PROSAGA码农传奇-JS-JavaScript：在进度条上停止动画

<div class =“post-text”itemprop =“text”>
  <P>
    要停止进度动画，请考虑使用
    <a href="https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/clearInterval" rel="nofollow noreferrer">
      该
       <code>
        clearInterval()
      </code>
       方法
    </A>
     它允许您停止驱动增量动画的基础间隔。
  </p>
  <P>
    该
     <code>
      clearInterval()
    </code>
     method接受一个interval id（这是一个值）
     <code>
      setInterval()
    </code>
     函数返回），并使相应的间隔回调停止运行。
  </p>
  <P>
    要将它与您的代码集成，您可以拉动
     <code>
      var id
    </code>
     在...之外
     <code>
      autoProgress()
    </code>
     功能，以便它可以访问
     <code>
      stopProgress()
    </code>
     （你打电话的地方
     <code>
      clearInterval()
    </code>
    ）。此外，作为安全措施，请考虑清除您的运行中存在的任何现有间隔
     <code>
      id
    </code>
     在开始一个新变量之前变量 - 防止一次运行多个间隔（这可能会搞乱你的进度动画）。
  </p>
  <P>
    见
     <code>
      /*Update:*/
    </code>
     以下代码段中的注释可获得更多详细信息：
  </p>
  <P>
  </p>
  <div class =“snippet”data-lang =“js”data-hide =“false”data-console =“true”data-babel =“false”>
    <div class =“snippet-code”>
       <pre class="snippet-code-js lang-js prettyprint-override">
        <code>
          //Get Current Value of attributes
function getProgress() {
	return document.getElementById("progressbar").getAttribute("aria-valuenow");
	return document.getElementById("progressbar").getAttribute("style","width:");
	return document.getElementById("progressbar").innerHTML;
	}

//Set value of attributes
function setProgress(value) {
	document.getElementById("progressbar").setAttribute("aria-valuenow",value);
	document.getElementById("progressbar").setAttribute("style","width: " +value+ "%");	
	document.getElementById("progressbar").innerHTML = (value+ "%"); 
}

//Call get function assign a variable to this, When value is less than 100 value increases by 1. 
function increment() {
	var i = getProgress();
	if(i < 100){
		i++;
		setProgress(i);	
	}else{
		alert("Progress Complete!"); //Alert presents itself once the value reaches max value.
	}
}

//Decrease current value by -1.
function decrement() {
	var d = getProgress();
	setProgress(d - 1);
}

//Current value set back to 0.
function resetButton() {
	var r = getProgress();
	setProgress(r = 0);
}

/* Update: Move id out side of autoProgress() */
var id;

//Auto complete value to max in this case max is 100 with Interval of 100.
function autoProgress() {
	var elem = document.getElementById("progressbar");
	var width = 0;
  /* Update: stop any previous interval if one exists, and set
  new interval */
  stopProgress();
	id = setInterval(frame, 100);
	function frame(){
		if(width == 100){
			clearInterval(id);
		}else{
			width++;
			elem.style.width = width + '%';
			elem.innerHTML = width * 1 + '%';
		}
	}
}

//Stop Auto complete value at current value when button is pressed.
function stopProgress(){
	/* Update: Stop id interval */
  clearInterval(id)
  id = ''
}
        </code>
      </pre>
       <pre class="snippet-code-html lang-html prettyprint-override">
        <code>
          <!doctype html>
<html lang="en">
  <head>
    
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">
	
		
    <title>Progress Bar</title>
	
  </head>
  
  <body>
	
	<div class="container">
	
    <h1>This Process bar is animated using <br>JavaScript!</h1>
	<br>
	
	
	<div class="progress">
		<div class="progress-bar progress-bar-striped" role="progressbar"  style="width: 0%;" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100" id="progressbar" >0%</div>
	</div>
	
	<br>
	
	<button type="button" class="btn btn-primary" onclick = "increment()">Increment</button>
	<button type="button" class="btn btn-dark" onclick="resetButton()">Reset</button>
	<button type="button" class="btn btn-success" onclick="decrement()">Decrement</button>
	<button type="button" class="btn btn-warning" onclick="autoProgress()">Start Auto Progress!</button>
	<button type="button" class="btn btn-danger" onclick="stopProgress()">Stop Auto Progress!</button>

</div>
	
    
    
    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js" integrity="sha384-wHAiFfRlMFy6i5SRaxvfOCifBUQy1xHdJ/yoi7FRNXMRBu5WHdZYu1hA6ZOblgut" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js" integrity="sha384-B0UglyR+jN6CkvvICOB2joaf5I4l3gm9GU6Hc1og6Ls7i6U/mkkaduKaBhlAXv9k" crossorigin="anonymous"></script>
	<script src="Assignment4.js"></script>
 </body>
</html>
        </code>
      </pre>
    </DIV>
  </DIV>
  <P>
  </p>
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