Javascript事件處理程序無法正常工作

Question

我試圖在單擊按鈕時增加/減少段落中的值。

$(document).ready(function() {
  var breakTime = 5;
  var section = 25;
  var start = "Start";
  var stop = "Stop";


  function Pomodoro(element, target) {
    this.element = element;
    this.target = target;
  };

  Pomodoro.prototype.incrementer = function incrementer() {
    // this takes care of break and section timers incrementing

    this.element.click(function() {
      breakTime++;
      var el = this.target;
      el.html(breakTime);
    });
  };
  // end

  Pomodoro.prototype.decrementer = function decrementer() {
    // this takes care of break and section timers incrementing

    breakerDec.element.click(function() {
      breakTime--;
      var el = breakerDec.target.html(breakTime);
    });
  };
  // end

  var breakerInc = new Pomodoro();
  var ele = $("#inner1");
  var tar = $("#par");

  breakerInc.element = ele;
  breakerInc.target = tar;

  breakerInc.incrementer.bind(breakerInc);
  //end

  var breakerDec = new Pomodoro();

  breakerDec.element = $("#inner2");
  breakerDec.target = $("#par");

  breakerDec.decrementer();

  var sectionInc = new Pomodoro($("#inner3"), $("#par2"));
  sectionInc.incrementer.bind(sectionInc);
});

當我點擊按鈕時，我沒有得到任何結果。 這是html：

<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Pomodoro Timer</title><!-- End of Title -->
    <link rel="stylesheet" type="text/css" href="style.css">
  </head>
  <body>
    <div class="wrapper">
      <div class="top">
        <div class="div div-1"><p id="par" class="breaktime-1">5</p>
          <div  class="inner-div inner-1"><button id="inner1" type="button" class="btn">+</button></div>
          <div class="inner-div inner-2"><button id="inner2" type="button" class="btn">-</button></div>
        </div>
        <div class="div div-2"><p id="par2" class="breaktime">25</p>
          <div class="inner-div inner-1"><button id="inner3" type="button" class="btn">+</button></div>
          <div class="inner-div inner-2"><button id="inner4" type="button" class="btn">-</button></div>
        </div>
      </div>
      <div class="div div-3">
        <h3 class="heading">section</h3>
        <button type="button" class="btn-Start-Stop"></button
      </div>
      <div><p></p></div>
    </div>

    <script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-2.1.4.js"></script> 
    <script type="text/javascript" src="main.js"></script>
  </body>
</html>

Answer 1

這是一個（精簡）解決方案，只使用vanilla javascript：

 function changeValue() { var breaktime = this.parentNode.getElementsByClassName('breaktime')[0]; var val = breaktime.innerHTML; if (this.className === 'increment') { val++; } else if (this.className === 'decrement') { val--; } breaktime.innerHTML = val; } function startStop() { var values = []; var breaktimes = document.getElementsByClassName('breaktime'); breaktimes[1].classList.toggle('decrementing'); if (breaktimes[1].classList.contains('decrementing') === true) { values[1] = parseInt(breaktimes[1].innerHTML); values[1]--; breaktimes[1].innerHTML = values[1]; var decrementer = setInterval(function(){ values[0] = parseInt(breaktimes[0].innerHTML); values[1] = parseInt(breaktimes[1].innerHTML); if (breaktimes[1].classList.contains('decrementing') !== true) { clearInterval(decrementer); } values[1]--; breaktimes[1].innerHTML = values[1]; if (values[1] === values[0]) { window.alert('The counter has reached ' + values[1]); clearInterval(decrementer); } }, 1000); } } var buttons = document.getElementsByTagName('button'); var startStopButton = buttons[(buttons.length -1)]; for (var i = 0; (i+1) < buttons.length; i++) { buttons[i].addEventListener('click',changeValue,false); } startStopButton.addEventListener('click',startStop,false);

 <section> <div> <p class="breaktime">5</p> <button id="inner1" type="button" class="increment">+</button> <button id="inner2" type="button" class="decrement">-</button> </div> <div> <p class="breaktime">25</p> <button id="inner3" type="button" class="increment">+</button> <button id="inner4" type="button" class="decrement">-</button> </div> <div> <h3>Section</h3> <button type="button" class="btn-Start-Stop">Start / Stop</button> </div> <div> <p></p> </div> </section>

Answer 2

如果您想使用構造函數實現邏輯，則可以在實例的初始化內綁定事件。

這是根據您的HTML重新編寫您的代碼。 但代碼可以改進，因此Pomodoro實例不僅可以減少或增加，而且可以同時執行這兩個功能。

此外，一些模板引擎可以讓您輕松定義要添加到頁面的增加/減少塊的數量。

Javascript事件處理程序無法正常工作

問題描述

2 個解決方案

解決方案1
0 已采納 2016-01-21 12:10:34

解決方案2
0 2016-01-21 12:47:09

Javascript事件處理程序無法正常工作

問題描述

2 個解決方案

解決方案1 0 已采納 2016-01-21 12:10:34

解決方案2 0 2016-01-21 12:47:09

解決方案1
0 已采納 2016-01-21 12:10:34

解決方案2
0 2016-01-21 12:47:09