我如何得到结果，比较越来越小答案

【问题标题】：How do I get the result, the comparison is bigger and smaller我如何得到结果，比较越来越小
【发布时间】：2020-12-29 20:09:06
【问题描述】：

我想在给定一定值时根据尺寸调整视频质量

<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>

【问题讨论】：

你想要age<=720 => SD, 720<age<=1080 => HD and 1080<age => FD?

标签： javascript html comparison vote

【解决方案1】：

试试这个！

    <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>

【讨论】：