【nodejs】关于 alert 和 document

Microsoft Windows [版本 6.1.7601]

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C:\Windows\system32>node

> alert

ReferenceError: alert is not defined

at repl:1:1

at REPLServer.defaultEval (repl.js:132:27)

at bound (domain.js:254:14)

at REPLServer.runBound [as eval] (domain.js:267:12)

at REPLServer.<anonymous> (repl.js:279:12)

at REPLServer.emit (events.js:107:17)

at REPLServer.Interface._onLine (readline.js:214:10)

at REPLServer.Interface._line (readline.js:553:8)

at REPLServer.Interface._ttyWrite (readline.js:830:14)

at ReadStream.onkeypress (readline.js:109:10)

> document

ReferenceError: document is not defined

at repl:1:1

at REPLServer.defaultEval (repl.js:132:27)

at bound (domain.js:254:14)

at REPLServer.runBound [as eval] (domain.js:267:12)

at REPLServer.<anonymous> (repl.js:279:12)

at REPLServer.emit (events.js:107:17)

at REPLServer.Interface._onLine (readline.js:214:10)

at REPLServer.Interface._line (readline.js:553:8)

at REPLServer.Interface._ttyWrite (readline.js:830:14)

at ReadStream.onkeypress (readline.js:109:10)

>

> var i = 0; while (i <= 5)

... {

... console.log("数字是 " + i)

... console.log("<br />")

... i++

... }

数字是 0

<br />

数字是 1

<br />

数字是 2

<br />

数字是 3

<br />

数字是 4

<br />

数字是 5

<br />

5

可以看得出v8引擎 alert和document是没有定义的，这不难理解，没有view就没有必要操作document了，不知道控制台（C# java）程序能否弹出一个对话框。

将前端代码移植到nodejs 需要重构代码，不能有dom操作。