jquery를 사용하여 Alipay와 유사한 결제 키보드를 모바일 단말기에 구현(코드)

<!-- 支付键盘 -->
    <divclass="pay-container">
        <divclass="pay-title">
            <spanclass="pay-title-remove">×</span>
            输入支付密码
        </div>
        <divclass="pay-body">
            <divclass="input-container">
                <inputclass="input-item"type="password"readonly>
                <inputclass="input-item"type="password"readonly>
                <inputclass="input-item"type="password"readonly>
                <inputclass="input-item"type="password"readonly>
                <inputclass="input-item"type="password"readonly>
                <inputclass="input-item"type="password"readonly>
            </div>
            <divclass="forgetPwd-container">
                <aclass="forgetPwd"href="">忘记密码？</a>
            </div>
            <divclass="key-container">
                <divclass="key-item">1</div>
                <divclass="key-item">2</div>
                <divclass="key-item">3</div>
                <divclass="key-item">4</div>
                <divclass="key-item">5</div>
                <divclass="key-item">6</div>
                <divclass="key-item">7</div>
                <divclass="key-item">8</div>
                <divclass="key-item">9</div>
                <divclass="key-item empty"></div>
                <divclass="key-item">0</div>
                <divclass="key-item remove"></div>
            </div>
        </div>
    </div>

.pay-container{ width:7.5rem; height:8rem; background-color:#fbf9fb; position:fixed;z-index:999; overflow:hidden;display:none; }
/* .pay-container-show{transform: translate3d(0, -8.9rem, 0);transition: 0.5s ease;transform: translate3d(0, 0, 0); transition: 0.5s ease;} */
.pay-title{ height:0.96rem; line-height:0.96rem; border-bottom:1pxsolid#b3afaf; text-align:center; color:#070707;
position:relative; font-size:0.36rem;}
.pay-title.pay-title-remove{ width:0.24rem; height:0.24rem; position:absolute; top:0.35rem; left:0.33rem; line-height:0.28rem;
font-size:0.45rem;}
.pay-body{ padding-top:0.56rem;position:relative; height:7rem; box-sizing:border-box;}
.pay-body.input-container{ width:6.74rem; height:0.93rem; border:1pxsolid#ebe8eb; overflow:hidden; border-radius:5px;
background-color:#fff; margin:0auto; display:flex;flex-direction:row;align-items:center; 
flex-wrap:wrap; justify-content:center;align-content:center;}
.pay-body.input-container.input-item{ width:1.1rem; height:0.92rem; display:inline-block; margin:0; border-right:1pxsolid#ebe8eb;
text-align:center; line-height:0.92rem; border-radius:0; }
.pay-body.input-container.input-item:nth-last-child(1){ border-right:0;}
.pay-body.forgetPwd-container{width:6.74rem;margin:0.22remauto0; text-align:right;}
.pay-body.forgetPwd-container.forgetPwd{ color:#52bfff; font-size:0.24rem; }
.pay-body.key-container{ width:100%; height:4.56rem; position:absolute; bottom:0; display:flex;flex-direction:row;align-items:center; 
    flex-wrap:wrap; justify-content:center;align-content:center; }
.pay-body.key-container.key-item{ width:2.47rem; height:1.12rem; line-height:1.12rem; text-align:center; border-right:2pxsolid#f3f3f3;
    border-top:2pxsolid#f3f3f3; font-size:0.66rem; color:#1e1d1f;background-color:#fff;}
.pay-body.key-container.key-item:nth-child(3),
.pay-body.key-container.key-item:nth-child(6),
.pay-body.key-container.key-item:nth-child(9),
.pay-body.key-container.key-item:nth-child(12){ border-right:0;}
.pay-body.key-container.key-item.remove,.pay-body.key-container.key-item.empty{ font-size:0.24rem;background-color:#e6e9f1;}
.pay-body.key-container.key-item.remove{ background:url('../images/pay-remove.png') centerno-repeat#e6e9f1; background-size:.52rem.32rem; }
.pay-body.key-container.selected{ background-color:#e4e8f4;}

var arr = [];
        var num =0;

        //响应键盘事件
        $('.key-item').on('touchstart', function () {
            $(this).addClass('selected')
        })
        $('.key-item').on('touchend', function () {
            $(this).removeClass('selected')
        })
        $('.key-item').on('click', function () {
            var value =$(this).text();
            var inputItem =$('.layui-m-layercont .input-item');
            if (!$(this).hasClass('remove')) {
                if (num <6) {
                    $(inputItem[num]).val(value);
                    if (num ==5) {
                        var arr = [];
                        for (var i =0; i < inputItem.length; i++) {
                            arr.push(inputItem[i].value)
                        }
                        arr =parseInt(arr.join(&#39;&#39;));
                        if (arr !==123456) {
                            layer.open({
                                content:&#39;支付密码错误请重新输入！&#39;,
                                skin:&#39;msg&#39;,
                                time:2//2秒后自动关闭
                            });
                        } else {
                            layer.open({
                                content:&#39;输入正确！&#39;,
                                skin:&#39;msg&#39;,
                                time:2//2秒后自动关闭
                            });
                        }
                        num++;
                        returnfalse;
                    }
                    num++;
                }
            } else {
                if (num >0) {
                    num--;
                    $(inputItem[num]).val(&#39;&#39;);
                }
            }
        })