Javascript

{
    const str1 = "자바스크립트";
    const str2 = "제이쿼리";

    document.querySelector(".sample01_R1").innerHTML = str1 + str2;

    const num1 = "100";
    const num2 = "200";

    document.querySelector(".sample01_R2").innerHTML = num1 + num2;

    const txt1 = "모던";
    const txt2 = " 자바스크립트";
    const txt3 = "핵심";

    document.querySelector(".sample01_R3").innerHTML = "나는 " + txt1 + "(modern)" + txt2+"(javascript) " + txt3 + "을 배우고 싶다.";

    const tem1 = "모던";
    const tem2 = " 자바스크립트";
    const tem3 = "핵심";

    document.querySelector(".sample01_R4").innerHTML = `나는 ${tem1}(modern) ${tem2}(javascript) ${tem3}을 배우고 싶다.`;
}

{
    const str1 = "자바스크립트";
    const currentStr1 = str1.length;

    document.querySelector(".sample02_R1").innerHTML = currentStr1;

    const str2 = "javascript";
    const currentStr2 = str2.length;

    document.querySelector(".sample02_R2").innerHTML = currentStr2;
}

{
    const str1 = "javascript";
    const currentStr1 = str1.toUpperCase();

    document.querySelector(".sample03_R1").innerHTML = currentStr1;

    const str2 = "JAVASCRIPT";
    const currentStr2 = str2.toLowerCase();

    document.querySelector(".sample03_R2").innerHTML = currentStr2;
}

{
    const str1 = "   'javascript'   ";
    const currentStr1 = str1.trim();

    document.querySelector(".sample04_R1").innerHTML = currentStr1;
}

{
    const str = "자바스크립트(javascript) 공부";

    const text1 = str.indexOf('javascript');

    document.querySelector(".sample05_R1").innerHTML = text1;

    const text2 = str.indexOf('자바스크립트');

    document.querySelector(".sample05_R2").innerHTML = text2;

    const text3 = str.indexOf('제이쿼리');

    document.querySelector(".sample05_R3").innerHTML = text3;

    const text4 = str.indexOf('a');

    document.querySelector(".sample05_R4").innerHTML = text4;

    const text5 = str.lastIndexOf('a');

    document.querySelector(".sample05_R5").innerHTML = text5;

    const text6 = str.search(/javascript/);

    document.querySelector(".sample05_R6").innerHTML = text6;

    const text7 = str.search(/jquery/);

    document.querySelector(".sample05_R7").innerHTML = text7;

    const text8 = str.includes('javascript');

    document.querySelector(".sample05_R8").innerHTML = text8;

    const text9 = str.includes('jquery');

    document.querySelector(".sample05_R9").innerHTML = text9;

    const text10 = str.startsWith('자바스크립트');

    document.querySelector(".sample05_R10").innerHTML = text10;

    const text11 = str.endsWith('javascript');

    document.querySelector(".sample05_R11").innerHTML = text11;
}

{
    const str = "자바스크립트(javascript) 공부";
    const text = str.charAt(4);

    document.querySelector(".sample06_R1").innerHTML = text;

    const text2 = str.charAt();

    document.querySelector(".sample06_R2").innerHTML = text2;
}

{
    const str = "자바스크립트(javascript) 공부";
    const text = str.slice(1, 4);

    document.querySelector(".sample07_R1").innerHTML = text;

    const text2 = str.slice(1);

    document.querySelector(".sample07_R2").innerHTML = text2;

    const text3 = str.slice(3, -1);

    document.querySelector(".sample07_R3").innerHTML = text3;

    const text4 = str.slice(-14, -4);

    document.querySelector(".sample07_R4").innerHTML = text4;

    const text5 = str.slice(5, 1);

    document.querySelector(".sample07_R5").innerHTML = "실행 안됨";

    const text6 = str.substring(5, 1);

    document.querySelector(".sample07_R6").innerHTML = text6;

    const text7 = str.substr(4, 2);

    document.querySelector(".sample07_R7").innerHTML = text7;
}

{
    const str = "자바스크립트(javascript) 공부";
    const text = str.replace('공부', '스터디');

    document.querySelector(".sample08_R1").innerHTML = text;

    const str2 = "img01.jpg";
    const text2 = str2.replace('img01.jpg', 'img02.jpg');

    document.querySelector(".sample08_R2").innerHTML = text2;

    const str3 = "010-9312-9004";
    const text3 = str3.replace('-', '');

    document.querySelector(".sample08_R3").innerHTML = text3;

    const str4 = "010-9312-9004";
    const text4 = str4.replace(/-/g, '');

    document.querySelector(".sample08_R4").innerHTML = text4;

    const str5 = "010-9312-9004";
    const text5 = str5.replace(/-/g, ' ');

    document.querySelector(".sample08_R5").innerHTML = text5;
}

{
    const str = "자바스크립트(javascript) 공부";
    const text = str.split('');

    document.querySelector(".sample09_R1").innerHTML = text;

    const text2 = str.split(' ');

    document.querySelector(".sample09_R2").innerHTML = text2;

    const text3 = str.split('').join('/');

    document.querySelector(".sample09_R3").innerHTML = text3;

    const str4 = "https://webstory.co.kr/main.html?id=1234&name=webs";
    const text4 = str4.split('&');

    document.querySelector(".sample09_R4").innerHTML = text4;

    const str5 = "https://webstory.co.kr/main.html?id=1234&name=webs";
    const text5 = str5.split(/&|\?/);

    document.querySelector(".sample09_R5").innerHTML = text5;
}

{
    const num = "7";
    const text = num.padStart(2, '0');

    document.querySelector(".sample10_R1").innerHTML = text;

    const num2 = "456";
    const text2 = num2.padStart(6, '123');

    document.querySelector(".sample10_R2").innerHTML = text2;

    const num3 = "abc";
    const text3 = num3.padStart(3, '0');

    document.querySelector(".sample10_R3").innerHTML = text3;

    const num4 = "abc";
    const text4 = num4.padStart(6);

    document.querySelector(".sample10_R4").innerHTML = "<pre>" + text4 + "</pre>";

    const num5 = "7";
    const text5 = num5.padEnd(2, '0');

    document.querySelector(".sample10_R5").innerHTML = text5;

    const num6 = "456";
    const text6 = num6.padEnd(6, '123');

    document.querySelector(".sample10_R6").innerHTML = text6;

    const num7 = "abc";
    const text7 = num7.padEnd(3, '0');

    document.querySelector(".sample10_R7").innerHTML = text7;

    const num8 = "abc";
    const text8 = num8.padEnd(6);

    document.querySelector(".sample10_R8").innerHTML = "<pre>" + text8 + "</pre>";
}

{
    const text = "https://webstoryboy.co.kr/자바스크립트.html";
    const url = encodeURI(text);

    document.querySelector(".sample11_R1").innerHTML = url;
    
    const text2 = "https://webstoryboy.co.kr/자바스크립트.html";
    const url2 = encodeURIComponent(text2);
 
    document.querySelector(".sample11_R2").innerHTML = url2;
    
    const text3 = "https://webstoryboy.co.kr/%EC%9E%90%EB%B0%94%EC%8A%A4%ED%81%AC%EB%A6%BD%ED%8A%B8.html";
    const url3 = decodeURI(text3);

    document.querySelector(".sample11_R3").innerHTML = url3;
    
    const text4 = "https%3A%2F%2Fwebstoryboy.co.kr%2F%EC%9E%90%EB%B0%94%EC%8A%A4%ED%81%AC%EB%A6%BD%ED%8A%B8.html";
    const url4 = decodeURIComponent(text4);

    document.querySelector(".sample11_R4").innerHTML = url4;
}