1、錯誤描述

> y.copy(0,10);
TypeError: argument should be a Buffer
    at TypeError (native)
    at repl:1:3
    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)
>
 

buffer.copy(Buffer對象,開始寫入處);

但是這裏Buffer對象寫成了0

3、解決辦法

> y=Buffer(‘wo ai ni‘);
<Buffer 77 6f 20 61 69 20 6e 69>
> o=Buffer(128);
<Buffer 00 00 00 00 01 00 00 00 80 61 37 02 00 00 00 00 02 00 00 00 00 00 00 00
88 94 43 00 00 00 00 00 01 00 00 00 00 00 00 00 e8 aa 43 00 00 00 00 00 02 00 ..
. >
> o.fill(0);
<Buffer 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 
 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ..
. >
> o;
<Buffer 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ..
. >
> y.copy(0,10);
TypeError: argument should be a Buffer
    at TypeError (native)
    at repl:1:3
    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)
> y.copy(o,10);
8
> o;
<Buffer 00 00 00 00 00 00 00 00 00 00 77 6f 20 61 69 20 6e 69 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ..
. >
>

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TypeError argument should be a Buffer