An error occurred while uploading files using Ajax today. The data transmission method is completed by defining formData, and the submitted file object is also set as a dom object, but the request cannot be sent. F12 saw an error reported in the background: Uncaught TypeError: Illegal invocation. Baidu took a look and found a solution.
Solution: Add the following two parameters to the parameters of the ajax request:
$.ajax({ ..., processData: false, contentType: false, ...});Type: Boolean
Default value: true. By default, the data passed in through the data option, if it is an object (technically speaking, as long as it is not a string), it will be processed and converted into a query string to match the default content type “application/x-www-form-urlencoded” “. If you want to send DOM tree information or other information that you don’t want to convert, please set it to false.
contentType
Type: String
Default value: ” application/x-www-form-urlencoded“. The type of content encoding when sending information to the server.
The default value is suitable for most situations. If you explicitly pass a content-type to $.ajax() then it must be sent to the server (even if there is no data to send).
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