어쩌면 당연한건데.. 먼가 생소하게만 느껴지는 녀석
The maximum number of decimals is 17, but floating point arithmetic is not always 100% accurate: Example var x = 0.2 + 0.1; // x will be 0.30000000000000004 |
| HTML border style 지정 (0) | 2018.11.30 |
|---|---|
| 브라우저 닫기, 창 이동시 이벤트 (0) | 2018.11.30 |
| js object array sort by key (0) | 2018.11.21 |
| wavesurfer.js 그리고 HE-AACv2 (0) | 2018.11.21 |
| requireJS (0) | 2018.11.21 |
에어 코리아 API 한번 발급받아 볼까 하는데
기술문서를 보니 XML과 JSON으로 된다고 해서 검색..
[링크 : https://www.data.go.kr/dataset/15000581/openapi.do]
| node.js 혹은 sqlite? (0) | 2018.11.26 |
|---|---|
| node.js sqlite3 (0) | 2018.11.26 |
| node.js mysql blob (0) | 2018.11.23 |
| sqlite for node.js (0) | 2018.11.21 |
| node.js swagger (0) | 2018.11.12 |
mysql.escape()
[링크 : https://stackoverflow.com/.../er-parse-error-on-node-mysql-when-inserting-multiple-values]
timestamp는 CURRENT_TIMESTAMP 로 설정시 자동으로 입력됨
[링크 : https://blog.naver.com/star_breeze/220534943357]
이것저것 해보는데.. new Buffer().toString()이 유효했다!
$ node > var tt = [39,91,92,39,105,110,112,117,116,35,115,101,108,95,48,95,49,92,39,44,92,39,105,110,112,117,116,35,115,101,108,95,48,95,51,92,39,44,92,39,105,110,112,117,116,35,115,101,108,95,48,95,53,92,39,93,39] undefined > var buffer = new Buffer(tt) undefined > buffer <Buffer 27 5b 5c 27 69 6e 70 75 74 23 73 65 6c 5f 30 5f 31 5c 27 2c 5c 27 69 6e 70 75 74 23 73 65 6c 5f 30 5f 33 5c 27 2c 5c 27 69 6e 70 75 74 23 73 65 6c 5f ... > > buffer.toString('base64') 'J1tcJ2lucHV0I3NlbF8wXzFcJyxcJ2lucHV0I3NlbF8wXzNcJyxcJ2lucHV0I3NlbF8wXzVcJ10n' > var buffer = new Buffer(tt, 'binary') undefined > buffer.toString('base64') 'J1tcJ2lucHV0I3NlbF8wXzFcJyxcJ2lucHV0I3NlbF8wXzNcJyxcJ2lucHV0I3NlbF8wXzVcJ10n' > tt.toString('utf-8') '39,91,92,39,105,110,112,117,116,35,115,101,108,95,48,95,49,92,39,44,92,39,105,110,112,117,116,35,115,101,108,95,48,95,51,92,39,44,92,39,105,110,112,117,116,35,115,101,108,95,48,95,53,92,39,93,39' > buffer.toString('utf-8') '\'[\\\'input#sel_0_1\\\',\\\'input#sel_0_3\\\',\\\'input#sel_0_5\\\']\'' > new Buffer(tt).toString( ... 'utf-8') '\'[\\\'input#sel_0_1\\\',\\\'input#sel_0_3\\\',\\\'input#sel_0_5\\\']\'' > new Buffer(tt).toString() '\'[\\\'input#sel_0_1\\\',\\\'input#sel_0_3\\\',\\\'input#sel_0_5\\\']\'' |
[링크 : https://stackoverflow.com/questions/9042327/node-js-reading-blob-from-mysql]
[링크 : https://gist.github.com/akirattii/86e2eda8e110976cce144c991e9cada8]
그나저나 escape의 향연 어쩔꺼야...
+
mysql에 BLOB 타입으로 JSON을 저장하면
node.js에서는 아래와 같이 Buffer에다가 값을 넣고 toString() 으로 문자열로 바꾸어준 다음
mysql.escape()를 통해 \" 식으로 된걸 원래대로 돌려주어야 한다.
server-side(node.js)
mysql.escape(new Buffer(row.element).toString("utf-8")); |
그리고 받는 쪽에서는 JSON이 아닌 일반 plain-text니까
JSON.parse를 통해서 JSON으로 변환해 주어야 한다.(eval은 빼도 되는지 확인 필요)
client-side(chrome, web browser)
JSON.parse(eval(data.json)); |
| node.js sqlite3 (0) | 2018.11.26 |
|---|---|
| node.js xml <-> json (0) | 2018.11.25 |
| sqlite for node.js (0) | 2018.11.21 |
| node.js swagger (0) | 2018.11.12 |
| node.js axios delete에 body 쓰기 (0) | 2018.11.12 |
| 브라우저 닫기, 창 이동시 이벤트 (0) | 2018.11.30 |
|---|---|
| javascript 변수 정확도 (0) | 2018.11.26 |
| wavesurfer.js 그리고 HE-AACv2 (0) | 2018.11.21 |
| requireJS (0) | 2018.11.21 |
| [Violation] 'setInterval' handler took (0) | 2018.11.18 |
[링크 : https://beta.observablehq.com/@mbostock/d3-multi-line-chart]
d3.v4
d3.line
[링크 : https://bl.ocks.org/d3noob/4db972df5d7efc7d611255d1cc6f3c4f]
[링크 : https://codepen.io/zakariachowdhury/pen/JEmjwq]
d3 3.5.3
[링크 : https://bl.ocks.org/larsenmtl/e3b8b7c2ca4787f77d78f58d41c3da91]
+ 2018.11.22
[링크 : http://bl.ocks.org/hunzy/11110940] grid
| d3 axis (0) | 2018.11.27 |
|---|---|
| d3 온도/습도 그래프 (0) | 2018.11.26 |
| d3.time.format (0) | 2018.11.21 |
| d3 pie 칸색 바꾸기 (0) | 2018.11.15 |
| d3 update 두번째 검색내용.. (0) | 2018.11.15 |
크롬에서는 HE-AACv2를 지원하지 않는건가? edge는 되는데 머야...
Uncaught (in promise) DOMException: Unable to decode audio data
[링크 : https://bugs.chromium.org/p/chromium/issues/detail?id=409402]
[링크 : https://bugs.chromium.org/p/chromium/issues/detail?id=534301]
[링크 : https://github.com/katspaugh/wavesurfer.js/issues/703]
| javascript 변수 정확도 (0) | 2018.11.26 |
|---|---|
| js object array sort by key (0) | 2018.11.21 |
| requireJS (0) | 2018.11.21 |
| [Violation] 'setInterval' handler took (0) | 2018.11.18 |
| JSON.stringify() 주의사항(?) (0) | 2018.11.17 |
node.js 예제를 보다 보면
분명히(?) client side인데 require가 있어서 보는 중..
require.js로 JS들을 조건부 load 할 수 있다고 하는데...
[링크 : https://requirejs.org/docs/commonjs.html]
AMD는 Asynchronous Module Definition (비동기 모듈 정의) 규칙이다.
[링크 : https://blog.pigno.se/post/157992405313]
// EITHER - accessing modules with <script> tags var WaveSurfer = window.WaveSurfer; var TimelinePlugin = window.WaveSurfer.timeline; var MinimapPlugin = window.WaveSurfer.minimap; // OR - importing as es6 module import WaveSurfer from 'wavesurfer.js'; import TimelinePlugin from 'wavesurfer.js/dist/plugin/wavesurfer.timeline.min.js'; import MinimapPlugin from 'wavesurfer.js/dist/plugin/wavesurfer.minimap.min.js'; // OR - importing as require.js/commonjs modules var WaveSurfer = require('wavesurfer.js'); var TimelinePlugin = require('wavesurfer.js/dist/plugin/wavesurfer.timeline.min.js'); var MinimapPlugin = require('wavesurfer.js/dist/plugin/wavesurfer.minimap.min.js'); // ... initialising waveform with plugins var wavesurfer = WaveSurfer.create({ container: '#waveform', waveColor: 'violet', plugins: [ TimelinePlugin.create({ container: '#wave-timeline' }), MinimapPlugin.create() ] }); |
| js object array sort by key (0) | 2018.11.21 |
|---|---|
| wavesurfer.js 그리고 HE-AACv2 (0) | 2018.11.21 |
| [Violation] 'setInterval' handler took (0) | 2018.11.18 |
| JSON.stringify() 주의사항(?) (0) | 2018.11.17 |
| canvas to input type=file formdata (0) | 2018.11.15 |
sqlite3 패키지를 설치한다.
[링크 : https://www.npmjs.com/package/sqlite3]
| node.js xml <-> json (0) | 2018.11.25 |
|---|---|
| node.js mysql blob (0) | 2018.11.23 |
| node.js swagger (0) | 2018.11.12 |
| node.js axios delete에 body 쓰기 (0) | 2018.11.12 |
| mysql jwt plain object payload (0) | 2018.11.09 |
식별자로 바로바로 나온다.
근데.. 먼가 좀 직관적이지 않네?
var formatMillisecond = d3.timeFormat(".%L"), formatSecond = d3.timeFormat(":%S"), formatMinute = d3.timeFormat("%I:%M"), formatHour = d3.timeFormat("%I %p"), formatDay = d3.timeFormat("%a %d"), formatWeek = d3.timeFormat("%b %d"), formatMonth = d3.timeFormat("%B"), formatYear = d3.timeFormat("%Y"); |
| d3 온도/습도 그래프 (0) | 2018.11.26 |
|---|---|
| d3 multi line graph (0) | 2018.11.21 |
| d3 pie 칸색 바꾸기 (0) | 2018.11.15 |
| d3 update 두번째 검색내용.. (0) | 2018.11.15 |
| d3 update enter (0) | 2018.11.12 |
걍 경고인가 문제가 있는건가.. 모르겠네
[링크 : https://forum.vuejs.org/t/how-to-debug-chrome-violation-message-handler-took/36928/2]
+
2018.11.19
"Chrome violations" don't represent Chrome bugs or app errors. They are warnings intended to help you improve your script. Here, Chrome is alerting you there's probably an opportunity to speed up your script. ("Violation" is arguably misleading terminology; what it really means is that the script violates a pre-defined guideline. These messages first appeared in Chrome in early 2017 and should ideally have a "More info" prompt to elaborate on the meaning and give suggested actions to the developer. Hopefully those will be added in the future.) |
[링크 : https://stackoverflow.com/.../javascript-chrome-violation-violation-handler-took-83ms-of-runtime]
| wavesurfer.js 그리고 HE-AACv2 (0) | 2018.11.21 |
|---|---|
| requireJS (0) | 2018.11.21 |
| JSON.stringify() 주의사항(?) (0) | 2018.11.17 |
| canvas to input type=file formdata (0) | 2018.11.15 |
| jwt token ajax (2) | 2018.11.08 |
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