node.js script fails - TypeError: Object 0 has no method 'on' - Mac to Arduino UNO

Question

当我尝试运行此 uvsensor.js script from this plot.ly tutorial 时遇到此错误消息。解决它的最佳方法是什么？

uv-sensor-tutorial $ node uvsensor.js
1421612122362 Device(s) /dev/cu.usbmodem1411
1421612125588 Connected /dev/cu.usbmodem1411
1421612125588 Repl Initialized
>> { streamstatus: 'All Streams Go!',
  url: 'https://plot.ly/~micahstubbs/46',
  message: '',
  warning: '',
  filename: 'uv sensing nodey arduino!',
  error: '' }

/Users/m/workspace/arduino-projects/uv-sensor-tutorial/uvsensor.js:76
    refLevel.on("data", function() {
             ^
TypeError: Object 0 has no method 'on'
    at /Users/m/workspace/arduino-projects/uv-sensor-tutorial/uvsensor.js:76:14
    at /Users/m/node_modules/plotly/index.js:87:17
    at IncomingMessage.<anonymous> (/Users/m/node_modules/plotly/index.js:255:9)
    at IncomingMessage.EventEmitter.emit (events.js:117:20)
    at _stream_readable.js:920:16
    at process._tickCallback (node.js:415:13)

Answer 1

解决它的最佳方法是找出为什么 refLevel 被分配 0 而不是您认为应该分配的对象。

node.js script fails - TypeError: Object 0 has no method 'on' - Mac to Arduino UNO

node.js script fails - TypeError: Object 0 has no method 'on' - Mac to Arduino UNO

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