购物时添加数量

购物数量添加：

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style>
            body{
                margin: 0;
            }
            .left{
                float: left;
            }
            .wrap{
                 150px;
                height: 22px;
                border: 1px solid #ddd;
                /*background-color: red;*/
                position: relative;
                left: 100px;
                top: 100px;
            }
            .wrap .minus{
                height: 22px;
                 22px;
                line-height: 22px;
                text-align: center;
                cursor: pointer;
            }
            .wrap .plus{
                height: 22px;
                 22px;
                line-height: 22px;
                text-align: center;
                cursor: pointer; /*当鼠标指的时候变样式*/
            }
            .wrap .count input{
                padding: 0;  /*input是有padding的*/
                border: 0;
                 104px;
                height: 22px;
                border-left: 1px solid #dddddd;
                border-right: 1px solid #dddddd;
            }
        </style>
    </head>
    <body>
        <div class="wrap">
            <div class="minus left" onclick='Minus();'>-</div>
            <div class="count left">
                <input id='count' type="text"  />
            </div>
            <div class="plus left" onclick='Plus();'>+</div>
        </div>
        <script type="text/javascript">
            function Plus(){
                var old_str = document.getElementById('count').value
                var old_int = parseInt(old_str);
                var new_int = old_int + 1
                document.getElementById('count').value = new_int
            }
            function Minus(){
                var old_str = document.getElementById('count').value
                var old_int = parseInt(old_str);
                var new_int = old_int - 1
                document.getElementById('count').value = new_int
            }

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


cursor:pointer;  /*鼠标尖头变小手*/
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