网络：contentType,dataType,Accept区别

ContentType

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When sending data to the server, use this content type.
Default is “application/x-www-form-urlencoded;

DataType

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The type of data that you’re expecting back from the server.
If none is specified, jQuery will try to infer it based on the MIME type of the response (an XML MIME type will yield XML, in 1.4 JSON will yield a JavaScript object, in 1.4 script will execute the script, and anything else will be returned as a string).

Accept

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accepts (default: depends on DataType) Type: PlainObject The content type sent in the request header that*** tells the server what kind of response it will accept in return.*

总结

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1. contentType: 告诉服务器，我要发什么类型的数据
2. dataType：告诉服务器，我要想什么类型的数据，如果没有指定，那么会自动推断是返回 XML，还是JSON，还是script，还是String。
3. Accept：告诉服务器，能接受什么类型。

参考

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• DataType vs ContentType in jquery ajax [duplicate]
• dataType vs accepts - Ajax Request