J's Study log

우리는 웹을 하루에도 수십 번 내지 수백 번은 사용한다. 이런 생각을 해본적이 있는가. '누가 그 많은 도메인을 관리할까?' 인터넷은 그저 많은 컴퓨터들을 IP를 주소로 잡아 서로 정보를 공유할 수 있도록 해주는 정보망에 불과하다. 우리가 IP를 123.456.789 처럼 일일이 입력해가며 서로의 정보를 찾아보기에는 너~무 귀찮다. 이 귀찮음의 대안책으로 만들어진 것이 바로 도메인이다. 도메인은 쉽게말해서 전화번호라고 볼 수 있다. 그리고 수 많은 전화번호들은 ICANN(국제인터넷주소관리기구 : Internet Corporation for Assigned Names and Numbers)를 통해 관리되고있다. 이렇게 만들어진 도메인의 숫자는 정말 많고 계속해서 늘어나는 중이다. gTLD(generic T..

Node.js use 'require()' function to call module. require('path of directory') For example, let's say there are two files called 'num.js' and 'sum.js'. //num.js var n = 10; //sum.js console.log(n); When you execute this sum.js the error will be occured. Because in scope of sum.js, 'num1' and 'num2' is not defined. So let's use 'require()' to call num.js module. //sum.js var num = require('../num...

URL : http://exampleurl.com:126/main?id=HTML&page=3 protocol : which way of internet to follow [http : HyperText Transfer Protocol] host : Computer which is connected to internet port : Web basically use port number '80' as default value path : means which directory's which file of the computer query string : passes informations such as what is which page to show, always starts with '?' and valu..

Attribute Attribute is used if tag have lack of information. For example, tag is used for putting an image in the page. HTML Hello HTML Let's start! Here comes an image Can't find out the image tag doesn't work, because there's no information about which image to call. So 'attribute' is used in this kind of situation, and by adding it expression of 'html' got more affluent. Put downloaded image ..

Frequency of tags usage https://www.advancedwebranking.com/html/ Tag is like the Alphabet of html. : shows that this file is made as a html file ..... : title of html file (title have high priority in search engine) : explaination about main text ..... : main text of html file ..... : text between tag describes WEB page, so cover list1 list2 list3 HTML Hypertext Markup Language (HTML) is the sta..

Factors can be declared in template. template class SimpleArray { private: T arr[len]; public: T &operator[] (int idx) { return arr[idx]; } }; int main(void) { SimpleArray i5Tint; SimpleArray i7Tdouble; i5Tint = i7Tdouble; //comfile error } Template Class Template class is built not only by 'T' but also 'int len'. So error in line17 is natural. Template class will be built like this code. class ..