node.js

问题 Does node.js support writing random access? I see this package, but it doesn't work (if I write two or more parts, the file is corrupt) 回答1: fs core library should suffice for that. Here is the list of functions to use: fs.open(path, flags, [mode], callback) fs.write(fd, buffer, offset, length, position, callback) fs.writeSync(fd, buffer, offset, length, position) fs.read(fd, buffer, offset, length, position, callback) fs.readSync(fd, buffer, offset, length, position) They are analogous to

问题 If i have following code to send data repeatedly to client every 10ms: setInterval(function() { res.write(somedata); }, 10ms); What would happen if the client is very slow to receive the data? Will server get out-of-memory error? Edit: actually the connection is kept alive, sever send jpeg data endlessly (HTTP multipart/x-mixed-replace header + body + header + body.....) Because node.js response.write is asynchronous, so some users guess it may store data in internal buffer and wait until low

问题 Does node.js support writing random access? I see this package, but it doesn't work (if I write two or more parts, the file is corrupt) 回答1: fs core library should suffice for that. Here is the list of functions to use: fs.open(path, flags, [mode], callback) fs.write(fd, buffer, offset, length, position, callback) fs.writeSync(fd, buffer, offset, length, position) fs.read(fd, buffer, offset, length, position, callback) fs.readSync(fd, buffer, offset, length, position) They are analogous to

问题 If i have following code to send data repeatedly to client every 10ms: setInterval(function() { res.write(somedata); }, 10ms); What would happen if the client is very slow to receive the data? Will server get out-of-memory error? Edit: actually the connection is kept alive, sever send jpeg data endlessly (HTTP multipart/x-mixed-replace header + body + header + body.....) Because node.js response.write is asynchronous, so some users guess it may store data in internal buffer and wait until low

问题 If i have following code to send data repeatedly to client every 10ms: setInterval(function() { res.write(somedata); }, 10ms); What would happen if the client is very slow to receive the data? Will server get out-of-memory error? Edit: actually the connection is kept alive, sever send jpeg data endlessly (HTTP multipart/x-mixed-replace header + body + header + body.....) Because node.js response.write is asynchronous, so some users guess it may store data in internal buffer and wait until low

问题 I'm the author of a Node.js library and I want to use Async Hooks to improve DX. But I'm worried about performance. I've read stories saying that everything is fine, as well as stories where performance was a blocker. In theory, asynchronicity should only happen for IO operations and performance penality should be pretty much ~0. (As IO operations are several orders of magnitude more expensive than running JS code.) But, in practice, does running extra JS on each async call induces a non

问题 I'm the author of a Node.js library and I want to use Async Hooks to improve DX. But I'm worried about performance. I've read stories saying that everything is fine, as well as stories where performance was a blocker. In theory, asynchronicity should only happen for IO operations and performance penality should be pretty much ~0. (As IO operations are several orders of magnitude more expensive than running JS code.) But, in practice, does running extra JS on each async call induces a non

问题 I'm the author of a Node.js library and I want to use Async Hooks to improve DX. But I'm worried about performance. I've read stories saying that everything is fine, as well as stories where performance was a blocker. In theory, asynchronicity should only happen for IO operations and performance penality should be pretty much ~0. (As IO operations are several orders of magnitude more expensive than running JS code.) But, in practice, does running extra JS on each async call induces a non

问题 I'm the author of a Node.js library and I want to use Async Hooks to improve DX. But I'm worried about performance. I've read stories saying that everything is fine, as well as stories where performance was a blocker. In theory, asynchronicity should only happen for IO operations and performance penality should be pretty much ~0. (As IO operations are several orders of magnitude more expensive than running JS code.) But, in practice, does running extra JS on each async call induces a non

问题 I'm making a extension for VSCode. What method is generally to store data? For example, settings for each user, not for each workspace. I knew the way to store data in user's workspace. But it is troublesome to set values for each workspace again and again. 回答1: I've found a answer by myself. ExtensionContext.globalState https://code.visualstudio.com/api/extension-capabilities/common-capabilities Code Sample(read and write) function method_registerCommand(context){ var store = context