Java エンジニアのためのJavaScript講座

JJUG Night Seminar. http://kokucheese.com/event/index/85227/

Transcript

1. ೥݄೔ !L[SJ ++6(
   φΠτɾηϛφʔ ʮ+BWBΤϯδχΞͷͨΊͷ+BWB4DSJQUߨ࠲ʯ ໊ࢺԦࠃͱͭͷଜͷ࿩
2. ઒৲߶ 4*԰
3. /&8
4. "MM
   ZPVS
   CBTF
   BSF
   CFMPOH
   UP
   VT
5. ετΞΞϓϦ
9. +BWB4DSJQU͸ ։ൃऀͷڞ௨ݴޠ΁
10. ΩʔϝοηʔδΛதԝʹදࣔ ϑΥϯτ ώϥΪϊ֯ΰ4UE/
    
    QU +BWB4DSJQUͷॻ੶ʹৄ͍͠ େ઒
    ઌੜ
    ૉࡐ ࠓ
11.               ࡭ ࡭ ࡭ ࡭ ࡭ ࡭ ࡭ ࡭ ࡭ ࡭ ࡭ ࡭ ࡭ ࡭
13. +BWBͷ ઓ࢜ 1SPHSBNNFS ຐ๏࢖͍
    )BDLFS ૐཿ 2"
14. ಈࢺଜ ໊ࢺଜ ϥϜμଜ
15. Ճ೤(ᣀ, 105); ଍͢_ϖΫνϯ(ᣀ); ࠞͥΔ(ϨϞϯ, ᣀ); ಈࢺଜ
16. ໊ࢺଜ new ು; ು.଍͢(ᣀ); ು.Ճ೤(105); ು.଍͢(ϖΫνϯ);
17. ϥϜμଜ $(ᣀ).Ճ೤(λ{ Թ౓ < 105 }).ࠞͥΔ(ϖΫνϯ, λ{ Ώͬ͘Γͱ }).ࠞͥΔ(...
18. ಈࢺଜ ໊ࢺଜ ϥϜμଜ
19. ຊ೔ͷΰʔϧ
20. wΞδΣϯμ w։ൃ؀ڥ wجຊ஋ͱΦϒδΣΫτ wධՁͱ࣮ߦ wϓϩτλΠϓνΣʔϯ wUIJTଋറ wείʔϓνΣʔϯ
21. ๯ݥͷ४උ
24. ຊؾʹͳͬͨΒ
31. ϞμϯΛࣹఔڑ཭ʹஔ͘
32. ಈࢺଜ
33. var a = 1; function func(b) { return a + b; } func(10); //=> 11
34. var a = 1; function func(b) { return a + b; } func(10); //=> 11 ม਺એݴ
35. var a = 1; function func(b) { return a + b; } func(10); //=> 11 ؔ਺એݴ
36. var a = 1; function func(b) { return a + b; } func(10); //=> 11 Ҿ਺ ฦΓ஋
37. var a = 1; function func(b) { return a + b; } func(10); //=> 11 ֎෦ม਺ͷࢀর
38. var a = 1; function func(b) { return a + b; } func(10); //=> 11 ؔ਺ݺͼग़͠
39. var a = 1; function func(b) { return a + b; } func(10); //=> 11 ࣝผࢠ
40. var a = 1; function func(b) { return a + b; } func(10); //=> 11 ਺஋
41. ϓϦϛςΟϒ஋ ͱ ΦϒδΣΫτ
42.  ͱ OFX
    /VNCFS 
43. B ͱ OFX
    4USJOH B
44. ۠ผͰ͖ͳ͍஋ ͱ ۠ผͰ͖Δ஋
45. 
    
     ͱ OFX
    /VNCFS 
     OFX
    /VNCFS 
46. ஋Λ౉͢஋ ͱ ࢀরΛ౉͢஋
47. WBS
    B
    
    C
    
     ͱ WBS
    B
    
    C
     OFX
    /VNCFS  
48. ୯Ұͷ஋ ͱ ঢ়ଶΛ࣋ͭ஋
49. var n = new Number(1); n["prop1"] = 1; n["prop1"]; //=> 1 n.prop2 = 2; n.prop2; //=>2 Ç QSPQ O  QSPQ 
50. ϓϦϛςΟϒ஋ ΦϒδΣΫτ ൺֱ ಉ஋ੑ ಉҰੑ ୅ೖ ஋ ࢀর ঢ়ଶͷอ࣋ ʷ ˓
51. wϓϦϛςΟϒ஋ ‣਺஋
    
    
    
    /B/ ‣จࣈྻ
    B
    BC
     ‣ਅِ஋
    USVF
    GBMTF ‣OVMM ‣VOEFpOFE
52. wΦϒδΣΫτ ‣0CKFDU ‣"SSBZ ‣/VNCFS ‣4USJOH ‣#PPMFBO ‣'VODUJPO
    ͳͲ
53. wΦϒδΣΫτ ‣0CKFDU ‣"SSBZ ‣/VNCFS ‣4USJOH ‣#PPMFBO ‣'VODUJPO
    ͳͲ
54. var obj = new Object; obj.a = 1; obj.a; //=> 1 var obj = { a: 1 }; obj.a; //=>1
55. var arr = new Array; arr[0] = 1; arr[0]; //=> 1 var arr = [1, 2]; arr[0]; //=> 1
56. var arr = [1, 2]; arr[100] = 3; arr.a = 1;  BSS      B 
57. wΦϒδΣΫτ ‣0CKFDU ‣"SSBZ ‣/VNCFS ‣4USJOH ‣#PPMFBO ‣'VODUJPO
    ͳͲ
58. new Number(1) + new Number(2); //=> 3
59. (1).a = 1; (1).a; //=> undefined; (new Number(1)).a = 1; (new Number(1)).a; //=> undefined
60. wΦϒδΣΫτ ‣0CKFDU ‣"SSBZ ‣/VNCFS ‣4USJOH ‣#PPMFBO ‣'VODUJPO
    ͳͲ
61. function a(){} var b = a; b(); var c = function() { }; c();
62. var obj = { m: function(a) { return a + 1; } }; obj.m(1); //=> 2
63. ධՁͱ࣮ߦ
64. var a, b = 1; a = 2; function c(d) { var e = 5; } c(2);
65. var a, b = 1; a = 2; function c(d) { var e = 5; } c(2);
66. a(); function a(){} b(); //ERROR var b = function(){};
67. TDSJQU IUNM
68. var a, b = 1; a = 2; function c(d) { var e = 5; } c(2);
69. var a = 1; function f1() { var b = 2; function f2() { var c = 3; }; }
70. if(false) { var a = 1; } for(var i=0; i<3; i++) { }
71. ໊ࢺଜ
72. 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
73. 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
74. 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
75. 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
76. 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
77. 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
78. 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
79. .Z OFX ίϯετϥΫλ Πϯελϯε B
80. 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
81. N .Z OFX ίϯετϥΫλ ϓϩτλΠϓ Πϯελϯε ҕৡ QSPUPUZQF B
82. 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 OFX
    0CKFDU
83. N .Z OFX ίϯετϥΫλ ϓϩτλΠϓ Πϯελϯε ҕৡ QSPUPUZQF UP4USJOH 0CKFDU ҕৡ ϓϩτλΠϓ ίϯετϥΫλ OFX QSPUPUZQF B
84. N .Z OFX ίϯετϥΫλ ϓϩτλΠϓ Πϯελϯε ҕৡ QSPUPUZQF B $MBTT
    
85. w+BWBͰͷΫϥε ˒ςϯϓϨʔτ ˒ڇ ˒֓೦
86. w+BWBͰͷΫϥε ˒ςϯϓϨʔτ ˒ڇ ˒֓೦
87. ςϯϓϨʔτ ͨ͜ম͖ͷܕ ઃܭॻ ਽ܗ Original Update by Will Scullin
88. Ϋϥεͬͯखஈʁ Original Update by Will Scullin
89. Original Update by Keith Williamson
90. Original Update by Keith rfranklinaz
91. ςϯϓϨʔτ ͨ͜ম͖ͷܕ ઃܭॻ ਽ܗ Original Update by Will Scullin
92. Ϋϥεͬͯܕʁ Original Update by Will Scullin
93. Original Update by Leo-setä
94. var my = new My(1); my.m2 = function() { }; my.m2();
95. w+BWBͰͷΫϥε ˒ςϯϓϨʔτ ˒ڇ ˒֓೦
96. Original Update by admiller ݘ͕ϫϯϫϯ ڇ͕ϞʔϞʔ ೣ͕χϟʔ
97. Original Update by admiller Ϋϥεͬͯෆมʁ
98. $("#div_id") .toggleClass('oldClass newClass');
99. 4*԰ 3VCZJTU ͓̽͡͞ ߨࢣ ͓෕͞Μ /&8
100. ޱ࠲ Original Update by Dirk_Vorderstraße
101. var n = new Number(1); n instanceof Number; //=> true n.__proto__ = String.prototype n instanceof Number; //=> false n instanceof String; //=> true
102. Original Update by admiller Ϋϥεͬͯ ඞਢʁ
103. Կऀʹ΋ͳΕͳ͍ ΦϒδΣΫτ
104. Object.prototype instanceof Object; //=> false Object.create(null) instanceof Object; //=> false
105. w+BWBͰͷΫϥε ˒ςϯϓϨʔτ ˒ڇ ˒֓೦
106. Original Update by Keith jodelli ֓೦ͱ࣮ମ ΠσΞͱ࣮ࡏ ʮBQQMFʯ
     ͱ
     ʮBO
     BQQMFʯ
107. "QQMF OFX Ϋϥεఆٛ Πϯελϯε ιʔείʔυ ΠσΞ ϝϞϦ ݱ࣮ BQQMF
108. Apple? "QQMF OFX Ϋϥεఆٛ ΫϥεΦϒδΣΫτ Πϯελϯε DMBTT ιʔείʔυ ֓೦ ϝϞϦ ݱ࣮ BQQMF
109. Apple? "QQMF OFX Ϋϥεఆٛ ΫϥεΦϒδΣΫτ Πϯελϯε DMBTT ιʔείʔυ ֓೦ ϝϞϦ ݱ࣮ BQQMF $MBTT
     
110. N .Z OFX ίϯετϥΫλ ϓϩτλΠϓ Πϯελϯε ҕৡ QSPUPUZQF B $MBTT
     
111. N .Z OFX ίϯετϥΫλ ϓϩτλΠϓ Πϯελϯε ҕৡ QSPUPUZQF B
112. 0CKFDU
113. 0CKFDU $MBTT
114. Original Update by Keith Williamson
115. Original Update by Keith rfranklinaz
116. 0CKFDU $MBTT
117. $("#div_id") .toggleClass('oldClass newClass');
118. &MFNFOU $MBTT
119. Apple? "QQMF OFX Ϋϥεఆٛ ΫϥεΦϒδΣΫτ Πϯελϯε DMBTT ιʔείʔυ ֓೦ ϝϞϦ ݱ࣮ BQQMF
120. 0CKFDU $MBTT
121. Original Update by Leo-setä
122. 0CKFDUϓϩτλΠϓ 0CKFDUΠϯελϯε
123. var n = new Number(1); n instanceof Number; //=> true n.__proto__ = String.prototype n instanceof Number; //=> false n instanceof String; //=> true
124. Object.prototype instanceof Object; //=> false Object.create(null) instanceof Object; //=> false
125. 0CKFDUϓϩτλΠϓ ܧঝΦϒδΣΫτ .ZϓϩτλΠϓ
126. 0CKFDUϓϩτλΠϓ 0CKFDUΠϯελϯε .ZϓϩτλΠϓ .ZΠϯελϯε
127. Object prototype prototype obj2 new MyClass my1 my2
128. .Z Ϋϥεఆٛ Πϯελϯε DMBTT ιʔείʔυ ֓೦ ϝϞϦ ݱ࣮ BQQMF 0CKFDU Ϋϥεఆٛ DMBTT ந৅ઢ ܧঝઢ $MBTT
     $MBTT
129. N ҕৡઢ ϓϩτλΠϓ Πϯελϯε UP4USJOH ϓϩτλΠϓ B 'VODUJPO
     ϓϩτλΠϓ .Z 0CKFDU
130. .Z Ϋϥεఆٛ Πϯελϯε DMBTT ιʔείʔυ ֓೦ ϝϞϦ ݱ࣮ BQQMF 0CKFDU Ϋϥεఆٛ DMBTT ந৅ઢ ܧঝઢ $MBTT
     $MBTT
131. .Z Ϋϥεఆٛ Πϯελϯε DMBTT ιʔείʔυ ֓೦ ϝϞϦ ݱ࣮ BQQMF 0CKFDU Ϋϥεఆٛ DMBTT ந৅ઢ ܧঝઢ $MBTT
     $MBTT
132. N ҕৡઢ ϓϩτλΠϓ Πϯελϯε UP4USJOH ϓϩτλΠϓ B 'VODUJPO
     ϓϩτλΠϓ .Z 0CKFDU
133. N ҕৡઢ ϓϩτλΠϓ Πϯελϯε UP4USJOH ϓϩτλΠϓ B 'VODUJPO
     ϓϩτλΠϓ .Z 0CKFDU
134. UIJTࢀর
135. 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
136. B  N 0CKFDU
137. N B  B  N
138. N B  B  N
139. ؔ਺ Ҿ਺ ฦΓ஋ Ҿ਺Ϧετ
     
     ؔ਺ຊମ
140. ؔ਺ Ҿ਺ ฦΓ஋ UIJTҾ਺ ؀ڥ
141. a.b(); a.b<<a>>(); a.b.c(); a.b.c<<b>>();
142. 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
143. ͲΜͳUIJT΋ม͑Δ ࠷ڧͷໃ 'VODUJPODBMM
144. function func(b) { this.a; } func.call({a:1}, 10);
145. function func(b) { this.a; } func.call({a:1}, 10);
146. ͲΜͳࢦఆ͔Β΋कΔ ࠷ڧͷ६ 'VODUJPOCJOE
147. function func(b) { this.a; } func.bind({a:1})(10);
148. function func(b) { this.a; } func.bind({a:1})(10);
149. function func(b) { this.a; } func.bind({a:1})(10);
150. func.bind({a:1}) .call({a:2}); ΄͜ʷͨͯ 'JHIU
151. function MyUI($el, a) { this.a = a; $el.click(this.m); } MyUI.prototype.m = function(){ this.a };
152. function MyUI($el, a) { this.a = a; $el.click(this.m); } MyUI.prototype.m = function(){ this.a };
153. function MyUI($el, a) { this.a = a; $el.click(this.m); } MyUI.prototype.m = function(){ this.a };
154. function MyUI($el, a) { this.a = a; $el.click(this.m.bind(this)); } MyUI.prototype.m = function(){ this.a };
155. ؔ਺ Ҿ਺ ฦΓ஋ UIJTҾ਺ ؀ڥ UIJT஋
156. func.call(undefined); func.call(null); func.call(1); func.call(“a”); func.call(true);
157. 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
158. 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
159. 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
160. 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
161. 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
162. 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
163. એ఻
164. ϥϜμଜ
165. function a(func) { return func.call(this, 1); } a(function(b) { return b + 10; }); //=> 11
166. function a(func) { return func.call(this, 1); } a(function(b) { return b + 10; }); //=> 11
167. function a(func) { return func.call(this, 1); } a(function(b) { return b + 10; }); //=> 11
168. function a() { return function() { return 1; }; } var b = a(); b(); //=>1
169. (function(a) { return a + 10; })(1); //=> 11
170. func1 func2 4DPQF ؔ਺
171. func1 func2 func1 func2 4DPQF ؔ਺ ؔ਺
172. ؔ਺ Ҿ਺ ฦΓ஋ UIJTҾ਺ ؀ڥ UIJT஋
173. ؔ਺
     
     ؀ڥ
     
     Ϋϩʔδϟ
174. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
175. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
176. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
177. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
178. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
179. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
180. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
181. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
182. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
183. Ϋϥε Ϋϩʔδϟ ঢ়ଶ ෳ਺ ෳ਺ ৼΔ෣͍ ෳ਺ Ұͭ
184. function sum(a, b) { return a + b; } var left = 1; //.... var right = 2; sum(left, right);
185. function left(a) { return function(b) { return a + b; }; } var right = left(1); //..... right(2);
186. MyUI.prototype.do_something = function() { var self = this; this.$el.click(function() { $(this).val(self.a); }); }
187. MyUI.prototype.do_something = function() { var self = this; this.$el.click(function() { $(this).val(self.a); }); }
188. var a = 1; function func(refA) { var a = 10; return refA(); } func(function() { return a; });
189. var a = 1; function func(refA) { var a = 10; return refA(); }; func(function() { return a; });
190. var a = 1; function func() { return a++; }; func(); func();
191. var a = 1; function func() { return a++; }; func(); func();
192. var a = 1; function func() { return a++; }; func(); func();
193. var a = 1; function func() { return a++; }; func(); func();
194. var a = 1; function func() { return a++; }; func(); func();
195. var a = 1; function func() { return a++; }; func(); func();
196. a=1 func
197. var a = 1; function func() { return a++; }; func(); func();
198. a=1 func
199. var a = 1; function func() { return a++; }; func(); func();
200. a=2 func
201. var a = 1; function func() { return a++; }; func(); func();
202. a=2 func
203. var a = 1; function func() { return a++; }; func(); func();
204. a=3 func
205. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
206. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
207. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
208. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
209. a=1 b,c func
210. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
211. a=1 b,c func a=10
212. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
213. a=1 b,c func a=10
214. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
215. a=1 b,c func a=10
216. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
217. a=1 b,c func a=12
218. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
219. a=1 b,c func a=12 a=10
220. var a = 1; function func() { var a = 10; return function() { return a++; }; } var b = func(); b(); //=> 10 b(); //=> 11 var c = func(); c(); //=> 10
221. a=1 b,c func a=12 a=11
222. var a = 1; function func() { var a = 10; return new Function("", "return a++;") } var b = func(); b();
223. var a = 1; function func(refA) { var a = 10; return refA(); } func(function() { return a; });
224. var a = 1; function func(refA) { var a = 10; return refA(); } func(function() { return a; });
225. var a = 1; function func(refA) { var a = 10; return refA(); } func(function() { return a; });
226. a=1 func
227. var a = 1; function func(refA) { var a = 10; return refA(); } func(function() { return a; });
228. a=1 func refA a=10
229. var a = 1; function func(refA) { var a = 10; return refA(); } func(function() { return a; });
230. a=1 func refA a=10
231. var a = 1; function func(refA) { var a = 10; return refA(); } func(function() { return a; });
232. a=1 func refA a=10
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240. ಈࢺଜ ໊ࢺଜ ϥϜμଜ
241. ͋Γ͕ͱ͏͍͟͝·ͨ͠