项目需求，使用ng写一个密码框格子支付模块，一开始使用一个input+letter-spacing来分割字符，但是发现间距非常不好控制，随着字符的输入文本框字符串间距还会自动调整。最终从网上查找到一款jq仿支付宝密码输入框，于是我模仿编写了个指令模块。
效果如下：
完整代码如下：
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta name="format-detection" content="telephone=no"/>
<title>使用ng仿写支付宝密码框</title>
<style>
*{ margin: 0; padding: 0;}
.t{ margin-left: 100px;}
.pass-form{position:relative;top:20px; left: 50px; width:100%;}
.pass-form .pass-input{position:absolute;top:0;height:75px;line-height:75px;font-size:14px;color:#000;opacity:0;box-shadow:none}
.pass-form .pass-border-box{position:absolute;top:0;font-size:0}
.pass-form .pass-border-box .faguang{position:absolute;top:0;left:0;z-index:9;box-shadow:0 0 8px rgba(60,100,100,.6);width:75px;height:75px;background:#fff;opacity:0}
.pass-form .pass-border-box .pass-border{display:inline-block;position:relative;z-index:10;width:75px;height:75px;border:solid 1px #dcdcdc;border-left:none;-webkit-box-sizing:border-box;box-sizing:border-box}
.pass-form .pass-border-box .pass-border:first-child{border-left:solid 1px #dcdcdc}
.pass-form .pass-border-box .pass-border.active{background:url(../img/icons/icon_guangbiao.gif) no-repeat center center #fff}
.pass-form .pass-border-box .pass-border i{display:block;margin:0 auto;margin-top:22px;width:20px;height:20px;border-radius:100%}
</style>
</head>
<body ng-app="demo" ng-controller="pageCtrl">
<div class="t">ng仿写支付宝密码框</div>
<form class="pass-form" name="pass_form" novalidate pass-form>
<label for="pass">
<input class="pass-input Jpass" type="tel" name="pass" id="pass" autocomplete="off" ng-model="pass" required maxlength="6" />
<div class="pass-border-box">
<span class="pass-border"><i>dot</i></span>
<span class="pass-border"><i>dot</i></span>
<span class="pass-border"><i>dot</i></span>
<span class="pass-border"><i>dot</i></span>
<span class="pass-border"><i>dot</i></span>
<span class="pass-border"><i>dot</i></span>
<div class="faguang Jfaguang"></div>
</div>
</label>
</form>
<script src="/UploadFiles/2021-04-02/angular.min.js">
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