markdown js_cc_01_type

Posted 2021-05-06

    var sum;
    var num = 1; //数値型
    var str = '1'; //文字列型
    // 数値型(1) + 数値型(1)
    sum = num + num;
    document.write("<p>1 + 1 = " + sum + "</p>");
    // 文字列型('1') + 文字列型('1')
    sum = str + str;
    document.write("<p>'1' + '1' =" + sum  + "</p>");
    // 数値型(1) + 文字列型('1')
    sum = num + str;
    document.write("<p>1 + '1' = " + sum + "</p>");
    // 論理型
    var  flag;
    flag = true; // 真
    document.write("<p>true => " + flag + "</p>");
    flag = false; // 偽
    document.write("<p>false => " + flag + "</p>");
    // null型
    var nothing = null; //null型
    document.write("<p>null => " + nothing + "</p>");
    // undefined型
    var undef;
    document.write(undef); // undefined

js_cc_type
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A [Pen](https://codepen.io/m-shinkawa/pen/XYbbRB) by [m-shinkawa](https://codepen.io/m-shinkawa) on [CodePen](https://codepen.io).

[License](https://codepen.io/m-shinkawa/pen/XYbbRB/license).

js_cc_01_type
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A [Pen](https://codepen.io/m-shinkawa/pen/XYbbRB) by [m-shinkawa](https://codepen.io/m-shinkawa) on [CodePen](https://codepen.io).

[License](https://codepen.io/m-shinkawa/pen/XYbbRB/license).