jQuery仿移动端支付宝键盘的实现代码

最近做项目时碰到一个需求，就是在移动端支付页面点击支付按钮弹出一个支付键盘，类似于支付宝的那种。由于项目只是单纯的手机网站，而并非app，所以这个功能得由前端来实现。话不多说，先上图看看效果。

尼玛，这不就是支付宝app那个支付键盘吗？ 没错，咱们UI就是参照支付宝做的这个键盘。你可能会问，为什么不直接调用支付宝提供的支付接口呢。额，因为项目需要，这里就不多解释了。

我们先看一下实现后的效果图

HTML部分

<!-- 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>

CSS部分

.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;}

核心JS部分

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(''));
            if (arr !==123456) {
              layer.open({
                content:'支付密码错误请重新输入！',
                skin:'msg',
                time:2//2秒后自动关闭
              });
            } else {
              layer.open({
                content:'输入正确！',
                skin:'msg',
                time:2//2秒后自动关闭
              });
            }
            num++;
            returnfalse;
          }
          num++;
        }
      } else {
        if (num >0) {
          num--;
          $(inputItem[num]).val('');
        }
      }
    })

总结