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[WEB UI BASIC] JavaScript 1탄
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WEB UI BASIC JavaScript 기초입니다! JavaScript의 소개 및 역할, 변수, operator로 가볍게 구성했습니다.
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[WEB UI BASIC] JavaScript 1탄
1.
Javascript
2.
1탄 WEB UI BASIC 본
자료는 NHN NEXT 윤지수 교수님의 자료를 바탕으로 제작했습니다. NHN
3.
NEXT
4.
우재우
5.
아기다리
6.
고기다리던
7.
Javascript를
8.
배워봅시다!
9.
오늘은
10.
기본만
11.
쉽게
12.
해보죠
13.
14.
일단
15.
Javascript는
16.
Java와
17.
관계가
18.
없어요ㅠ
19.
(근데
20.
자바지기는
21.
JS(재성)입니다ㅋㅋㅋ)
22.
쉽게
23.
공부하려면
24.
쉽고,
25.
어렵게
26.
공부하려면
27.
끝도
28.
없어요ㅋ
29.
JS는
30.
컴파일
31.
언어가
32.
아닙니다!
33.
파이썬
34.
같은
35.
인터프리터
36.
언어입니다~
37.
그래서
38.
짜봐(Java)스크립트죠ㅋ
39.
DOM(document
40.
object
41.
model)이라는게
42.
있어요 HTML이
43.
tree
44.
구조로
45.
만들어진다고
46.
전에
47.
말씀
48.
드린거
49.
기억나나요?
50.
element
51.
하나하나가
52.
tree의
53.
node가
54.
되고,
55.
그
56.
node를
57.
쉽게
58.
찾을
59.
수
60.
있는
61.
API가
62.
DOM입니다!!! 출처:
63.
http://www.w3schools.com/js/js_htmldom.asp
64.
그래서
65.
JS가
66.
하는
67.
일은!!! HTML의
68.
구조를
69.
조작합니다.(DOM
70.
변경)
71.
CSS를
72.
동적으로
73.
변경합니다.
74.
사용자가
75.
키보드/마우스
76.
이벤트를
77.
발생하면
78.
처리해줍니다.
79.
클라이언트
80.
측
81.
데이터를
82.
변경/검증
83.
할
84.
수
85.
있습니다.
86.
서버에
87.
요청을
88.
보내고
89.
받아서
90.
처리할
91.
수
92.
있습니다.
93.
아,
94.
심지어
95.
서버도
96.
만들
97.
수
98.
있어요!!!
99.
(Node.js)
100.
Javascript
101.
맛보기 개발자
102.
도구에서
103.
console
104.
탭에
105.
바로
106.
코드를
107.
쓸
108.
수
109.
있어요!
110.
alert(“hello”);를
111.
써봅시다! 줄바꿈은
112.
shift
113.
+
114.
enter
115.
Javascript를
116.
적용하는
117.
법
118.
1 html
119.
script라는
120.
태그에
121.
JS코드를
122.
바로
123.
씁니다!
124.
script
125.
alert(“Hello,
126.
world!”);
127.
/script -
128.
internal
129.
방식 [참고]
130.
HTML4에서는
131.
script
132.
type=‘text/javascript’
133.
라고
134.
써주는데
135.
HTML5부터는
136.
script만
137.
써도
138.
됩니다.
139.
Javascript를
140.
적용하는
141.
법
142.
2 js파일을
143.
따로
144.
작성한
145.
뒤
146.
css
147.
external처럼
148.
불러옵니다.
149.
[test.js]
150.
alert(“Hello,
151.
world!”);
152.
script
153.
src=‘test.js’/script -
154.
external
155.
방식
156.
script의
157.
위치는
158.
어디가
159.
좋을까? !DOCTYPE
160.
html
161.
html
162.
head
163.
여기?
164.
/head
165.
body
166.
여기?
167.
코드들...
168.
여기?
169.
/body
170.
/html 제가
171.
좋아하는
172.
www.html5doctor.com에서
173.
실제로
174.
어디있는지
175.
살펴봅시다!
176.
왜
177.
하필
178.
거기죠?? 우리가
179.
보는
180.
웹페이지는
181.
싱글뜨레드로
182.
돌아갑니다!
183.
쉽게
184.
말해서
185.
뭐
186.
하나
187.
하면
188.
딴짓
189.
못하는
190.
스타일
191.
그래서
192.
브라우져가
193.
JS를
194.
읽는
195.
동안은
196.
다른
197.
일
198.
못
199.
합니다ㅠ
200.
JS가
201.
뒤에
202.
있으면
203.
HTML,
204.
CSS
205.
다
206.
그리고
207.
나서
208.
다운받고
209.
읽겠죠?
210.
사용자
211.
입장에서
212.
생각해보면
213.
흰화면에서
214.
기다리는
215.
것보다는
216.
뭐라도
217.
먼저
218.
살짝
219.
보이는게
220.
반응속도가
221.
빨라
222.
보이겠죠?
223.
위치를
224.
꼭,
225.
반드시,
226.
머스트
227.
지키지는
228.
않아도
229.
됩니다만
230.
한
231.
번쯤은
232.
구글에서
233.
이
234.
이슈에
235.
대해
236.
검색해
237.
보시길...
238.
JS
239.
Data
240.
type Number
241.
String
242.
Boolean
243.
Array
244.
Object var
245.
var는
246.
척하면
247.
척척척! var
248.
num
249.
=
250.
3;
251.
var
252.
str
253.
=
254.
“hello”;
255.
var
256.
bool
257.
=
258.
true;
259.
var
260.
arr
261.
=
262.
[1,
263.
2,
264.
“3”];
265.
var
266.
obj
267.
=
268.
{“Hello”:
269.
“Hi”,
270.
“Bye”:”See
271.
you
272.
soon”};
273.
심지어
274.
var를
275.
안
276.
써도
277.
된다?! test
278.
=
279.
3;
280.
이라고
281.
쓰시고,
282.
그냥
283.
test;를
284.
입력해봅시다!
285.
type에
286.
엄격한
287.
언어들(예를
288.
들면
289.
C)을
290.
쓰다가
291.
JS를
292.
보면
293.
이게
294.
뭔가
295.
싶습니다
296.
ㅋㅋㅋ
297.
printf();
298.
=
299.
console.log();
300.
넌
301.
type이
302.
뭐니? 변수의
303.
타입이
304.
궁금할
305.
땐
306.
typeof!
307.
Dynamic
308.
typing var
309.
a;
310.
console.log('typeof
311.
a
312.
is
313.
now,'+
314.
typeof(a));
315.
a
316.
=
317.
null;
318.
console.log('typeof
319.
a
320.
is
321.
now,'+
322.
typeof(a));
323.
a
324.
=
325.
1;
326.
console.log('typeof
327.
a
328.
is
329.
now,'+
330.
typeof(a));
331.
a
332.
=
333.
string;
334.
console.log('typeof
335.
a
336.
is
337.
now,'+
338.
typeof(a));
339.
a
340.
=
341.
false;
342.
console.log('typeof
343.
a
344.
is
345.
now,'+
346.
typeof(a));
347.
a
348.
=
349.
[];
350.
console.log('typeof
351.
a
352.
is
353.
now,'+
354.
typeof(a));
355.
a
356.
=
357.
{};
358.
console.log('typeof
359.
a
360.
is
361.
now,'+
362.
typeof(a));
363.
이거
364.
허용해도
365.
되는
366.
건가요? 다음
367.
값들이
368.
어떻게
369.
나오는지
370.
예상해봅시다.
371.
var
372.
result;
373.
result
374.
=
375.
30
376.
+
377.
30;
378.
result
379.
=
380.
“result
381.
is”
382.
+
383.
30;
384.
result
385.
=
386.
“30”
387.
-
388.
3;
389.
result
390.
=
391.
“30”
392.
*
393.
3;
394.
result
395.
=
396.
-“30”;
397.
result
398.
=
399.
“What
400.
is
401.
this?”
402.
-
403.
30;
404.
진짜
405.
어처구니가
406.
없죠?
407.
ㅋㅋㅋ
408.
난
409.
NaN이야... NaN은
410.
Not
411.
a
412.
Number
413.
입니다.
414.
대개
415.
말도
416.
안
417.
되는
418.
숫자
419.
연산의
420.
결과값으로
421.
쓰입니다.
422.
예를
423.
들면
424.
“hello”
425.
-
426.
30
427.
1
428.
/
429.
“smith”
430.
NaN
431.
==
432.
NaN
433.
1
434.
/
435.
0
436.
437.
—-
438.
439.
얘는
440.
뭐가
441.
나올까요???
442.
443.
내가
444.
없는게
445.
없는게
446.
아니야 undefined
447.
vs
448.
null
449.
undefined
450.
vs
451.
null var
452.
a;
453.
a; 개발자도구
454.
콘솔창에서
455.
아래
456.
코드를
457.
입력해
458.
봅시다! var
459.
b
460.
=
461.
null;
462.
b;
463.
undefined는
464.
변수를
465.
선언만
466.
했지
467.
자료형이
468.
결정되지
469.
않은
470.
상태! null은
471.
선언된
472.
변수에
473.
null이라는
474.
빈값이
475.
들어간
476.
경우! undefined
477.
vs
478.
null
479.
여기서
480.
잠깐
481.
쉬는
482.
시간
483.
ㅋ
484.
a
485.
=
486.
a
487.
+
488.
3;
489.
490.
491.
492.
493.
494.
495.
—-
496.
497.
498.
499.
500.
501.
502.
503.
a
504.
+=
505.
3;
506.
a
507.
=
508.
a
509.
-
510.
3;
511.
512.
513.
514.
515.
516.
517.
—-
518.
519.
520.
521.
522.
523.
524.
525.
a
526.
-=
527.
3;
528.
a
529.
=
530.
a
531.
*
532.
3;
533.
534.
535.
536.
537.
538.
539.
—-
540.
541.
542.
543.
544.
545.
546.
547.
a
548.
*=
549.
3;
550.
a
551.
=
552.
a
553.
/
554.
3;
555.
556.
557.
558.
559.
560.
561.
—-
562.
563.
564.
565.
566.
567.
568.
569.
a
570.
/=
571.
3;
572.
a
573.
=
574.
a
575.
%
576.
3;
577.
578.
579.
580.
581.
582.
583.
—-
584.
585.
586.
587.
588.
589.
590.
591.
a
592.
%=
593.
3; Operators
594.
#1:
595.
Assignment
596.
operators
597.
var
598.
a
599.
=
600.
3;
601.
a++;
602.
a—;
603.
var
604.
b
605.
=
606.
false;
607.
b++; Operators
608.
#2:
609.
Arithmetic
610.
operators
611.
15
612.
613.
9
614.
615.
9
616.
15
617.
|
618.
9
619.
620.
15
621.
9
622.
623.
2
624.
625.
36 Operators
626.
#3:
627.
Bitwise
628.
operators //
629.
1111
630.
631.
1001
632.
=
633.
1001
634.
//
635.
1111
636.
|
637.
1001
638.
=
639.
1111
640.
//
641.
1001
642.
643.
644.
—-
645.
646.
647.
100100
648.
true
649.
650.
true;
651.
“hello”
652.
||
653.
false; Operators
654.
#4:
655.
Logical
656.
operators
657.
“30”
658.
==
659.
30;
660.
true
661.
==
662.
“1”;
663.
100
664.
=
665.
99;
666.
100
667.
=
668.
99;
669.
여기까지는
670.
다른
671.
언어랑
672.
다를게
673.
없군! Operators
674.
#5:
675.
Comparison
676.
operators
677.
그런데!
678.
JS에는
679.
==
680.
말고도
681.
===이
682.
있다!!!
683.
“30”
684.
===
685.
30;
686.
true
687.
===
688.
“1”;
689.
null
690.
==
691.
undefined;
692.
null
693.
===
694.
undefined; Operators
695.
#5:
696.
Comparison
697.
operators
698.
===은
699.
정확한
700.
타입
701.
비교까지
702.
가능!
703.
결론적으로
704.
JS
705.
타입
706.
비교에서는
707.
===이
708.
안전하겠죠?
709.
:)
710.
var height =
“182cm”; var nHeight = parseInt(height); var handSome = (nHeight 180) ? true : false; console.log(handSome); // ? Operators
711.
#6:
712.
Conditional
713.
operators
714.
var
715.
a
716.
=
717.
10;
718.
if
719.
(a
720.
==
721.
9)
722.
{
723.
a++;
724.
}
725.
else
726.
if
727.
(a
728.
==
729.
10)
730.
{
731.
a—;
732.
}
733.
else
734.
{
735.
a
736.
=
737.
“Error”;
738.
}
739.
console.log(a); if문 우리가
740.
알던
741.
그
742.
if가
743.
맞습니다!
744.
var
745.
result
746.
=
747.
0;
748.
for
749.
(var
750.
i
751.
=
752.
1;
753.
i
754.
=
755.
10;
756.
i++)
757.
{
758.
result
759.
+=
760.
i;
761.
}
762.
console.log(result); for문
763.
while,
764.
do
765.
while,
766.
break,
767.
continue,
768.
switch
769.
등
770.
원래
771.
알던
772.
것들
773.
거의
774.
똑같이
775.
작동해요~
776.
자세한
777.
것은
778.
각자
779.
검색해서
780.
공부하는
781.
걸로...
782.
다음
783.
배열에서
784.
짝수의
785.
개수가
786.
몇
787.
개인지
788.
출력하세요!
789.
for를
790.
이용하며,
791.
문자열이
792.
나오면
793.
loop를
794.
탈출합니다.
795.
(참고:
796.
Array에는
797.
length
798.
property가
799.
있어요
800.
==
801.
arr.length) 미션!!! var
802.
arr
803.
=
804.
[1,
805.
2,
806.
3,
807.
4,
808.
23,
809.
43,
810.
57,
811.
100,
812.
“333”,
813.
10];
814.
우리는
815.
JS맛만
816.
봤다!!!
817.
겸손해야
818.
합니다
819.
ㅠ
820.
아직
821.
갈
822.
길이
823.
구만구천구십구리
824.
이번
825.
주는
826.
딱히
827.
대단한
828.
숙제가
829.
없어요!!!
830.
신나죠?!?!
831.
GOOD
832.
프로젝트
833.
계속
834.
발전시킵시다ㅎ
835.
다음
836.
주도
837.
JS
838.
계속!!!
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