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HTML│CSS│Java Script

자바 스크립트 배열

by 자유코딩 2017. 12. 5.

html은 문서를 순서대로 읽지 않고 한번에 코드를 읽고 변수를 할당한 다음

prompt 와 같이 사용자의 입력을 받는 부분을 먼저 실행한다

 

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>while</title>
<script type="text/javascript">
    //자바 배열 : 하나의 이름 같은 자료형의 여러개 데이터의 묶음
    //자바 스크립트 배열 : 하나의 이름에 여러 자료형의 데이터의 여러개의 데이터 묶음(자료형 상관 없음)
    //자바 스크립트 배열 생성, 배열도 변수에 저장 가능
    
    var arr=new Array();
    arr[0= 10;
    arr[1= 3.14;
    arr[2= true;
    arr[3= "html";
    arr[4= 'A';
    arr[5= null;
    
    //배열 출력 => for문
    for (var i = 0; i < arr.length; i++) {
        document.write(arr[i]+"<br/>");
    }
    document.write("<hr/>");
    
    var arr2=["김html",20,175,"서울",'C'];
    
    //개선된 for문
    for ( var k in arr2) {
        document.write(arr2[k]+"<br/>");
    }
    document.write("<hr/>");
    
    //맵 , json , 객체 형식
    var arr3={
            make:"Benz",
            model:"sClass",
            year:2018,
            money:"3억"
    }
    for ( var k in arr3) {
        document.write(arr3[k]+"<br/>");        
    }
    
    document.write("<hr/>");
    document.write(arr[3]);
    document.write("<hr/>");
    document.write(arr2[0]);
    document.write("<hr/>");
    document.write(arr3.model);
    document.write("<hr/>");
    document.write(arr3["make"]);
 
</script>
</head>
<body>
 
</body>
</html>
cs

 

 

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>함수 : function</title>
    <script type="text/javascript">
        //function = 함수, 자바에서는 메소드
        // 재사용,
        var num=10;
        document.write("1 : "+num);
        /*함수 생성*/
        /* function test() {
            document.write(" * : "+sum);
        } */
    </script>
<script type="text/javascript">
    function test() {
        document.write(" * : "+sum);
    }
 
</script>
</head>
<body onload="test()">
    <!-- 태그 속성 중 onXXXX는 무조건 자바 스크립트 함수 호출 -->
    <!--<body onload="test()"> body를 읽고 난 후 
        자바 스크립트 test함수 호출 -->
    <script type="text/javascript">
        document.write("2 : "+num);
    </script>
    <h2>hi</h2>
    <script type="text/javascript">
        document.write("3 : "+num);
    </script>
 
</body>
</html>
cs

 

 

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>function</title>
<script type="text/javascript">
    function test() {
        document.write("test() 함수 호출 성공");
    }
</script>
</head>
<body>
    <h2 align="center">function 연습</h2>
    <!-- 버튼을 누르면 test()호출 -->
    <button onclick="test()">함수 호출</button>
    
</body>
</html>
cs

 

 

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
    //선언 함수는 먼저 호출 가능하다
    
    test();
    //선언 함수
    function test() {
        document.write("Hi");
    }
    function test() {
        document.write("Hello");
    } 
    test();
</script>
<script type="text/javascript">
    //익명 함수
    //익명 함수는 먼저 만들어지지 않는다
    //선언 위에 호출하면 오류 발생
    var msg = function() {
        document.write("Hi2");        
    }
    msg();
    var msg = function() {
        document.write("Hello2");        
    }
</script>
<script type="text/javascript">
    function test2() {
        document.write("Hi3");        
    }
    var test2 = function {
        document.write("Hello 3");
    }
    test2();
</script>
 
<script type="text/javascript">
    var test3 = function {
        document.write("Hello 4");
    }
    function test3() {
        document.write("Hi4");        
    }
    test3();
</script>
 
<script type="text/javascript">
    test4();
    function test4() {
        document.write("Hi5");        
    }
    var test4 = function {
        document.write("Hello 5");
    }
</script>
 
<script type="text/javascript">
    test5();
    var test5 = function {
        document.write("Hello 6");
    }
    function test5() {
        document.write("Hi6");        
    }
</script>
 
</head>
<body>
</body>
</html>
cs

 

 

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>function</title>
<script type="text/javascript">
    var num=100;
    function add(a,b) {
        document.write("결과 : "+(a+b)+"<br/>");
    }
    function sub(a,b){
        return a-b;
    }
</script>
</head>
<body>
    <h2>
        <script type="text/javascript">
            document.write("num = "+num+"<br/>");
            add(100,200);
            add("문자1 ","문자 2");
            add("100 ",100);
            
            var k = sub(3000,2000);
            document.write("k = "+k);
        
        </script>
    </h2>
</body>
</html>
cs

 

 

 

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>function: 페이지 이동 , 리 다이렉트 , 포워딩</title>
<script type="text/javascript">
    function test(){
        location.href="http://www.naver.com";
    }
    function test2(){
        //새로운 윈도우 창 열기 open
        open(page,"width=400,height=400");
    }
</script>
</head>
<body>
    <input type="button" value="이동" onclick="test()"/>
    <input type="button" value="이동2" onclick="javascript:location.href='http://fors.tistory.com'"/>
    <button onclick="test2('ex01.html')">이동 3</button>
</body>
</html>
cs

 

 

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>function id 선택지</title>
<!--id 선택자는 중복 할 수 없다. id 해당 태그를 지정하는 역할-->
<script type="text/javascript">
    function test1() {
        //해당 아이디를 가지고 있는 태그를 찾아서 문자를 삽입
        document.getElementById("demo").innerHTML="Id 선택자를 사용해서 글자 삽입 - test1"    
    }
    //태그의 속성 변경(스타일 지정)
    function test2() {
        //해당 아이디를 가지고 있는 태그를 찾아서 문자를 삽입
        document.getElementById("demo2").style.display="none";
    }
    function test3() {
        //해당 아이디를 가지고 있는 태그를 찾아서 문자를 삽입
        document.getElementById("demo3").style.fontSize="35px";    
    }
</script>
</head>
<body>
    <h2>id 선택지</h2>
    <p id="demo">demo</p>
    <p id="demo2">demo 2</p>
    <p id="demo3">demo 3</p>
    <button onclick="test1()">클릭</button>
    <button onclick="test2()">클릭</button>
    <button onclick="test3()">클릭</button>
</body>
</html>
cs

 

 

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
    function setRed() {
        var box = document.getElementById("box");
        box.style.background="red";
    }
    function setGreen() {
        box.style.background="green";
    }
    function setBlue() {
        box.style.background="blue";
    }
 
</script>
 
</head>
<body>
    <button onclick="setRed()">RED</button>
    <button onclick="setGreen()">GREEN</button>
    <button onclick="setBlue()">BLUE</button>
    
    <div id="box" style="border:1px solid black;
        background-color:#ffffff;width:200px;height=200px;">box1
    </div>
    
</body>
</html>
cs

 

 

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>function : id 선택자</title>
<script type="text/javascript">
    function setRed(){
        var box1 = document.getElementById("box1");    
        var box2 = document.getElementById("box2");    
        var box3 = document.getElementById("box3");
        box1.style.display="block";
        box2.style.display="none";
        box3.style.display="none";
    }
    function setGreen(){
        box1.style.display="none";
        box2.style.display="block";
        box3.style.display="none";
    }
    function setBlue(){
        box1.style.display="none";
        box2.style.display="none";
        box3.style.display="block";
    }
</script>
</head>
<body>
    <button onclick="setRed()">RED</button>
    <button onclick="setGreen()">GREEN</button>
    <button onclick="setBlue()">BLUE</button>
 
    <div id="box1" style="border:1px solid black;display:none;
    background-color:#ff0000;width:200px;height:200px;">box1
    </div>
    
    <div id="box2" style="border:1px solid black;display:none;
    background-color:#00ff00;width:200px;height:200px;">box2
    </div>
    
    <div id="box3" style="border:1px solid black;display:none;
    background-color:#0000ff;width:200px;height:200px;">box3
    </div>
 
</body>
</html>
cs

 

 

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>function : id선택자</title>
<script type="text/javascript">
    function test1() {
        var img = document.getElementById("myimg");
        img.src="img/turnon.gif";
    }
    function test2() {
        var img = document.getElementById("myimg");
        img.src="img/turnoff.gif";
    }
</script>
</head>
<body>
    <button onclick="test1()">불 꺼기</button>
    <img id="myimg" src="img/turnoff.gif">
    <button onclick="test2()">불 끄기</button>
</body>
</html>
cs

 

 

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>계산기</title>
<script type="text/javascript">
    function calc_go() {
        //value 무조건 문자
        //숫자로 변경할때 parseInt()
        var num1 = document.getElementById("num1").value;
        var num2 = document.getElementById("num2").value;
        var sum = parseInt(num1)+parseInt(num2);
        document.getElementById("res").innerHTML=sum;    
    }
</script>
</head>
<body>
    <h2>덧셈 계산기</h2>
    <form>
        <p>첫번째 수 : <input type="number" id="num1" name="num1"></p>
        <p>두번째 수 : <input type="number" id="num2" name="num2"></p>
        <input type ="button" value="계산" onclick="calc_go()"/>
        <hr/>
        <h3>결과 :<span id="res"></span></h3>
    </form>
</body>
</html>
cs

 

 

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