(Javascript) 我如何 link 子菜单按钮到一个功能？

Question

我即将完成一个项目，但我一直在尝试 link 我的功能按钮。我成功地编辑了菜单，但我需要 link 按钮才能使用我创建的功能。

例如，当我查看

<a href="#">Add a side to your Dice</a>
<a href="#">Remove a side to your Dice</a>
<a href="#">Add an additional Roll</a>

我要如何添加函数才能让它们实际执行某些操作？

onClick="promoteDice()
onClick="demoteDice()
onClick="addRoll()

标签也一样：

  <a href="#roll">Roll</a>
  <a href="#exit">Exit</a>

我看不到我应该在哪里添加功能，所以它可以工作。

这是我的实际骰子游戏供参考我不需要你合并我的脚本我只是需要帮助解决这个问题。

<!DOCTYPE html>
<html>
    <body>
    <input type="button" value="Roll The Dice" onClick="rollDice()" />
    <input type="button" value="Upgrade The Dice" onClick="upgradeDice()" />
    <input type="button" value="Quit" onClick="quit()" />
<script>    
var myscore = 0;
var housescore = 0;
var dicesides = 6;
var diceroll = 1

function rollDice() {
  var x = Math.floor(Math.random() * dicesides) + 1;
  var y = Math.floor(Math.random() * dicesides) + 1;

  var total = x + y;
  msg = "You rolled " + x + ", " + y + " = " + total + "\n";
    if (total != 11 && total < 7 && x != y) {
            housescore += 1;
      msg += "Even Up";
        } else if (total != 11 && total > 7 && x != y) {
            myscore += 1;
      msg += "Player Up";
        }
  if (total == 7 || total == 11) {
    housescore += 10;
    msg += "CRAPS";
  } else if (x == y) {
    if (x % 2 == 0) {
      myscore += 10;
      msg += "Even Up";
    } else {
      housescore += 10;
      msg += "Odd Ball";
    }
  }
    msg += " Your Score is " + "Player: " + myscore + ", House: " + housescore;
  alert(msg);
    didIwin();

}
function didIwin() {
    if (housescore >= 100) {
    alert ("Sorry the house won the game!");
    } else if (playerscore >= 100) {
    alert ("Congratulations you won the game!");
    }
    myscore = 0;
    housescore = 0;
    dicesides = 6;
}
function upgradeDice() {
    if (myscore >= 10) {
    dicesides += 1;
    alert ("Your Dice now have " + dicesides + " sides");
    } else {
difference = 10 - myscore;
alert ("You need "+difference+" more points");
    }
}
function quit() {
  alert (" Your Score is " + "Player: " + myscore + ", House: " + housescore);
    myscore = 0;
    housescore = 0;
    dicesides = 6;
    }




</script>
</body>
</html>

最后是我要合并功能的菜单代码：

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<style>
.navbar {
  overflow: hidden;
  background-color: #333;
  font-family: Arial, Helvetica, sans-serif;
}

.navbar a {
  float: left;
  font-size: 16px;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.dropdown {
  float: left;
  overflow: hidden;
}

.dropdown .dropbtn {
  cursor: pointer;
  font-size: 16px;  
  border: none;
  outline: none;
  color: white;
  padding: 14px 16px;
  background-color: inherit;
  font-family: inherit;
  margin: 0;
}

.navbar a:hover, .dropdown:hover .dropbtn, .dropbtn:focus {
  background-color: red;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  float: none;
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}

.dropdown-content a:hover {
  background-color: #ddd;
}

.show {
  display: block;
}
</style>
</head>
<body>

<div class="navbar">
  <a href="#roll">Roll</a>
  <a href="#exit">Exit</a>
  <div class="dropdown">
  <button class="dropbtn" onclick="myFunction()">Upgrade
    <i class="fa fa-caret-down"></i>
  </button>
  <div class="dropdown-content" id="myDropdown">
    <a href="#">Add a side to your Dice</a>
    <a href="#">Remove a side to your Dice</a>
    <a href="#">Add an additional Roll</a>
  </div>
  </div> 
</div>

<h3>Dropdown Menu inside a Navigation Bar</h3>
<p>Click on the "Dropdown" link to see the dropdown menu.</p>

<script>
/* When the user clicks on the button, 
toggle between hiding and showing the dropdown content */
function myFunction() {
  document.getElementById("myDropdown").classList.toggle("show");
}

// Close the dropdown if the user clicks outside of it
window.onclick = function(e) {
  if (!e.target.matches('.dropbtn')) {
  var myDropdown = document.getElementById("myDropdown");
    if (myDropdown.classList.contains('show')) {
      myDropdown.classList.remove('show');
    }
  }
}
</script>
</body>
</html>

Answer 1

您可以按照前面示例中的相同方式添加功能，您在子菜单中或其他地方并不重要。

只需将 onclick 属性和函数添加到要触发执行的 HTML 标记，然后就可以了。

在我的示例中，我将函数 myFunc(); 添加到骰子子菜单的添加侧，但是您可以将任何逻辑和任何其他内容添加到 HTML 标签的其余部分，这只是一个例子。

附带说明：函数 myFunc(); 中的代码可以更改为任何内容。

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<style>
.navbar {
  overflow: hidden;
  background-color: #333;
  font-family: Arial, Helvetica, sans-serif;
}

.navbar a {
  float: left;
  font-size: 16px;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.dropdown {
  float: left;
  overflow: hidden;
}

.dropdown .dropbtn {
  cursor: pointer;
  font-size: 16px;  
  border: none;
  outline: none;
  color: white;
  padding: 14px 16px;
  background-color: inherit;
  font-family: inherit;
  margin: 0;
}

.navbar a:hover, .dropdown:hover .dropbtn, .dropbtn:focus {
  background-color: red;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  float: none;
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}

.dropdown-content a:hover {
  background-color: #ddd;
}

.show {
  display: block;
}
</style>
</head>
<body>

<div class="navbar">
  <a href="#roll">Roll</a>
  <a href="#exit">Exit</a>
  <div class="dropdown">
  <button class="dropbtn" onclick="myFunction()">Upgrade
    <i class="fa fa-caret-down"></i>
  </button>
  <div class="dropdown-content" id="myDropdown">
    <a href="#" onclick="myFunc();">Add a side to your Dice</a>
    <a href="#">Remove a side to your Dice</a>
    <a href="#">Add an additional Roll</a>
  </div>
  </div> 
</div>

<h3>Dropdown Menu inside a Navigation Bar</h3>
<p>Click on the "Dropdown" link to see the dropdown menu.</p>

<script>

function myFunc() {
  alert('You clicked a submenu item')
}
/* When the user clicks on the button, 
toggle between hiding and showing the dropdown content */
function myFunction() {
  document.getElementById("myDropdown").classList.toggle("show");
}

// Close the dropdown if the user clicks outside of it
window.onclick = function(e) {
  if (!e.target.matches('.dropbtn')) {
  var myDropdown = document.getElementById("myDropdown");
    if (myDropdown.classList.contains('show')) {
      myDropdown.classList.remove('show');
    }
  }
}
</script>
</body>
</html>

Answer 2

您只需像这样将 onclick 添加到 link 中：

<a href="#" onclick="promoteDice()">Add a side to your Dice</a>
<a href="#" onclick="demoteDice()">Remove a side to your Dice</a>
<a href="#" onclick="addRoll()">Add an additional Roll</a>

您可能还想使用 <button type="button" onclick="addRoll()">Add Roll</button>，因为 <a> 标签只应在您 link 做某事时使用。

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