Introduction knowledge system of Web front-end engineers

Windows Common shortcut key

        1、Shift

                a） Temporarily type out capital letters

                b） Cooperate with the direction keys to select text

        2、Ctrl

                a）Ctrl+C/Ctrl+V

                b） Use with direction keys , Realize jumping in words

        3、Home/End

                Jump directly to the beginning of the current line / ending （Shift+Home/End  Select a row ）

        4、Backspace/Delete： towards the left / Right delete

        5、Insert： stay “ Insert ” and “ Replace ” Switching between modes

        6、Windows： Open the start menu

                a）Windows+D    Display desktop

                b）Windows+E    Open Explorer （ My computer ）

                c）Windows+R    Open the run window （cmd window ）       

                        notepad（ Notepad ）

                        mspaint（ Drawing board ）

                        calc（ Calculator ）

        7、Alt+Tab： Switch window to the right

        8、Alt+Shift+Tab： Switch window to the left

History of Internet industry

        1950-1960 year ： The era of personal software development

                Ada： The world's first programmer    Debug（ debugging bug）

        1970-1980 year ： Team software development era

                Windows The Chinese file name in is incompatible with other systems , It will cause garbled code and cannot be opened

        1990 year ： The era of engineering software development

                appear “ Software Crisis ” => Begin to think about Develop software from an engineering perspective

        2000 year ： Internet software development era

                “ The Internet bubble burst ” => C/S Software （ client > The server > client ） towards B/S Software （ Client only ） transition => There are web development engineers

                B/S Software architecture

                        B：browser    browser , Also known as “ The user agent ”, Replace the user to find the server where the target is located , And request the corresponding file , Download the post rendering in the browser .

                        S：sever      The server , Store all the files necessary for the website

        2010 year ： Mobile Internet development era

                3G A smart phone => WEB Former Development Engineer => Applet / Little games => The front frame

Software life cycle ——（“ Three periods and eight stages ”）

1、 Software definition period

        a） Feasibility analysis stage ——《 Feasibility study report 》

                technical 、 Manpower 、 On funds 、 On the time 、 Rate of return 、 policy / law / Habitually

        b） Demand analysis stage ——《 Requirements specification / Project requirements specification 》

                Functional requirement points         Non functional requirement points

2、 Software development period

        a） Outline design stage —— Project architect

                Subsystem division 、 Module definition 、 implementation technique 、 Frame selection

        b） Detailed design stage —— Project design document

                page 、 object 、 function 、 Algorithm

        c） Development and implementation stage

                UI The designer => Front-end development engineer （ Development page ） => Back end Development Engineer （ Access data ）

        d） Project testing phase ——《 Test report 》

                α（ Internal measurement ）     β（ Public survey ）

                Black box testing （ A functional test ）    White box testing （ Structural testing ）

3、 Software maintenance period

        a） Project deployment phase —— Migrate code from the development environment to the production environment

        b） Project maintenance phase —— Responsible for later code maintenance 、 correct 、 Function, etc