use-on-demand
Version:
61 lines • 2.57 kB
JavaScript
var xX_FileBlobBase64_Helper = /** @class */ (function () {
function xX_FileBlobBase64_Helper() {
}
/**
* 【Base64】格式，转【Blob】格式。
*/
xX_FileBlobBase64_Helper.base64ToBlob = function (base64) {
var _a;
var arr = base64.split(',');
var mime = (_a = arr[0].match(/:(.*?);/)) === null || _a === void 0 ? void 0 : _a[1];
var bstr = atob(arr[1]);
var n = bstr.length;
var u8arr = new Uint8Array(n);
while (n--) {
u8arr[n] = bstr.charCodeAt(n);
}
return new Blob([u8arr], { type: mime });
};
/**
* 【Base64】格式，转【Uint8Array】格式。
*/
xX_FileBlobBase64_Helper.url_base64_To_Uint8Array = function (base64String) {
var padding = '='.repeat((4 - base64String.length % 4) % 4);
var base64 = (base64String + padding)
.replace(/\-/g, '+')
.replace(/_/g, '/');
var rawData = window.atob(base64);
var outputArray = new Uint8Array(rawData.length);
for (var i = 0; i < rawData.length; ++i) {
outputArray[i] = rawData.charCodeAt(i);
}
return outputArray;
};
/**
* 【Blob】格式，转【File】格式。
* 1.附加参考资料：[node.js - How to convert Blob to File in JavaScript - Stack Overflow](https://stackoverflow.com/a/29390393/6264260)
*/
xX_FileBlobBase64_Helper.blobToFile = function (theBlob, fileName) {
var b = theBlob;
// A Blob() is almost a File() - it's just missing the two properties below which we will add
b.lastModifiedDate = new Date();
b.name = fileName;
// Cast to a File() type
return theBlob;
};
/**
* 【File】格式，转【Base64】格式。
* 1.附加参考资料：[How to convert file to base64 in JavaScript? - Stack Overflow](https://stackoverflow.com/questions/36280818/how-to-convert-file-to-base64-in-javascript)
*/
xX_FileBlobBase64_Helper.fileToBase64 = function (file) {
return new Promise(function (resolve, reject) {
var reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function () { return resolve(reader.result); };
reader.onerror = function (error) { return reject(error); };
});
};
return xX_FileBlobBase64_Helper;
}());
export { xX_FileBlobBase64_Helper };
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