How to use jQuery to increment and decrement input values

Use jQuery to realize the method of increment and decrement of input value. In many e-commerce websites, when it comes to the quantity of goods on the page where the shopping cart is located, it will be provided A + button and a - button are used to increase and decrease by 1, and only allow numerical values ​​to be entered in the input. At this time, jQuery is needed to implement , is accompanied by jQuerySource code~

First introduce the necessary css and js files.

<link href="bootstrap/css/bootstrap.min.css" rel="stylesheet" />
<link href="css/jquery.bootstrap-touchspin.min.css" rel="stylesheet" />
<script src="Scripts/jquery-2.1.3.min.js"></script>
<script src="bootstrap/js/bootstrap.min.js"></script>
<script src="Scripts/jquery.bootstrap-touchspin.min.js"></script>

## 1. Control the accuracy and auto-increment and auto-decrement of numerical values ​​

<br />
<div style="margin-left: 10px;">
        <form class="form-horizontal" role="form">
            <div class="form-group">
                <div class="col-xs-2">
                    <input id="demo1" type="text" value="55" name="demo1" class="form-control" />
                </div>
            </div>
        </form>
</div>
<script type="text/javascript">
        $(function () {
            $("input[name=&#39;demo1&#39;]").TouchSpin({
                min: 0,
                max: 100,
                step: 0.1,//增量或减量
                decimals: 2, //精度
                boostat: 5,
                maxboostedstep: 10,
                postfix: &#39;%&#39; //后缀
            });
        });
</script>

● Click the + button to increment by 0.1● Click the - button to decrement by 0.1
● Keep 2 decimal places
● The minimum allowed value is 0.00
● The maximum allowed value 100.00
● Only numerical values ​​are allowed to be entered, otherwise the focus is lost and the minimum value is displayed 0.00

2. Only integers starting from 1 are allowed, this is also the shopping cart page Commonly used methods

<div style="margin-left: 10px;">
        <form class="form-horizontal" role="form">
            <div class="form-group">
                <div class="col-xs-2">
                    <input id="demo2" type="text" value="1" name="demo2" class="form-control" />
                </div>
            </div>
        </form>
</div>
<script type="text/javascript">
        $(function () {
            $("input[name=&#39;demo2&#39;]").TouchSpin({
                min: 1,
                max: 100,
                step: 1//增量或减量
            });
        });
</script>

● Click the + button to increase it by 1● Click the - button to decrement it by 1
● The minimum allowed value is 1
● The maximum allowed value is 100
● Only numerical values ​​are allowed to be entered, otherwise the focus is lost and the minimum value is displayed 1

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