就像您所提到的那样,您可以使用FileReader.readAsDataURL
将图像转换为base64
编码的字符串,并将其发送到服务器解码:
document.getElementById('file').addEventListener('change', function() {
const reader = new FileReader();
reader.onload = function() {
const base64 = this.result.replace(/.*base64,/, '');
socket.emit('image', base64);
};
reader.readAsDataURL(this.files[0]);
}, false);
socket.on('image', async image => {
const buffer = Buffer.from(image, 'base64');
await fs.writeFile('/tmp/image', buffer).catch(console.error);
});
或者更好地使用FileReader.readAsArrayBuffer
来获取一个字节的数组,您将发送该数组到服务器。
document.getElementById('file').addEventListener('change', function() {
const reader = new FileReader();
reader.onload = function() {
const bytes = new Uint8Array(this.result);
socket.emit('image', bytes);
};
reader.readAsArrayBuffer(this.files[0]);
}, false);
socket.on('image', async image => {
const buffer = Buffer.from(image);
await fs.writeFile('/tmp/image', buffer).catch(console.error);
});
从服务器接收数据:
// Server side
socket.emit('image', image.toString('base64')); // image should be a buffer
socket.on('image', image => {
const img = new Image();
img.src = `data:image/jpg;base64,${image}`;
});