通过javascript将base64字符串转换为字节数组 [英] Convert base64 string into byte array through javascript
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问题描述
我想通过javascript将"base64"字符串转换为字节数组.
I want to convert "base64" string into bytes array through the javascript.
我从URL收到了类似的字符串.
I received string from the URL like.
("data:image/jpeg;base64,/9j/4QN6RXhpZgAASUkqAAgAAAAIA)
我想将字符串转换为字节数组.因为我需要此字节数组来发送Rest API端点.其余的API Content-type = application/octet-stream.
And i want to convert the string into bytes array. because i need this byte array to send Rest API endpoint. The rest API Content-type=application/octet-stream.
推荐答案
您可以尝试以下操作;
You can try with the following;
function test(base64StringFromURL)
{
var parts = base64StringFromURL.split(";base64,");
var contentType = parts[0].replace("data:", "");
var base64 = parts[1];
var byteArray = base64ToByteArray(base64);
..
}
function base64ToByteArray(base64String) {
try {
var sliceSize = 1024;
var byteCharacters = atob(base64String);
var bytesLength = byteCharacters.length;
var slicesCount = Math.ceil(bytesLength / sliceSize);
var byteArrays = new Array(slicesCount);
for (var sliceIndex = 0; sliceIndex < slicesCount; ++sliceIndex) {
var begin = sliceIndex * sliceSize;
var end = Math.min(begin + sliceSize, bytesLength);
var bytes = new Array(end - begin);
for (var offset = begin, i = 0; offset < end; ++i, ++offset) {
bytes[i] = byteCharacters[offset].charCodeAt(0);
}
byteArrays[sliceIndex] = new Uint8Array(bytes);
}
return byteArrays;
} catch (e) {
console.log("Couldn't convert to byte array: " + e);
return undefined;
}
}
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