我如何使这段代码给出预期的结果

Question

function myfun(){   //var yofad = document.getElementById('age').value;   var yoad;   var year = 2014 ;     if( year >= 2014){        yoad = "Your certicate is ready go to school portal";      } else if (year == 2019){        yoad = "Your certificate is in progress";      } else {        yoad = "cert not found";      }document.getElementById('cc').innerHTML=yoad}<h6>Enter your year of admission to know if your certificate is ready</h6><input id="age"><button onclick="myfun()">enter</button><p id="xc"></p><p id="cc"></p>当输入介于 2014 和 2019 之间时，我希望输出为“您的证书已准备好去学校门户网站”，当输入高于 2019 时，输出应为 cert is not read

Answer 1

只需使用并操作它会帮助您检查 2 个条件

function myfun(){

   //var yofad = document.getElementById('age').value;

   var yoad;

   var year = 2014 ;

     if( year >= 2014 && year <2019){

        yoad = "Your certicate is ready go to school portal";

      }else if (year == 2019){

       yoad = "Your certificate is in progress";

      } else {

        yoad = "cert not found";

      }

document.getElementById('cc').innerHTML=yoad

}

Answer 2

将您的第一个条件限制为小于 2019，否则对于 2019、2020 和其他更大的值也将成立。改为if(year >= 14)_if(year >= 14 && year <2019)

function myfun(){

   var year = document.getElementById('age').value;

   var yoad;

     if( year >= 2014 && year < 2019){

        yoad = "Your certicate is ready go to school portal";

      } else if (year == 2019){

        yoad = "Your certificate is in progress";

      } else {

        yoad = "cert not found";

      }

document.getElementById('cc').innerHTML=yoad

}

<h6>Enter your year of admission to know if your certificate is ready</h6>

<input id="age">

<button onclick="myfun()">enter</button>

<p id="xc"></p>

<p id="cc"></p>

Answer 3

function myfun(){

  document.getElementById('cc').innerHTML = "";

  const value = document.getElementById('age').value;

  if (!value) return;

  

  const year = parseInt(value);

  let yoad;

  

  if (year > 2019) {

    yoad = "certicate not read";

  } else if (year >= 2014 && year <= 2019) {

    yoad = "Your certicate is ready go to school portal";

  } else {

    yoad = "cert not found";

  }

  

  document.getElementById('cc').innerHTML = yoad

}

<h6>Enter your year of admission to know if your certificate is ready</h6>

<input id="age">

<button onclick="myfun()">enter</button>

<p id="xc"></p>

<p id="cc"></p>

也许你需要这样的东西！