node.js

问题 I have got a express server, which creates a pdf file. I am trying to send this file to the client: const fs = require('fs'); function download(req, res) { var filePath = '/../../myPdf.pdf'; fs.readFile(__dirname + filePath, function(err, data) { if (err) throw new Error(err); console.log('yeyy, no errors :)'); if (!data) throw new Error('Expected data, but got', data); console.log('got data', data); res.contentType('application/pdf'); res.send(data); }); } On the client I want to download it

问题 Is there a way to list all JavaScript standard object method? I mean I'm trying to get all the built in methods of String so I was thinking and I did tried doing this: for( var method in String ) { console.log( method ); } // I also tried this: for( var method in String.prototype ) { console.log( method ); } But no luck. Also if there is a way that solution should work for all ECMAScript standard classes/objects. Edit: I want to point out that the solution should work in server side

问题 I can't run a Conda command using exec with my NodeJS app. var conda_path = '~/miniconda3/bin/conda' var cmd = conda_path + ' init bash & ' + conda_path + ' activate XYZ' exec(command, function(error, stdout, stderr){ } ); I get the following error: /bin/sh: /Users/username/Desktop/repos/project/XYZ: is a directory CommandNotFoundError: Your shell has not been properly configured to use 'conda activate'. To initialize your shell, run $ conda init <SHELL_NAME> Currently supported shells are: -

问题 I have food db listing similar to: { Name: "burger", ingredients: [ {Item:"bread"}, {Item:"cheese"}, {Item:"tomato"} ] } How can I find documents that have the most similar items in ingredients ? 回答1: First of all, your data should be remodelled as below: { name: "Burger", ingredients: [ "bread", "cheese", "tomato", "beef" ] } The extra "Item" does not add any additional information nor does it help accessing the data in any way. Next, you need to create a text index. The docs state that text

问题 Is there any way to write API which will convert normal image into Progressive Using Nodejs. I don't want to use Base64. I have done so much R & D on this. One library i found i.e lib turbo-jpeg But in this only they are decoding the image .I want to encode that image too. Please check this below link for reference. If anyone got any solution then please let me know. Link is - https://github.com/LinusU/cwasm-jpeg-turbo Please help me out to write API to convert image into progreesive. Thank

问题 I'm confused about Promise! I use Promise then without return like this: new Promise((resolve, reject) => { resolve("1"); }).then((v1) => { console.log("v1"); new Promise((resolve, reject) => { //Time-consuming operation, for example: get data from database; setTimeout(() => { resolve(2) }, 3000); }).then((v11) => { console.log("v11"); }) }).then((v2) => { console.log("v2") }); I get this result v1 v2 v11 . Then, I use another way of writing, Like below: new Promise((resolve, reject) => {

问题 Is there any way to write API which will convert normal image into Progressive Using Nodejs. I don't want to use Base64. I have done so much R & D on this. One library i found i.e lib turbo-jpeg But in this only they are decoding the image .I want to encode that image too. Please check this below link for reference. If anyone got any solution then please let me know. Link is - https://github.com/LinusU/cwasm-jpeg-turbo Please help me out to write API to convert image into progreesive. Thank

问题 I'm trying to filter data using "and" and "or" conditions. I would like to get this mySql query: SELECT * FROM `data` WHERE ((`property1`=11) OR (`property1`=13)) AND (`property2`=6) The rest api that I wrote is like this: http://localhost:4000/api/Data/?filter[where][or][0][property1]=11&filter[where][or][1][property1]=13&filter[where][and][0][property2]=6 The loopback json translation seems to be correct: { "or": [ { "property1": 11 }, { "property1": 13 } ], "and": [ { "property2": 6 } ] }

问题 I want to update all password values from an object in all object levels: let obj = { user: { name: 'u1', password: 'do not show me' }, subUsers: [ { name: 'u2', password: 'do not show me as well' } ], whereverLevel : { password: 'please, hide me too' } } updateDeeply(obj, 'password', '********') //mutates obj and changes all password values in all object levels. Is there an API method like lodash _.set(...) ? 回答1: Simple recursive solution, handling objects and arrays, mutating input –

问题 I am trying to start a new protractor project to test an angular site. I installed node.js, typescript, protractor globally and jasmine. I go to the project folder and do webdriver-manager update . Then I do webdriver-manager start . I also build the config.ts using tsc config.ts . Everything works fine until i try protractor config.ts . Here i will provide my config.ts and my package.json. { "name": "protractortests", "version": "1.0.0", "description": "Automated tests for a game platform",