java script

PPT 84 стр. 2,2 МБ Бесплатная загрузка

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java script * java script * vvedenie yazik programmirovaniya javascript bil razrabotan firmoy netscape v sotrudnichestve s sun microsystems i anansirovan v 1995 godu. javascript prednaznachen dlya sozdaniya interaktivnix html-dokumentov. osnovnie oblasti ispolzovaniya javascript: sozdanie dinamicheskix stranits, t.e. stranits, soderjimoe kotorix mojet menyatsya posle zagruzki. proverka pravilnosti zapolneniya polzovatelskix form. reshenie "lokalnix" zadach s pomoshyu stsenariev. javascript-kod - osnova bolshinstva ajax-prilojeniy. * chto delaet javascript !! javascript daet html dizayneram instrument programmirovaniya - html avtori, kak pravilo, ne programmisti, no javascript eto yazik stsenariev s ochen prostim sintaksisom! pochti kajdiy mojet polojit nebolshie "fragmenti" koda na svoix stranitsax html javascript mojet postavit dinamicheskiy tekst v html stranitsu - a javascript zayavlenie tak: document.write(" " + imya + " "); mojet napisat peremenniy tekst v html stranitsu javascript mojet reagirovat na sobitiya - javascript mojet bit ustanovlen, chtobi vipolnit, kogda chto-to proisxodit, naprimer, kogda zaversheniya zagruzki stranitsi ili kogda polzovatel najimaet …

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$achinayutsya s // mnogostrochniy kommentariy /*-kommentariy- */ * javascript v sektsii body budut vipolneni vo vremya zagruzki stranits. javascript v header sektsii budut vipolneni pri vizove javascript predstavlyaet soboy posledovatelnost instruktsiy dlya vipolneniya v brauzere. document.write(" this is a header "); document.write(" this is a paragraph "); document.write(" this is another paragraph "); * zayavleniya javascript mogut bit sgruppirovani v bloki. { document.write(" this is a header "); document.write(" this is a paragraph "); document.write(" this is another paragraph "); } ispolzovanie vneshnego fayla * myhtml.html : enjoy !!!!!! test.js : document.write("hello i am from test"); * ob'yavlenie peremennix var x=5; var name=“abcd” _________________________________________________ { var x="the number is" , y=50; document.write(x+y); } * var x = 12.5 + 7.5; document.write(x); kakov rezultat:: …… “12.5”……. * what is the output ? var x = "12.5"; var y = 7.5 var a = parsefloat(x); document.write(a+y); * var x = "ab12.5"; var …$

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$ion disp_prompt() { var name=prompt("please enter your name", "kufliddin makhmazaiitov"); if (name!=null && name!="") { document.write("hello " + name + "! how are you today?"); } } * arifmeticheskiy operator + ,-,*,/,% operator sravneniya , =,== operator prisvaivaniya uslovniy operator greeting=(visitor=="pres")?"dear president ":"dear "; logicheskiy operator logicheskie operatsii obichno ispolzuetsya dlya ob'edineniya neskolkix sravneniy v uslovnom virajenii * var x = 10; alert("the value of x is = " +x); 10 alert("the value of x+x is = " +(x+x)); alert("the value of x-x is = " +(x-x)); alert("the value of x*x is = " +(x*x)); alert("the value of x/x is = " +(x/x)); alert("the value of x%3 is = " +(x%3)); alert("the value of --x is = " +(--x)); alert("the value of ++x is = " +(++x)); alert("the value of -x is = " +(-x)); * * var x = 10; var y = 5; alert ("the value of x …$

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rclearea(r) { var result = 3.14 * r * r; return result; } hello(); document.write("sum of two number is " +add(12,32)+ " "); document.write("area of circle is " +circlearea(5)); * function myfunction() { alert("hello"); } pri najatii na knopku, funktsiya budet vizivatsya. funktsiya budet opoveshat soobshenie. * sozdat javascript fayl dlya: peredachi parametra v funktsiyu funktsiya vozvrashaet znachenie lokalnaya peremennaya: kogda mi opredelyaem peremennuyu vnutri funktsii, ona mojet bit dostup tolko v funktsiyax, globalnaya peremennaya : kogda mi opredelyaem peremennuyu vne funktsii, ona mojet bit dostupna na vsex funktsiy * tsikl: var i=0; for (i=0;i "); } * var x =19,a; for(a = 1;a "); } * function table(form) { var x = form.num.value; var a; for(a = 1;a "); } } enter number : * napishite programmu, chtobi skopirovat soderjimoe odnogo tekstovogo polya k drugomu tekstovom pole. napishite programmu dlya otobrajeniya ploshad kruga v tekstovom pole. radius zadaetsya polzovatelem …

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$n message() { try { addalert("welcome guest!"); } catch(err) { txt="oshibke na etoy stranitse.\n\n"; txt+=" opisanie oshibki : " + err.description + "\n\n"; txt+="click ok to continue.\n\n"; alert(txt); } } * obrabotka sobitiy kajdiy element na veb-stranitse imeet opredelennie sobitiya, kotorie mogut vizvat funktsii javascript. naprimer, mi mojem ispolzovat sobitie onclick iz elementa knopki, chtobi ukazat, chto funktsiya budet rabotat, kogda polzovatel najimaet na knopku. opredelim sobitiya v html tegov * primer nekotorix sobitiy onclick sobitie proisxodit, kogda ob'ekt poluchaet najal ondbclick sobitie ispolzuetsya dlya dvoynoy shelchok * nekotorie sobitie tela : onresize() : esli vi xotite izmenit razmer dokumenta, eto sobitie generiruetsya. onload() : eto sobitie generiruetsya, kogda mi zagrujaem ili otkroem dokument v brauzere. onunload() : eto sobitie generiruetsya, kogda mi zakrivaem dokument v brauzere. * onselect() event : eto sobitie otnositsya na tekstovoe pole i oblasti teksta, kogda polzovatel xochet videlit. hello world! please select me !!! …$

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О "java script"

java script * java script * vvedenie yazik programmirovaniya javascript bil razrabotan firmoy netscape v sotrudnichestve s sun microsystems i anansirovan v 1995 godu. javascript prednaznachen dlya sozdaniya interaktivnix html-dokumentov. osnovnie oblasti ispolzovaniya javascript: sozdanie dinamicheskix stranits, t.e. stranits, soderjimoe kotorix mojet menyatsya posle zagruzki. proverka pravilnosti zapolneniya polzovatelskix form. reshenie "lokalnix" zadach s pomoshyu stsenariev. javascript-kod - osnova bolshinstva ajax-prilojeniy. * chto delaet javascript !! javascript daet html dizayneram instrument programmirovaniya - html avtori, kak pravilo, ne programmisti, no javascript eto yazik stsenariev s ochen prostim sintaksisom! pochti kajdiy mojet polojit nebolshie "fragmenti" koda na svoix s...

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