微信小程序怎么实现输入支付密码demo

<view catchtap='showInputLayer' class="btn_pay">立即支付</view><!-- 密码输入框 --><view wx:if='{{showPayPwdInput}}'><view class='bg_layer'></view><view class='input_main'><view class='input_title'><view class='input_back' catchtap='hidePayLayer'><text></text></view><text>输入支付密码</text></view><view class='input_tip'><text>使用会员卡余额支付需要验证身份，验证通过后才可进行支付。</text></view><view class='input_row' catchtap='getFocus'><view class='pwd_item' wx:for='{{6}}' wx:key='item' wx:for-index='i'><text wx:if='{{pwdVal.length>i}}'></text></view></view><view class='forget_pwd' catchtap='hidePayLayer'>忘记密码</view><input class='input_control' password type='number' focus='{{payFocus}}' bindinput='inputPwd' maxlength='6'/></view></view>

//index.js//获取应用实例const app = getApp() Page({data: {showPayPwdInput: false, //是否展示密码输入层pwdVal: '', //输入的密码payFocus: true, //文本框焦点},onLoad: function () {this.showInputLayer();},/*** 显示支付密码输入层*/showInputLayer: function(){this.setData({ showPayPwdInput: true, payFocus: true });},/*** 隐藏支付密码输入层*/hidePayLayer: function(){ var val = this.data.pwdVal; this.setData({ showPayPwdInput: false, payFocus: false, pwdVal: '' }, function(){wx.showToast({title: val,})}); },/*** 获取焦点*/getFocus: function(){this.setData({ payFocus: true });},/*** 输入密码监听*/inputPwd: function(e){this.setData({ pwdVal: e.detail.value }); if (e.detail.value.length >= 6){this.hidePayLayer();}}})

.btn_pay{margin: 100rpx auto; width: 600rpx; height: 100rpx; line-height: 100rpx; border-radius: 100rpx;background-color: #d3a95a; color: #fff; font-size: 36rpx; text-align: center;}/* 支付密码css start */.bg_layer{position: fixed; left: 0; top: 0; bottom: 0; right: 0;background-color: rgba(0, 0, 0, 0.6); z-index: 9998;}.input_main{position: fixed; left: 0; bottom: 500rpx; width: 100%; height: 394rpx;background-color: #fff; z-index: 9999;}.input_title{width: 100%; height: 90rpx; line-height: 90rpx; text-align: center;font-size: 32rpx; border-bottom: 1rpx solid #e2e2e2;}.input_back{position: absolute; left: 0; top: 0;width: 80rpx; height: 90rpx; display: flex; justify-content: center; align-items: center;}.input_back text{width: 20rpx;height: 20rpx;background-color: white;border: 1rpx solid #aaa;border-width: 5rpx 0 0 5rpx;transform: rotate(-45deg);} .input_tip{ margin: 30rpx; font-size: 24rpx; color: #888; } /* 密码掩码模拟 */.input_row{width: 690rpx; margin: 0 auto; height: 98rpx; position: relative;display: flex; align-items: center; border: 1rpx solid #e2e2e2; border-radius: 20rpx;}.input_row .pwd_item{flex: 1; display: flex; align-items: center; justify-content: center;height: 100%; border-right: 1rpx solid #e2e2e2; position: relative;}.pwd_item:nth-last-of-type(1) { border-right: 0; }.pwd_item text {width: 30rpx; height: 30rpx; border-radius: 30rpx; background-color: #555;}  .forget_pwd{float: right; margin: 30rpx; width: 100rpx; text-align: right; font-size: 24rpx; color: #ff7800;} /* 文本输入框位置: 设置到左边隐藏 */.input_control {position: relative; left: -300rpx; bottom: 0; width: 100rpx; height: 100rpx;}