node.js REPL“未定义" [英] node.js REPL "undefined"

问题描述

从节点0.4.11升级到0.6.15，并注意到REPL(无参数的运行节点)在大多数命令或回车符返回后始终转储未定义" ...

Upgraded from node 0.4.11 to 0.6.15, and noticed the REPL (running node with no arguments) keeps dumping "undefined" after most commands or carriages returns...

这分散了我的注意力，并驱使我前进，如何禁用此功能?

It's distracting and driving me batty, how do you disable this?

> 
undefined
> 
undefined
> 
undefined
> 
undefined
> var x = 2
undefined
> x
2
>

推荐答案

请参阅Node.js REPL 文档页面.

See the Node.js REPL documentation page.

具体是这样:

如果ignoreUndefined设置为true，则repl如果为undefined，则不会输出命令的返回值.默认为false.

If ignoreUndefined is set to true, then the repl will not output return value of command if it's undefined. Defaults to false.

示例代码:

var net = require("net"),
    repl = require("repl");

repl.start(null, null, null, null, true);

示例输出:

> var x
> var blah

此外，您可以将node别名为

node -e "require('repl').start(null, null, null, null, true)"

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