2-01.String.html

<!DOCTYPE html>
<html>
<head>
  <title>Document</title>
</head>
<body>
  <script>
    var txt = "ABCDEFGHIJKLMN";
    console.log(txt.length); //글자길이

    //indexOf
    var str = "Please locate where 'locate'";
    console.log(str.indexOf("John"));

    if(str.indexOf("John") > -1) {
      console.log("locate문자 발견");
    }

    //lastIndexOf
    console.log(str.lastIndexOf("locate"));


    console.log(str.search("locate"));

    //slice
    var str = "Apple, Banana, Kiwi";
    // console.log(str.slice(7,13));
    // console.log(str.slice(7));
    // console.log(str.slice(-12,-6));

    //substring
    console.log(str.substring(7,13));

    //substr
    console.log(str.substr(7,6));

    var birthday = "970527";
    console.log(birthday.substr(0,2));
    console.log(birthday.substr(2,2));

    var birthday = "1997-05-27";
    console.log(birthday.substring(0,birthday.indexOf("-")));

    //repace
    // var str = "Please visit here!";
    // var str2 = str.replace("here","there");
    // console.log(str2);

    // var str = "Please visit here here here!";
    // var str2 = str.replace("here","there");
    // console.log(str2);

    var str = "Please visit here HERE here!";
    var str2 = str.replace(/here/gi,"there");
    console.log(str2);

    //uppercase
    console.log(str.toUpperCase());

    //lowercase
    console.log(str.toLowerCase());

    //john
    //JOHN
    //
    //데이터베이스 john, John

    //concat
    var txt1 = "Hello";
    var txt2 = "World";
    var txt3 = txt1 + " " + txt2;
    console.log(txt3);
    var txt4 = txt1.concat(" ",txt2);
    console.log(txt4);

    //trim
    var str = "    Hello World!      ";
    console.log(str);
    console.log(str.trim());

    //padStart
    var str = "15";
    console.log(str.padStart(2,0));

    //padEnd
    console.log(str.padEnd(4,0));

    //charAt
    var str = "Hello world";
    console.log(str.charAt(1));

    //split
    var tags = "키보드,기계식,블루투스";
    var arr = tags.split(",");
    console.log(arr);

    var birthday = "1997-06-12";
    var arr2 = birthday.split("-");
    console.log(arr2);


  </script>
</body>
</html>