关于angular应用中typescript规则的问题答案

【问题标题】：Questions about typescipt rules in angular application关于angular应用中typescript规则的问题
【发布时间】：2022-11-15 17:14:13
【问题描述】：

我对角度的打字稿代码规则有一些疑问。

1：初始化变量有几种定义变量的可能性，但是用角度初始化变量不是必需的吗？因为我可以使用？没有初始化。

public variable?;
public variable = "string";

我只想知道，哪个更好？

2：在html中使用方法调用的好方法吗如

<componentName [clu] = getClu()>

<componentName>

或者我在ts文件中定义了一个变量

public cluValues 

private getClu(){

this.cluValues = ...

}

<componentName [clu] = cluValues>

<componentName>

哪一个更好？

谢谢你的回答

【问题讨论】：

标签： angular typescript

【解决方案1】：

Click popup open but data not showing Please solve the problem in app script please help me


Index:


<!DOCTYPE html>
<html>
  <head>
    <base target="_top">
    <?!=include ('CSS');?>
   
  </head>
  <body>
    <div class="container">
      <div class="row">


        <? data.forEach(row=>{?>

              <div class="card m-3" style="width: 18rem;">
                <img src="https://drive.google.com/uc?export=download&id=<?!= row[10]  ?>" class="card-img-top" alt="...">
                <div class="card-body">
                  <h5 class="card-title"><?!=row[1] + '  '  + row[2]  ?></h5>
                  <p class="card-text"><?!=row[3] + ' |# '+ row[4] + ' |# '+ row[5] ?> </p>
                  <buttom type="buttom" class="btn btn-primary"data-bs-toggle="modal" data-bs-target="#exampleModal"data-bs-player="<?!= row ?>"> Go somewhere</a>
                </div>
              </div>
        
        <? }); ?>



<!-- Modal -->

      <div class="modal fade" id="exampleModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">
        <div class="modal-dialog">
          <div class="modal-content">
            <div class="modal-header bg">
              
              <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
            </div>
            
              <div class="modal-body bg">
               <div class="row d-flex align-items-center">
                <div class="col-md-6">
                  <img src=" " class="modal-img" alt="playerImage">
                </div>
                  <div class="col-md-6 align-middle playerInfo">
                    <h2 class="modal-body-lastName"></h2>
                    <h2 class="modal-body-Name"></h2>
                    <h6 class="modal-body-basic-info"></h6>
                </div>
              </div>
             </div>
              <div class="modal-footer">
              <div class="container">

                <div class="row">
                  <div class="col text-center">
                    <h4> PPP </h4> </br>
                    <h4 class="modal-footer-ppp"></h4>
                  </div>
                <div class="col text-center">
                  <h4> RPP </h4> </br>
                  <h4 class="modal-footer-rpp"></h4>
                </div>
                <div class="col text-center">
                  <h4> APP </h4> </br>
                  <h4 class="modal-footer-app"></h4>
                  
                 </div>
                  </div>
                 </div>
            </div>
           </div>
            </div>
            </div>
          </div>
        </diV>  
     </diV>
          <?!=include ( 'JS');?>




   
  </body>
</html>




CSS:

<!-- CSS only -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-Zenh87qX5JnK2Jl0vWa8Ck2rdkQ2Bzep5IDxbcnCeuOxjzrPF/et3URy9Bv1WTRi" crossorigin="anonymous">

<style>

body{
  padding:20px;
}
.bg{
  background-color: #1D76BC;
}
.playerInfo{
  vertical-align:middle;
  color:white;
}
</style>


Js:

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>

<script>
  var exampleModal = document.getElementById('exampleModal')
  exampleModal.addEventListener('show.bs.modal', function (event) {
    // Button that triggered the modal
    var button = event.relatedTarget
    // Extract info from data-bs-* attributes
    var recipient = button.getAttribute('data-bs-player')
    // If necessary, you could initiate an AJAX request here
    // and then do the updating in a callback.

    
      var playerInfo=recipient.split(".");
      console.log( playerInfo );

     // get the attribute value into variables
      var modalLastName = exampleModal.querySelector('.modal-LastName')
      var modalImag = exampleModal.querySelector('.modal-img')
      var modalName = exampleModal.querySelector('.modal-name')
      var modalBasicInfo = exampleModal.querySelector('.modal-basic-info')

       var modalPPP = exampleModal.querySelector('.modal-footer-ppp')
       var modalRPP = exampleModal.querySelector('.modal-footer-rpp')
       var modalAPP = exampleModal.querySelector('.modal-footer-app')

    // Update the modal's content.
    modalLastName.textContent = player[1];
    modalName.textContent = player[2];
    modalImag.src"https://drive.google.com/uc?export=view&id= "  + player[10];
    modalBasicInfo.textContent = player[3] +'|'+player[4] +'|'+player[5];

     modalPPP.textContent = player[6];
     modalRPP.textContent = player[7];
     modalAPP.textContent = player[8];
  
  })
</script>

【讨论】：