1、错误描述

 

> const assert=require('assert');
TypeError: Identifier 'assert' has already been declared
    at repl:1:1
    at REPLServer.defaultEval (repl.js:262:27)
    at bound (domain.js:287:14)
    at REPLServer.runBound [as eval] (domain.js:300:12)
    at REPLServer.<anonymous> (repl.js:431:12)
    at emitOne (events.js:82:20)
    at REPLServer.emit (events.js:169:7)
    at REPLServer.Interface._onLine (readline.js:211:10)
    at REPLServer.Interface._line (readline.js:550:8)
    at REPLServer.Interface._ttyWrite (readline.js:827:14)
>

2、错误原因

     由错误提示可知assert标识符已经声明了

 

3、解决办法

     不能用关键字、标识符命名

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