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HomeWeb Front-endJS TutorialUse node to implement built-in debugging

这篇文章主要介绍了node内置调试的方法,并把代码做了分享,对此有需要的朋友可以参考学习下。

自从node6.3以来,node已经直接支持类似node-inpect的功能,只要对执行的js代码加入一个--inspect参数,即可使用chrome做代码调试。

本文使用如下工具:

  • node v9.5.0

  • chrome 64

首先准备待调试代码。如果这是为了学习的目的,可以使用我测试用代码为:

var objectRegExp = /^\[object (\S+)\]$/;
function gettype(obj) {
 var type = typeof obj;
 if (type !== 'object') {
  return type;
 }
 // inspect [[Class]] for objects
 return toString.call(obj)
  .replace(objectRegExp, '$1');
}
gettype({})
gettype(function(){})

然后运行此代码,加上参数--inspect-brk

node --inspect-brk a.js

系统提示:

Debugger listening on ws://127.0.0.1:9229/84960765-5abc-4236-a7c6-924f99c34ed7

打开浏览器,在地址栏内输入:

chrome://inspect/#devices

可以看到:

Remote Target
#LOCALHOST
Target (v9.5.0)
a.js
file:///Users/lcj/Documents/github/express/a.js
inspect

点击最后一行inspect,即可弹出一个新的窗口,此为调试器。并且调入代码到chrome调试器内,在执行命令的控制台上可以看到:

Debugger attached.

现在,可以使用点击调试器内的Run | Step | Step Into等按钮做调试了。

对于没有直接使用node执行的代码,比如测试用例mocha,怎么办?mocha也是支持这些选项的,比如express使用了mocha做单元测试,可以用如下命名来做调试:

mocha --require test/support/env --reporter spec --bail --check-leaks --no-exit test/app.router.js --inspect-brk -g 'should decode correct params

上面是我整理给大家的,希望今后会对大家有帮助。

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