无法控制台记录我单击的div

时间：2019-04-15 03:20:04

标签： javascript html

我正在做一个四连环游戏，现在我只想让控制台记录被点击的div上的div。但是由于某种原因，被记录的div不是被单击的那个。被记录的div总是在面板的底部？有人可以帮我了解为什么会这样。谢谢：）

const board = document.querySelectorAll(".slot");

for(let i = 0; i < board.length; i++) {
	board[i].addEventListener('click', dropChip);
}

function dropChip() {
	console.log(this);
}
/** {
	border: 1px solid red;
}*/

*,
*:before,
*:after {
  box-sizing: inherit;
}

html {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  display: flex;
  justify-content: flex-end;
  min-height: 100vh;
  background-color: #e6e9ef;
  flex-direction: column;
}

.board-wrapper {
  /*display: flex;*/
  margin: 0 auto;
  padding-top: 100px;
  position: relative;
  overflow: hidden;
}

.board {
  display: flex;
  background-color: #00c;
  flex-wrap: wrap;
  max-width: 706px;
  padding: 3px;
  /*margin: auto;*/
}

.board>div {
  width: 100px;
  height: 100px;
  background-color: blue;
  border: 3px solid #00c;
  cursor: pointer;
  position: relative;
}

.board>div:after {
  content: "";
  position: absolute;
  z-index: 99;
  left: 0;
  right: 0;
  top: -999em;
  bottom: -999em;
  transition: all .5s ease;
  background-color: transparent;
}

.board>div:hover:after {
  background-color: #00c;
}

.board>div.counter {
  /*display: block;
	padding: 0;*/
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  width: auto;
  height: 100px;
  border: none;
  background-color: #e6e9ef;
  z-index: 100;
}

.board>div.counter:after {
  /*content: "";*/
  /*display: block;*/
  /*padding: 0;*/
  height: 80px;
  width: 80px;
  background-color: red;
  top: 0;
  /*left: 0;
	right: auto;*/
  border-radius: 50%;
  transition: transform .5s ease, opacity .2s ease;
  /*transform: translateX(0);*/
  z-index: 100;
  opacity: 0;
}

.board>div.counter:before {
  content: "";
  display: block;
  padding: 0;
  position: absolute;
  top: 15px;
  left: 15px;
  right: auto;
  height: 50px;
  width: 50px;
  border-radius: 50%;
  background-color: red;
  box-shadow: inset 0px 0px 25px #cc0000;
  z-index: 101;
  transition: transform .5s ease, opacity .2s ease;
  /*transform: translateX(0);*/
  opacity: 0;
}

.board>div:nth-of-type(7n+1):hover~.counter:after {
  transform: translateX(14px);
  opacity: 1;
}

.board>div:nth-of-type(7n+2):hover~.counter:after {
  transform: translateX(114px);
  opacity: 1;
}

.board>div:nth-of-type(7n+3):hover~.counter:after {
  transform: translateX(214px);
  opacity: 1;
}

.board>div:nth-of-type(7n+4):hover~.counter:after {
  transform: translateX(314px);
  opacity: 1;
}

.board>div:nth-of-type(7n+5):hover~.counter:after {
  transform: translateX(414px);
  opacity: 1;
}

.board>div:nth-of-type(7n+6):hover~.counter:after {
  transform: translateX(514px);
  opacity: 1;
}

.board>div:nth-of-type(7n+7):hover~.counter:after {
  transform: translateX(614px);
  opacity: 1;
}

.board>div:nth-of-type(7n+1):hover~.counter:before {
  transform: translateX(14px);
  opacity: 1;
}

.board>div:nth-of-type(7n+2):hover~.counter:before {
  transform: translateX(114px);
  opacity: 1;
}

.board>div:nth-of-type(7n+3):hover~.counter:before {
  transform: translateX(214px);
  opacity: 1;
}

.board>div:nth-of-type(7n+4):hover~.counter:before {
  transform: translateX(314px);
  opacity: 1;
}

.board>div:nth-of-type(7n+5):hover~.counter:before {
  transform: translateX(414px);
  opacity: 1;
}

.board>div:nth-of-type(7n+6):hover~.counter:before {
  transform: translateX(514px);
  opacity: 1;
}

.board>div:nth-of-type(7n+7):hover~.counter:before {
  transform: translateX(614px);
  opacity: 1;
}
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>Connect Four</title>
  <link rel="stylesheet" href="style.css">
</head>

<body>
  <div class="board-wrapper">
    <div class="board">
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="counter"></div>
    </div>
  </div>
  <script src="script.js"></script>
</body>

</html>

3 个答案:

答案 0 :(得分：4)

已发现问题实际上是CSS，但我将其留在此处以获取更多信息。

常见的方法是将event.target作为dropChip函数的参数传递

const board = document.querySelectorAll(".slot");

for(let i = 0; i < board.length; i++) {
    board[i].addEventListener('click', function(evt){ dropChip(evt.target) });
}


function dropChip(div) {
    console.log(div);
}

在执行回调时，事件侦听器将始终自动提供event对象，这就是为什么我们在匿名函数上添加了evt参数的原因。

如果您想简单明了，也可以省略匿名功能

for(let i = 0; i < board.length; i++) {
    board[i].addEventListener('click', dropChip);
}


function dropChip(evt) {
    console.log(evt.target);
}

您也可以在循环过程中传递迭代项

for(let i = 0; i < board.length; i++) {
    board[i].addEventListener('click', function(evt){ dropChip(board[i]) });
}

答案 1 :(得分：2)

注释.board>div:after CSS规则解决了正确的this上下文问题。这是因为您所有的插槽div都具有相同的高度。因此，DOM中最底层的div位于其余部分之上。您的JS实际上很好，是CSS使div变得如此之大，以至于您看起来像是在单击其中的一个，但单击是在DOM中更低的其他位置上注册的。

const board = document.querySelectorAll(".slot");

for(let i = 0; i < board.length; i++) {
	board[i].addEventListener('click', dropChip);
}

function dropChip() {
	console.log(this);
}
/** {
	border: 1px solid red;
}*/

*,
*:before,
*:after {
  box-sizing: inherit;
}

html {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  display: flex;
  justify-content: flex-end;
  min-height: 100vh;
  background-color: #e6e9ef;
  flex-direction: column;
}

.board-wrapper {
  /*display: flex;*/
  margin: 0 auto;
  padding-top: 100px;
  position: relative;
  overflow: hidden;
}

.board {
  display: flex;
  background-color: #00c;
  flex-wrap: wrap;
  max-width: 706px;
  padding: 3px;
  /*margin: auto;*/
}

.board>div {
  width: 100px;
  height: 100px;
  background-color: blue;
  border: 3px solid #00c;
  cursor: pointer;
  position: relative;
}

/* Commented out.
.board>div:after {
  content: "";
  position: absolute;
  z-index: 99;
  left: 0;
  right: 0;
  top: -999em;
  bottom: -999em;
  transition: all .5s ease;
  background-color: transparent;
}*/

.board>div:hover:after {
  background-color: #00c;
}

.board>div.counter {
  /*display: block;
	padding: 0;*/
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  width: auto;
  height: 100px;
  border: none;
  background-color: #e6e9ef;
  z-index: 100;
}

.board>div.counter:after {
  /*content: "";*/
  /*display: block;*/
  /*padding: 0;*/
  height: 80px;
  width: 80px;
  background-color: red;
  top: 0;
  /*left: 0;
	right: auto;*/
  border-radius: 50%;
  transition: transform .5s ease, opacity .2s ease;
  /*transform: translateX(0);*/
  z-index: 100;
  opacity: 0;
}

.board>div.counter:before {
  content: "";
  display: block;
  padding: 0;
  position: absolute;
  top: 15px;
  left: 15px;
  right: auto;
  height: 50px;
  width: 50px;
  border-radius: 50%;
  background-color: red;
  box-shadow: inset 0px 0px 25px #cc0000;
  z-index: 101;
  transition: transform .5s ease, opacity .2s ease;
  /*transform: translateX(0);*/
  opacity: 0;
}

.board>div:nth-of-type(7n+1):hover~.counter:after {
  transform: translateX(14px);
  opacity: 1;
}

.board>div:nth-of-type(7n+2):hover~.counter:after {
  transform: translateX(114px);
  opacity: 1;
}

.board>div:nth-of-type(7n+3):hover~.counter:after {
  transform: translateX(214px);
  opacity: 1;
}

.board>div:nth-of-type(7n+4):hover~.counter:after {
  transform: translateX(314px);
  opacity: 1;
}

.board>div:nth-of-type(7n+5):hover~.counter:after {
  transform: translateX(414px);
  opacity: 1;
}

.board>div:nth-of-type(7n+6):hover~.counter:after {
  transform: translateX(514px);
  opacity: 1;
}

.board>div:nth-of-type(7n+7):hover~.counter:after {
  transform: translateX(614px);
  opacity: 1;
}

.board>div:nth-of-type(7n+1):hover~.counter:before {
  transform: translateX(14px);
  opacity: 1;
}

.board>div:nth-of-type(7n+2):hover~.counter:before {
  transform: translateX(114px);
  opacity: 1;
}

.board>div:nth-of-type(7n+3):hover~.counter:before {
  transform: translateX(214px);
  opacity: 1;
}

.board>div:nth-of-type(7n+4):hover~.counter:before {
  transform: translateX(314px);
  opacity: 1;
}

.board>div:nth-of-type(7n+5):hover~.counter:before {
  transform: translateX(414px);
  opacity: 1;
}

.board>div:nth-of-type(7n+6):hover~.counter:before {
  transform: translateX(514px);
  opacity: 1;
}

.board>div:nth-of-type(7n+7):hover~.counter:before {
  transform: translateX(614px);
  opacity: 1;
}
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>Connect Four</title>
  <link rel="stylesheet" href="style.css">
</head>

<body>
  <div class="board-wrapper">
    <div class="board">
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="slot"></div>
      <div class="counter"></div>
    </div>
  </div>
  <script src="script.js"></script>
</body>

</html>

如果该规则的目的是突出显示一列中的所有div，则可能需要其他方法。

答案 2 :(得分：1)

通常，我不在事件监听器中使用throw。我觉得很混乱，应该认为是反模式。您可以使用this，方法更清晰。 

evt.target

至于一个解释，我也很困惑。我认为您的代码应该可以工作...

编辑：原来这是一个CSS问题（请参阅Maaz的answer），我没有调查样式表，所以错过了这一部分。 OP的脚本有效，可以正常工作。

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