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var state = instanceOfFileReader.readyState


數字代表 FileReader API 三個可能的狀態:


規格 狀態 說明
File API
The definition of 'FileReader' in that specification.
Working Draft 初始化定義


We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

功能 Firefox (Gecko) Chrome Internet Explorer Opera Safari
基本支援 3.6 (1.9.2)[1] 7 10[2] 12.02[3] 6.0.2
功能 Firefox 手機版 (Gecko) Android IE 手機版 Opera 手機版 Safari 手機版
基本支援 32 3 10 11.5 6.1

[1] Prior to Gecko 2.0 beta 7 (Firefox 4.0 beta 7), all Blob parameters below were File parameters; this has since been updated to match the specification correctly. Prior to Gecko 13.0 (Firefox 13.0 / Thunderbird 13.0 / SeaMonkey 2.10) the FileReader.error property returned a FileError object. This interface has been removed and FileReader.error is now returning the DOMError object as defined in the latest FileAPI draft.

[2] IE9 has a File API Lab.

[3] Opera has partial support in 11.1.



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