Question

我有三个带按钮的标签然后点击我需要将值增加1

     <script>
        function incrementValue() {
            var label = document.getElementById('number');
            label.textContent = (parseInt(label.textContent, 10) || 0) + 1;
        }
</script>
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
       <table >
        <tr><td><asp:Label ID="lbl1" runat="server" Text="Major"></asp:Label></td><td></td></tr>
        <tr><td><asp:Label ID="lbl2" runat="server" Text="1.0"></asp:Label></td><td></td></tr>        
        <tr><td><asp:Label ID="number" runat="server" Text="0"></asp:Label></td><td></td></tr>
     </table>
        <input type="button" onclick="incrementValue()" value="click" />
        </div>

Answer 1

使用 textContent 获取和更新标签内的文字内容。然后使用 match() 获取最后一位数字，增加并更新内容。

<script>
  function incrementValue() {
    var value = parseInt(document.getElementById('number').textContent.match(/\d+$/)[0], 10);
    value = isNaN(value) ? 0 : value;
    value++;
    document.getElementById('number').textContent = 'major 1.0 ' + value;
  }
</script>

<label id="number">major 1.0 0</label>
<input type="button" onclick="incrementValue()" value="Increment Value" />

可以更简化

<script>
  function incrementValue() {
    var label = document.getElementById('number');
    label.textContent = 'major 1.0 ' + ((parseInt(label.textContent.match(/\d+$/)[0], 10) || 0) + 1);
  }
</script>

<label id="number">major 1.0 0</label>
<input type="button" onclick="incrementValue()" value="Increment Value" />

如果字符串变化，你可以做类似的事情

<script>
  function incrementValue() {
    var label = document.getElementById('number');
    var m = label.textContent.match(/^(.*)(\d+)$/);
    label.textContent = m[1] + ((parseInt(m[2], 10) || 0) + 1);
  }
</script>

<label id="number">major 1.0 0</label>
<input type="button" onclick="incrementValue()" value="Increment Value" />

使用您自己的简单三元运算符

<script>
  function incrementValue() {
    var label = document.getElementById('number');
    var m = label.textContent.match(/^(.*?)(\d+)$/);
    var value = parseInt(m[2], 10);
    value = isNaN(value) ? 0 : value;
    label.textContent = m[1] + (value + 1)
  }
</script>

<label id="number">major 1.0 0</label>
<input type="button" onclick="incrementValue()" value="Increment Value" />

更新：根据更新后的问题，您可以

<script>
  document.onkeyup = KeyCheck;

  function KeyCheck(e) {
    var key = (window.event) ? event.keyCode : e.keyCode;
    if (key == 113) {
      var label = document.getElementById('number');
      var m = label.textContent.match(/^(.*?)(\d+)$/);
      var value = parseInt(m[2], 10);
      value = isNaN(value) ? 0 : value;
      label.textContent = m[1] + (value + 1)
    }
  }
</script>

<label id="number">major 1.0 0</label>

使用javascript按钮单击将标签值增加1

1 个答案: