实现效果

简介
点击金额模块区域，获取焦点。
点击非金额模块区域，失去焦点且隐藏支付键盘。
支持小数点两位数字。
付款金额默认置灰，点击付款按钮无效。当输入付款金额后，付款按钮还原正常状态。
删除按钮可以通过icon图标或者图片来替换，达到和微信数字支付键盘一样的效果。
有更合适的实现方式或者代码不合理的地方，欢迎留言交流
实现代码

// index.wxml

<view class="pay-container" catchtap="handleHiddenKey">
    <view class="pay-header">
        <view>
            付款给企业
            <view class="company-name">(深圳****公司)</view>
        </view>
    </view>

    <view class="pay-main">
        <view class="pay-money-title">付款金额</view>
        <view class="pay-input-wrapper" catchtap="handleShowKey">
            <text class="pay-icon">￥</text>
            <view hidden="{{!payMoney}}" class="pay-money">{{ payMoney }}</view>
            <view hidden="{{keyHidden}}" class="pay-cursor"></view>
        </view>
    </view>
</view>

<view class="keyboard {{ !keyHidden && 'hind_box' }}">
    <view class="key-box">
        <view class="number-box clearfix">
            <view
                wx:for="{{KeyboardKeys}}"
                wx:key="*this"
                data-key="{{item}}"
                class="key {{ index === 9 ? 'key-zero' : ''}}"
                hover-class="number-box-hover"
                catchtap="handleKey"
            >{{item}}</view>
        </view>
        <view class="btn-box">
            <!-- TODO: 需要替换成删除icon -->
            <view class="key" hover-class="number-box-hover" data-key="X" catchtap="handleKey">X</view>
            <view class="key pay_btn {{payMoney ? '' : 'pay-btn-display'}}" hover-class="pay-btn-hover" catchtap="handlePay">付款</view>
        </view>
    </view>
</view>

// index.wxss
/* pages/pay/index.wxss */
.clearfix::after {
    content: '';
    display: table;
    clear: both;
}
.pay-container {
    padding: 0 62rpx;
    height: 100%;
}
.pay-header {
    height: 260rpx;
    display: flex;
    align-items: center;
}
.company-name {
    font-size: 24rpx;
    margin-top: 12rpx;
    color: #909399;
}
.pay-money-title {
    font-size: 28rpx;
}
.pay-input-wrapper {
    margin-top: 12rpx;
    position: relative;
    display: flex;
    height: 100rpx;
    line-height: 100rpx;
    align-items: center;
}
.pay-input-wrapper:after {
    content: " ";
    position: absolute;
    left: -50%;
    right: -50%;
    bottom: 0;
    border-bottom: 1px solid rgb(235, 237, 240);
    transform: scaleX(.5);
}
.pay-icon,
.pay-money {
    font-size: 72rpx;
    font-weight: bold;
}
.pay-money {
    margin-right: 4rpx;
}
.pay-cursor {
    width: 6rpx;
    height: 66rpx;
    background: #1AAD19;
    border-radius: 6rpx;
    animation: twinkling 1.5s infinite;
}

@keyframes twinkling {
    0% {
        opacity: 0;
    }
    90% {
        opacity: .8;
    }
    100% {
        opacity: 1;
    }
}
.keyboard {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 999;
    height: 0;
    background: #f7f7f7;
    transition: height 0.3s;
}
.hind_box {
    height: 456rpx;
}

.key-box {
    display: flex;
    padding-left: 16rpx;
    padding-bottom: 16rpx;
    padding-bottom: calc(16rpx + constant(safe-area-inset-bottom));
    padding-bottom: calc(16rpx + env(safe-area-inset-bottom));
}
.number-box {
    flex: 3;
}
.number-box .key {
    float: left;
    margin: 16rpx 16rpx 0 0;
    width: calc(100% / 3 - 16rpx);
    height: 90rpx;
    border-radius: 10rpx;
    line-height: 90rpx;
    text-align: center;
    font-size: 40rpx;
    font-weight: bold;
    background-color: #fff;
}
.number-box .key.key-zero {
    width: calc((100% / 3) * 2 - 16rpx);
}
.keyboard .number-box-hover {
    /* 临时定义颜色 */
    background-color: #e1e1e1 !important;
}
.btn-box {
    flex: 1;
}
.btn-box .key {
    margin: 16rpx 16rpx 0 0;
    height: 90rpx;
    border-radius: 10rpx;
    line-height: 90rpx;
    text-align: center;
    font-size: 40rpx;
    font-weight: bold;
    background-color: #fff;
}

.btn-box .pay_btn {
    height: 298rpx;
    line-height: 298rpx;
    font-weight: normal;
    background-color: #1AAD19;
    color: #fff;
    font-size: 32rpx;
}
.btn-box .pay_btn.pay-btn-display{
    background-color: #9ED99D !important;
 }
.btn-box .pay_btn.pay-btn-hover{
    background-color: #179B16;
 }

// index.js
Page({

    /**
     * 页面的初始数据
     */
    data: {
        KeyboardKeys: [1, 2, 3 , 4, 5, 6, 7, 8, 9, 0,'.'],

        payMoney: '', // 支付金额
        keyHidden: false
    },

    /**
     * 生命周期函数--监听页面加载
     */
    onLoad: function (options) {

    },
    // 隐藏键盘
    handleHiddenKey() {
        this.setData({
            keyHidden: true
        })
    },
    // 显示键盘
    handleShowKey() {
        this.setData({
            keyHidden: false
        })
    },
    // 键盘输入
    handleKey(e) {
        const that = this
        const { key } = e.currentTarget.dataset
        const { payMoney } = this.data
        // 删除金额
        if (key === 'X') {
            if (payMoney !== '') {
                const money = payMoney.slice(0, payMoney.length - 1)
                that.setData({
                    payMoney: money
                })
            }
        } else {
            // 添加金额
            const money = payMoney + key
            console.log(/^(\d+\.?\d{0,2})$/.test(money), money, 'money')
            if (/^(\d+\.?\d{0,2})$/.test(money)) {
                that.setData({
                    payMoney: money
                })
            }
        }
    },
    // 支付
    handlePay() {
        const { payMoney } = this.data
        if (payMoney === '') return

        console.log(Number(payMoney), '付款')
    }

})

版权声明：本文为CSDN博主「Martin-Luo」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/Dragon_Luo/article/details/123109188