Blob.type
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.
語法
var mimetype = instanceOfFile.type
值
一個字串。
範例
js
var i, fileInput, files, allowedFileTypes;
// fileInput 是個 HTMLInputElement: <input type="file" multiple id="myfileinput">
fileInput = document.getElementById("myfileinput");
// files 是個 FileList 物件 (類似 NodeList)
files = fileInput.files;
// 這範例接受 *.png, *.jpeg 和 *.gif 圖片。
allowedFileTypes = ["image/png", "image/jpeg", "image/gif"];
for (i = 0; i < files.length; i++) {
// 測試 file.type 是否是允許的類別。
if (allowedFileTypes.indexOf(files[i].type) > -1) {
// 若符合則執行這裡的程式碼。
}
});
規格
Specification |
---|
File API # dfn-type |
瀏覽器相容性
Report problems with this compatibility data on GitHubdesktop | mobile | server | ||||||||||||
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type |
Legend
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- Full support
- Full support
- Has more compatibility info.
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.