最近我在我的 Windows 7 机器上安装了 node.js.
Recently I installed node.js on my Windows 7 machine.
在执行 JavaScript 时,我收到一条 undefined 消息以及表达式的成功执行.
On execution of JavaScript, I get an undefined message along with successful execution of the expression.
这里有什么问题?我没有注意到任何其他副作用.
What's wrong here? I have not noticed any other side effects.
只要写 "hello world";
然后回车...它会返回 "hello world"
而不是 undefined
,因此不会显示 undefined
.console.log
返回 undefined
并将参数记录到控制台,以便您获得多条消息.
Just write "hello world";
and hit enter... it will return "hello world"
instead of undefined
, thus no undefined
is displayed. console.log
returns undefined
and also logs arguments to console so you get multiple messages.
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