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Java エンジニアのためのJavaScript講座
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Takeshi Kawajiri
April 24, 2013
Technology
4
1.2k
Java エンジニアのためのJavaScript講座
JJUG Night Seminar.
http://kokucheese.com/event/index/85227/
Takeshi Kawajiri
April 24, 2013
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Transcript
݄ !L[SJ ++6(φΠτɾηϛφʔ ʮ+BWBΤϯδχΞͷͨΊͷ+BWB4DSJQUߨ࠲ʯ ໊ࢺԦࠃͱͭͷଜͷ
৲߶ 4*
/&8
"MMZPVSCBTFBSFCFMPOHUPVT
ετΞΞϓϦ
None
None
None
+BWB4DSJQU ։ൃऀͷڞ௨ݴޠ
ΩʔϝοηʔδΛதԝʹදࣔ ϑΥϯτ ώϥΪϊ֯ΰ4UE/QU +BWB4DSJQUͷॻ੶ʹৄ͍͠ େઌੜ ૉࡐ ࠓ
None
+BWBͷ ઓ࢜ 1SPHSBNNFS ຐ๏͍ )BDLFS ૐཿ 2"
ಈࢺଜ ໊ࢺଜ ϥϜμଜ
Ճ(ᣀ, 105); ͢_ϖΫνϯ(ᣀ); ࠞͥΔ(ϨϞϯ, ᣀ); ಈࢺଜ
໊ࢺଜ new ು; ು.͢(ᣀ); ು.Ճ(105); ು.͢(ϖΫνϯ);
ϥϜμଜ $(ᣀ).Ճ(λ{ Թ < 105 }).ࠞͥΔ(ϖΫνϯ, λ{ Ώͬ͘Γͱ }).ࠞͥΔ(...
ಈࢺଜ ໊ࢺଜ ϥϜμଜ
ຊͷΰʔϧ
wΞδΣϯμ w։ൃڥ wجຊͱΦϒδΣΫτ wධՁͱ࣮ߦ wϓϩτλΠϓνΣʔϯ wUIJTଋറ wείʔϓνΣʔϯ
ݥͷ४උ
None
None
ຊؾʹͳͬͨΒ
None
None
None
None
None
None
ϞμϯΛࣹఔڑʹஔ͘
ಈࢺଜ
var a = 1; function func(b) { return a +
b; } func(10); //=> 11
var a = 1; function func(b) { return a +
b; } func(10); //=> 11 มએݴ
var a = 1; function func(b) { return a +
b; } func(10); //=> 11 ؔએݴ
var a = 1; function func(b) { return a +
b; } func(10); //=> 11 Ҿ ฦΓ
var a = 1; function func(b) { return a +
b; } func(10); //=> 11 ֎෦มͷࢀর
var a = 1; function func(b) { return a +
b; } func(10); //=> 11 ؔݺͼग़͠
var a = 1; function func(b) { return a +
b; } func(10); //=> 11 ࣝผࢠ
var a = 1; function func(b) { return a +
b; } func(10); //=> 11
ϓϦϛςΟϒ ͱ ΦϒδΣΫτ
ͱ OFX/VNCFS
B ͱ OFX4USJOH B
۠ผͰ͖ͳ͍ ͱ ۠ผͰ͖Δ
ͱ OFX/VNCFS OFX/VNCFS
Λ͢ ͱ ࢀরΛ͢
WBSBC ͱ WBSBC OFX/VNCFS
୯Ұͷ ͱ ঢ়ଶΛ࣋ͭ
var n = new Number(1); n["prop1"] = 1; n["prop1"]; //=>
1 n.prop2 = 2; n.prop2; //=>2 Ç QSPQ O QSPQ
ϓϦϛςΟϒ ΦϒδΣΫτ ൺֱ ಉੑ ಉҰੑ ೖ ࢀর ঢ়ଶͷอ࣋ ʷ
˓
wϓϦϛςΟϒ ‣ /B/ ‣จࣈྻ B BC
‣ਅِ USVF GBMTF ‣OVMM ‣VOEFpOFE
wΦϒδΣΫτ ‣0CKFDU ‣"SSBZ ‣/VNCFS ‣4USJOH ‣#PPMFBO ‣'VODUJPOͳͲ
wΦϒδΣΫτ ‣0CKFDU ‣"SSBZ ‣/VNCFS ‣4USJOH ‣#PPMFBO ‣'VODUJPOͳͲ
var obj = new Object; obj.a = 1; obj.a; //=>
1 var obj = { a: 1 }; obj.a; //=>1
var arr = new Array; arr[0] = 1; arr[0]; //=>
1 var arr = [1, 2]; arr[0]; //=> 1
var arr = [1, 2]; arr[100] = 3; arr.a =
1; BSS B
wΦϒδΣΫτ ‣0CKFDU ‣"SSBZ ‣/VNCFS ‣4USJOH ‣#PPMFBO ‣'VODUJPOͳͲ
new Number(1) + new Number(2); //=> 3
(1).a = 1; (1).a; //=> undefined; (new Number(1)).a = 1;
(new Number(1)).a; //=> undefined
wΦϒδΣΫτ ‣0CKFDU ‣"SSBZ ‣/VNCFS ‣4USJOH ‣#PPMFBO ‣'VODUJPOͳͲ
function a(){} var b = a; b(); var c =
function() { }; c();
var obj = { m: function(a) { return a +
1; } }; obj.m(1); //=> 2
ධՁͱ࣮ߦ
var a, b = 1; a = 2; function c(d)
{ var e = 5; } c(2);
var a, b = 1; a = 2; function c(d)
{ var e = 5; } c(2);
a(); function a(){} b(); //ERROR var b = function(){};
TDSJQU IUNM
var a, b = 1; a = 2; function c(d)
{ var e = 5; } c(2);
var a = 1; function f1() { var b =
2; function f2() { var c = 3; }; }
if(false) { var a = 1; } for(var i=0; i<3;
i++) { }
໊ࢺଜ
function My(a) { this.a = a; } My.prototype = {
m1: function(b) { return this.a + b; } }; var my = new My(1); my.a; //=> 1 my.a = 2; my.m1(10); //=> 12
function My(a) { this.a = a; } My.prototype = {
m1: function(b) { return this.a + b; } }; var my = new My(1); my.a; //=> 1 my.a = 2; my.m1(10); //=> 12 OFXࣜ
function My(a) { this.a = a; } My.prototype = {
m1: function(b) { return this.a + b; } }; var my = new My(1); my.a; //=> 1 my.a = 2; my.m1(10); //=> 12 ίϯετϥΫλ
function My(a) { this.a = a; } My.prototype = {
m1: function(b) { return this.a + b; } }; var my = new My(1); my.a; //=> 1 my.a = 2; my.m1(10); //=> 12 Πϯελϯε
function My(a) { this.a = a; } My.prototype = {
m1: function(b) { return this.a + b; } }; var my = new My(1); my.a; //=> 1 my.a = 2; my.m1(10); //=> 12 ϓϩτλΠϓ
function My(a) { this.a = a; } My.prototype = {
m1: function(b) { return this.a + b; } }; var my = new My(1); my.a; //=> 1 my.a = 2; my.m1(10); //=> 12 ϝιου
function My(a) { this.a = a; } My.prototype = {
m1: function(b) { return this.a + b; } }; var my = new My(1); my.a; //=> 1 my.a = 2; my.m1(10); //=> 12
.Z OFX ίϯετϥΫλ Πϯελϯε B
function My(a) { this.a = a; } My.prototype = {
m1: function(b) { return this.a + b; } }; var my = new My(1); my.a; //=> 1 my.a = 2; my.m1(10); //=> 12
N .Z OFX ίϯετϥΫλ ϓϩτλΠϓ Πϯελϯε ҕৡ QSPUPUZQF B
function My(a) { this.a = a; } My.prototype = {
m1: function(b) { return this.a + b; } }; var my = new My(1); my.a; //=> 1 my.a = 2; my.m1(10); //=> 12 OFX0CKFDU
N .Z OFX ίϯετϥΫλ ϓϩτλΠϓ Πϯελϯε ҕৡ QSPUPUZQF UP4USJOH 0CKFDU
ҕৡ ϓϩτλΠϓ ίϯετϥΫλ OFX QSPUPUZQF B
N .Z OFX ίϯετϥΫλ ϓϩτλΠϓ Πϯελϯε ҕৡ QSPUPUZQF B $MBTT
w+BWBͰͷΫϥε ˒ςϯϓϨʔτ ˒ڇ ˒֓೦
w+BWBͰͷΫϥε ˒ςϯϓϨʔτ ˒ڇ ˒֓೦
ςϯϓϨʔτ ͨ͜ম͖ͷܕ ઃܭॻ ܗ Original Update by Will Scullin
Ϋϥεͬͯखஈʁ Original Update by Will Scullin
Original Update by Keith Williamson
Original Update by Keith rfranklinaz
ςϯϓϨʔτ ͨ͜ম͖ͷܕ ઃܭॻ ܗ Original Update by Will Scullin
Ϋϥεͬͯܕʁ Original Update by Will Scullin
Original Update by Leo-setä
var my = new My(1); my.m2 = function() { };
my.m2();
w+BWBͰͷΫϥε ˒ςϯϓϨʔτ ˒ڇ ˒֓೦
Original Update by admiller ݘ͕ϫϯϫϯ ڇ͕ϞʔϞʔ ೣ͕χϟʔ
Original Update by admiller Ϋϥεͬͯෆมʁ
$("#div_id") .toggleClass('oldClass newClass');
4* 3VCZJTU ͓̽͡͞ ߨࢣ ͓͞Μ /&8
ޱ࠲ Original Update by Dirk_Vorderstraße
var n = new Number(1); n instanceof Number; //=> true
n.__proto__ = String.prototype n instanceof Number; //=> false n instanceof String; //=> true
Original Update by admiller Ϋϥεͬͯ ඞਢʁ
ԿऀʹͳΕͳ͍ ΦϒδΣΫτ
Object.prototype instanceof Object; //=> false Object.create(null) instanceof Object; //=> false
w+BWBͰͷΫϥε ˒ςϯϓϨʔτ ˒ڇ ˒֓೦
Original Update by Keith jodelli ֓೦ͱ࣮ମ ΠσΞͱ࣮ࡏ ʮBQQMFʯͱʮBOBQQMFʯ
"QQMF OFX Ϋϥεఆٛ Πϯελϯε ιʔείʔυ ΠσΞ ϝϞϦ ݱ࣮ BQQMF
Apple? "QQMF OFX Ϋϥεఆٛ ΫϥεΦϒδΣΫτ Πϯελϯε DMBTT ιʔείʔυ ֓೦ ϝϞϦ
ݱ࣮ BQQMF
Apple? "QQMF OFX Ϋϥεఆٛ ΫϥεΦϒδΣΫτ Πϯελϯε DMBTT ιʔείʔυ ֓೦ ϝϞϦ
ݱ࣮ BQQMF $MBTT
N .Z OFX ίϯετϥΫλ ϓϩτλΠϓ Πϯελϯε ҕৡ QSPUPUZQF B $MBTT
N .Z OFX ίϯετϥΫλ ϓϩτλΠϓ Πϯελϯε ҕৡ QSPUPUZQF B
0CKFDU
0CKFDU $MBTT
Original Update by Keith Williamson
Original Update by Keith rfranklinaz
0CKFDU $MBTT
$("#div_id") .toggleClass('oldClass newClass');
&MFNFOU $MBTT
Apple? "QQMF OFX Ϋϥεఆٛ ΫϥεΦϒδΣΫτ Πϯελϯε DMBTT ιʔείʔυ ֓೦ ϝϞϦ
ݱ࣮ BQQMF
0CKFDU $MBTT
Original Update by Leo-setä
0CKFDUϓϩτλΠϓ 0CKFDUΠϯελϯε
var n = new Number(1); n instanceof Number; //=> true
n.__proto__ = String.prototype n instanceof Number; //=> false n instanceof String; //=> true
Object.prototype instanceof Object; //=> false Object.create(null) instanceof Object; //=> false
0CKFDUϓϩτλΠϓ ܧঝΦϒδΣΫτ .ZϓϩτλΠϓ
0CKFDUϓϩτλΠϓ 0CKFDUΠϯελϯε .ZϓϩτλΠϓ .ZΠϯελϯε
Object prototype prototype obj2 new MyClass my1 my2
.Z Ϋϥεఆٛ Πϯελϯε DMBTT ιʔείʔυ ֓೦ ϝϞϦ ݱ࣮ BQQMF 0CKFDU
Ϋϥεఆٛ DMBTT நઢ ܧঝઢ $MBTT$MBTT
N ҕৡઢ ϓϩτλΠϓ Πϯελϯε UP4USJOH ϓϩτλΠϓ B 'VODUJPOϓϩτλΠϓ .Z 0CKFDU
.Z Ϋϥεఆٛ Πϯελϯε DMBTT ιʔείʔυ ֓೦ ϝϞϦ ݱ࣮ BQQMF 0CKFDU
Ϋϥεఆٛ DMBTT நઢ ܧঝઢ $MBTT$MBTT
.Z Ϋϥεఆٛ Πϯελϯε DMBTT ιʔείʔυ ֓೦ ϝϞϦ ݱ࣮ BQQMF 0CKFDU
Ϋϥεఆٛ DMBTT நઢ ܧঝઢ $MBTT$MBTT
N ҕৡઢ ϓϩτλΠϓ Πϯελϯε UP4USJOH ϓϩτλΠϓ B 'VODUJPOϓϩτλΠϓ .Z 0CKFDU
N ҕৡઢ ϓϩτλΠϓ Πϯελϯε UP4USJOH ϓϩτλΠϓ B 'VODUJPOϓϩτλΠϓ .Z 0CKFDU
UIJTࢀর
function My(a) { this.a = a; } My.prototype = {
m1: function(b) { return this.a + b; } }; var my = new My(1); my.a; //=> 1 my.a = 2; my.m1(10); //=> 12
B N 0CKFDU
N B B N
N B B N
ؔ Ҿ ฦΓ ҾϦετ ؔຊମ
ؔ Ҿ ฦΓ UIJTҾ ڥ
a.b(); a.b<<a>>(); a.b.c(); a.b.c<<b>>();
function My(a) { this.a = a; } My.prototype = {
m1: function(b) { return this.a + b; } }; var my = new My(1); my.a; //=> 1 my.a = 2; my.m1<<my>>(10); //=> 12
ͲΜͳUIJTม͑Δ ࠷ڧͷໃ 'VODUJPODBMM
function func(b) { this.a; } func.call({a:1}, 10);
function func(b) { this.a; } func.call({a:1}, 10);
ͲΜͳࢦఆ͔ΒकΔ ࠷ڧͷ६ 'VODUJPOCJOE
function func(b) { this.a; } func.bind({a:1})(10);
function func(b) { this.a; } func.bind({a:1})(10);
function func(b) { this.a; } func.bind({a:1})(10);
func.bind({a:1}) .call({a:2}); ΄͜ʷͨͯ 'JHIU
function MyUI($el, a) { this.a = a; $el.click(this.m); } MyUI.prototype.m
= function(){ this.a };
function MyUI($el, a) { this.a = a; $el.click(this.m); } MyUI.prototype.m
= function(){ this.a };
function MyUI($el, a) { this.a = a; $el.click(this.m); } MyUI.prototype.m
= function(){ this.a };
function MyUI($el, a) { this.a = a; $el.click(this.m.bind(this)); } MyUI.prototype.m
= function(){ this.a };
ؔ Ҿ ฦΓ UIJTҾ ڥ UIJT
func.call(undefined); func.call(null); func.call(1); func.call(“a”); func.call(true);
function My(a) { this.a = a; } My.prototype = {
m1: function(b) { return this.a + b; } }; var my = new My(1); my.a; //=> 1 my.a = 2; my.m1(10); //=> 12
function My(a) { this.a = a; } My.prototype = {
m1: function(b) { return this.a + b; } }; var my = new My(1); my.a; //=> 1 my.a = 2; my.m1(10); //=> 12
function My(a) { this.a = a; } My.prototype = {
m1: function(b) { return this.a + b; } }; var my = new My(1); my.a; //=> 1 my.a = 2; my.m1(10); //=> 12
function My(a) { this.a = a; } My.prototype = {
m1: function(b) { return this.a + b; } }; var my = new My(1); my.a; //=> 1 my.a = 2; my.m1(10); //=> 12
function My(a) { this.a = a; } My.prototype = {
m1: function(b) { return this.a + b; } }; var my = new My(1); my.a; //=> 1 my.a = 2; my.m1(10); //=> 12
function My(a) { this.a = a; } My.prototype = {
m1: function(b) { return this.a + b; } }; var my = new My(1); my.a; //=> 1 my.a = 2; my.m1(10); //=> 12
એ
ϥϜμଜ
function a(func) { return func.call(this, 1); } a(function(b) { return
b + 10; }); //=> 11
function a(func) { return func.call(this, 1); } a(function(b) { return
b + 10; }); //=> 11
function a(func) { return func.call(this, 1); } a(function(b) { return
b + 10; }); //=> 11
function a() { return function() { return 1; }; }
var b = a(); b(); //=>1
(function(a) { return a + 10; })(1); //=> 11
func1 func2 4DPQF ؔ
func1 func2 func1 func2 4DPQF ؔ ؔ
ؔ Ҿ ฦΓ UIJTҾ ڥ UIJT
ؔ ڥΫϩʔδϟ
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
Ϋϥε Ϋϩʔδϟ ঢ়ଶ ෳ ෳ ৼΔ͍ ෳ Ұͭ
function sum(a, b) { return a + b; } var
left = 1; //.... var right = 2; sum(left, right);
function left(a) { return function(b) { return a + b;
}; } var right = left(1); //..... right(2);
MyUI.prototype.do_something = function() { var self = this; this.$el.click(function() {
$(this).val(self.a); }); }
MyUI.prototype.do_something = function() { var self = this; this.$el.click(function() {
$(this).val(self.a); }); }
var a = 1; function func(refA) { var a =
10; return refA(); } func(function() { return a; });
var a = 1; function func(refA) { var a =
10; return refA(); }; func(function() { return a; });
var a = 1; function func() { return a++; };
func(); func();
var a = 1; function func() { return a++; };
func(); func();
var a = 1; function func() { return a++; };
func(); func();
var a = 1; function func() { return a++; };
func(); func();
var a = 1; function func() { return a++; };
func(); func();
var a = 1; function func() { return a++; };
func(); func();
a=1 func
var a = 1; function func() { return a++; };
func(); func();
a=1 func
var a = 1; function func() { return a++; };
func(); func();
a=2 func
var a = 1; function func() { return a++; };
func(); func();
a=2 func
var a = 1; function func() { return a++; };
func(); func();
a=3 func
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
a=1 b,c func
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
a=1 b,c func a=10
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
a=1 b,c func a=10
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
a=1 b,c func a=10
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
a=1 b,c func a=12
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
a=1 b,c func a=12 a=10
var a = 1; function func() { var a =
10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
a=1 b,c func a=12 a=11
var a = 1; function func() { var a =
10; return new Function("", "return a++;") } var b = func(); b();
var a = 1; function func(refA) { var a =
10; return refA(); } func(function() { return a; });
var a = 1; function func(refA) { var a =
10; return refA(); } func(function() { return a; });
var a = 1; function func(refA) { var a =
10; return refA(); } func(function() { return a; });
a=1 func
var a = 1; function func(refA) { var a =
10; return refA(); } func(function() { return a; });
a=1 func refA a=10
var a = 1; function func(refA) { var a =
10; return refA(); } func(function() { return a; });
a=1 func refA a=10
var a = 1; function func(refA) { var a =
10; return refA(); } func(function() { return a; });
a=1 func refA a=10
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