js仿支付宝填写支付密码效果实现多方框输入密码

.pwd-box{
width:310px;
padding-left: 1px;
position: relative;
border: 1px solid #9f9fa0;
border-radius: 3px;
}
.pwd-box input[type="tel"]{
width: 99%;
height: 45px;
color: transparent;
position: absolute;
top: 0;
left: 0;
border: none;
font-size: 18px;
opacity: 0;
z-index: 1;
letter-spacing: 35px;
}
.fake-box input{
width: 44px;
height: 48px;
border: none;
border-right: 1px solid #e5e5e5;
text-align: center;
font-size: 30px;
}
.fake-box input:nth-last-child(1){
border:none;
}

.pwd-box .pwd-input:focus{//密码框聚焦的时候需要改变其位置，否则IOS上会有闪动的光标~
left:-1000px;
top: -100px;
}

var $input = $(".fake-box input");
      $("#pwd-input").on("input", function() {
        var pwd = $(this).val().trim();
        for (var i = 0, len = pwd.length; i < len; i++) {
          $input.eq("" + i + "").val(pwd[i]);
        }
        $input.each(function() {
          var index = $(this).index();
          if (index >= len) {
            $(this).val("");
          }
        });
        if (len == 6) {
          self.sendPackage(pwd);//发送密码
        }
      });