连接Buffer对象的正确方法

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var buffers = [];
var nread = 0;
readStream.on('data', function (chunk) {
buffers.push(chunk);
nread += chunk.length;
});
readStream.on('end', function () {
var buffer = null;
switch(buffers.length) {
case 0: buffer = new Buffer(0);
break;
case 1: buffer = buffers[0];
break;
default:
buffer = new Buffer(nread);
for (var i = 0, pos = 0, l = buffers.length; i < l; i++) {
var chunk = buffers[i];
chunk.copy(buffer, pos);
pos += chunk.length;
}
break;
}
});