markdown js_cc_02_cast

Posted 2021-05-06

    var bool = true; // 論理型
    var num = 1;     // 数値型
    
    if (bool == num) {
      document.write('<p>bool == num is true</p>');
    } else {
      document.write('<p>bool == num is false</p>');
    }
    
    document.write(bool + num); // =>2
    
    // 数値に変換
    document.write("<p>Number('123'): " + Number('123') + '</p>'); // 123
    document.write("<p>Number(true): " + Number(true) + '</p>'); // 1
    
    //文字列に変換
    document.write("<p>String(123): " + String(123) + '</p>'); // 123
    document.write("<p>String(true): " + String(true) + '</p>'); // 'true'
    
    
    document.write("<p>String(100 + '100'): " + String(100 + '100') + '</p>'); // 100000
    document.write("<p>String(100 + Number('100')): " + String(100 + Number('100')) + '</p>'); // 200

js_cc_02_cast
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