javascript-WebSockets和文本编码
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我读：
The WebSocket API accepts a DOMString object, which is encoded as
UTF-8 on the wire, or one of ArrayBuffer, ArrayBufferView, or Blob
objects for binary transfers.
DOMString是UTF-16编码的字符串.那么在网上使用UTF-8编码是否正确？
解决方法:
是的,这是正确的.
UTF-16可能会或可能不会在内存中使用,这只是您所使用的任何框架的实现细节.对于JavaScript,字符串为UTF-16.
对于WebSocket通信,必须在线使用UTF-8来存储文本数据(当今大多数Internet协议都使用UTF-8).这是由WebSocket protocol specification决定的：
After a successful handshake, clients and servers transfer data back and forth in conceptual units referred to in this specification as “messages”. On the wire, a message is composed of one or more frames. The WebSocket message does not necessarily correspond to a particular network layer framing, as a fragmented message may be coalesced or split by an intermediary.
A frame has an associated type. Each frame belonging to the same message contains the same type of data. Broadly speaking, there are types for textual data (which is interpreted as UTF-8 [RFC3629] text), binary data (whose interpretation is left up to the application), and control frames (which are not intended to carry data for the application but instead for protocol-level signaling, such as to signal that the connection should be closed). This version of the protocol defines six frame types and leaves ten reserved for future use.
…
Data frames (e.g., non-control frames) are identified by opcodes where the most significant bit of the opcode is 0. Currently defined opcodes for data frames include 0x1 (Text), 0x2 (Binary). Opcodes 0x3-0x7 are reserved for further non-control frames yet to be defined.
Data frames carry application-layer and/or extension-layer data. The opcode determines the interpretation of the data:
Text
The “Payload data” is text data encoded as UTF-8. Note that a particular text frame might include a partial UTF-8 sequence; however, the whole message MUST contain valid UTF-8. Invalid UTF-8 in reassembled messages is handled as described in Section 8.1.
Binary
The “Payload data” is arbitrary binary data whose interpretation is solely up to the application layer.
您将确保从UTF-16到UTF-8到UTF-16的少量开销,但是在现代计算机上开销很小,并且UTF之间的转换是无损的.
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