我如何得到結果，比較越來越小

Question

我想在給定某個值時根據尺寸調整視頻質量

 <input id="age" value="500" /> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var age,en, voteable; age = document.getElementById("age").value; voteable = (720 > age < 1080 ) ? "SD":"HD":"FHD"; document.getElementById("demo").innerHTML = " Quality:" + voteable ; } </script>

Answer 1

嘗試這個！

    <input id="age" value="500" />

<button onclick="test()">Try it</button>

<p id="demo"></p>
<script>
    function test() {
        var age = document.getElementById("age").value;
        if (1080<=age) {
        document.getElementById("demo").innerHTML = "Quality: FHD";
        }
        else if (720<=age) {
        document.getElementById("demo").innerHTML = "Quality: HD";
        }
        else if (age<720) {
            document.getElementById("demo").innerHTML = "Quality: SD";
        }
    }
    </script>