复选框计算不起作用

您的复选框具有类似 $25.00 Gift Card 的值。您需要将其更改为数字，例如 25 .

如果您坚持使用当前的标记，则可以使用以下方法获得实际数字

var val = this.value.substr(1).split(' ')[0];
tot += +(val);

虽然擅长正则表达式的人可能会想出更漂亮的东西。

一种方法，使用String.prototype.match()和Array.prototype.reduce()：

$(document).ready(function() {
  $("input[type=checkbox]").on("change", function() {
    // concatenating a currency symbol to the result of mapping the checked checkboxes:
    var total = '$' + $('input[type="checkbox"]:checked').map(function(){
      // matching one-or-more numbers (''d+') followed by a (literal) period (''.')
      // followed by one-or-more numbers:
      var n = this.value.match(/'d+'.'d+/);
      // if there was a match (and 'n' is therefore not-null), and has a length,
      // we parseFloat that matched number string, otherwise we return 0:
      return n && n.length ? parseFloat(n[0]) : 0;
    // get() converts the 'map' into an array:
    }).get()
    // reduce() sums together the array-elements ('a + b'):
    .reduce(function (a, b) {
      return a + b;
      // '0' is the supplied starting value for reduce():
    }, 0)
    // toFixed(2) converts the number to a string, with two decimal places:
    .toFixed(2);
    $("#result").text("Total = " + total);
    $('#CRCGCA').val("Total = " + total)
  });
});

$(document).ready(function() {
  $("input[type=checkbox]").on("change", function() {
    var total = '$' + $('input[type="checkbox"]:checked').map(function(){
      var n = this.value.match(/'d+'.'d+/);
      return n && n.length ? parseFloat(n[0]) : 0;
    }).get().reduce(function (a, b) {
      return a + b;
    }, 0).toFixed(2);
    $("#result").text("Total = " + total);
    $('#CRCGCA').val("Total = " + total)
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p>Gift Certificate Amount (check one or more)
  <br />
  <span class="wpcf7-form-control-wrap GRCGA"><span class="wpcf7-form-control wpcf7-checkbox wpcf7-validates-as-required Multiple radio-vertical" id="GRCGA"><span class="wpcf7-list-item first"><label><input type="checkbox" name="GRCGA[]" value="$10.00 Gift Card" />&nbsp;<span class="wpcf7-list-item-label">$10.0 Gift Card</span>
  </label>
  </span><span class="wpcf7-list-item"><label><input type="checkbox" name="GRCGA[]" value="$20.00 Gift Card" />&nbsp;<span class="wpcf7-list-item-label">$20.00 Gift Card</span>
  </label>
  </span><span class="wpcf7-list-item"><label><input type="checkbox" name="GRCGA[]" value="$25.00 Gift Card" />&nbsp;<span class="wpcf7-list-item-label">$25.00 Gift Card</span>
  </label>
  </span><span class="wpcf7-list-item"><label><input type="checkbox" name="GRCGA[]" value="$40.00 Gift Card" />&nbsp;<span class="wpcf7-list-item-label">$40.00 Gift Card</span>
  </label>
  </span><span class="wpcf7-list-item"><label><input type="checkbox" name="GRCGA[]" value="$100.00 Gift Card" />&nbsp;<span class="wpcf7-list-item-label">$100.00 Gift Card</span>
  </label>
  </span><span class="wpcf7-list-item"><label><input type="checkbox" name="GRCGA[]" value="$200.00 Gift Card" />&nbsp;<span class="wpcf7-list-item-label">$200.00 Gift Card</span>
  </label>
  </span><span class="wpcf7-list-item"><label><input type="checkbox" name="GRCGA[]" value="$400.00 Gift Card" />&nbsp;<span class="wpcf7-list-item-label">$400.00 Gift Card</span>
  </label>
  </span><span class="wpcf7-list-item last"><label><input type="checkbox" name="GRCGA[]" value="$500.00 Gift Card" />&nbsp;<span class="wpcf7-list-item-label">$500.00 Gift Card</span>
  </label>
  </span>
  </span>
  </span>
</p>
<p>Gift Card Amount: <span class="wpcf7-form-control-wrap CRCGCA"><input type="text" name="CRCGCA" value="" size="8" maxlength="8" class="wpcf7-form-control wpcf7-text" id="CRCGCA" aria-invalid="false" /></span>
</p>
<p id="result"></p>

引用：

• JavaScript：
  • Array.prototype.reduce() .
  • JavaScript 正则表达式。
  • Number.prototype.toFixed() .
  • parseFloat() .
  • String.prototype.match() .
• j查询：
  • get() .
  • map() .
  • text() .
  • val() .