");\nthis.debug(\"Log something more details for debugging the node's behaviour\");\n```\n\n### \u8bbe\u7f6e\u72b6\u6001\n\n\u6709\u4e9b\u8282\u70b9\u4e3a\u4e86\u8868\u660e\u5df2\u7ecf\u914d\u7f6e\u6210\u529f\uff0c\u6216\u914d\u7f6e\u6709\u8bef\uff0c\u4f1a\u6709\u4e00\u4e2a\u72b6\u6001\u663e\u793a\u3002\n\u8be5\u72b6\u6001\u4e5f\u662f\u5728js\u6587\u4ef6\u4e2d\u8bbe\u7f6e\u7684\uff0c\u53ea\u9700\u8981\u8c03\u7528status\u5373\u53ef\u3002\n\u5982\u4e0b\n\n```\n`this.status({fill:\"red\",shape:\"ring\",text:\"disconnected\"});`\n```\n\nfill \u72b6\u6001\u7684\u989c\u8272\nshape \u72b6\u6001\u7684\u56fe\u6807\ntext \u72b6\u6001\u7684\u6587\u672c\n\n### \u81ea\u5b9a\u4e49\u8282\u70b9\u8bbe\u7f6e\n\n\u5982\u679c\u4f60\u5728\u5236\u4f5c\u8282\u70b9\u65f6\uff0c\u60f3\u8981\u5c06\u8282\u70b9\u7684\u4e00\u4e2a\u5c5e\u6027\u914d\u7f6e\u5230setting\u6587\u4ef6\u4e2d\uff0c\u90a3\u4e48\u53ef\u4ee5\u8fd9\u6837\u505a\u3002\n\u5047\u5982\u4f60\u7684\u8282\u70b9\u7c7b\u578b\u4e3a\uff0c`fizz-node`\uff0c\u5e76\u5c06\u5176\u4e2d\u7684`color` \u653e\u5230setting\u6587\u4ef6\u4e2d\uff0c\u90a3\u4e48\u5728setting\u6587\u4ef6\u4e2d\u4f60\u9700\u8981\u8fd9\u6837\u914d\u7f6e`fizzNodeColor`\u3002\n\u5728\u4f7f\u7528\u65f6\uff0c\u4f7f\u7528`RED.settings.fizzNodeColor`\u6765\u8bbf\u95ee\u3002\n\n---\n*modbus.cn*\n"