实现简单输入支付密码的输入

    <div class="gswithdrawaltck">
    <h1><font>&#xe683;</font><em>58.00元</em></h1>
    <h2>提现银行卡:邮政银行</h2>
<div class="gswithdrawaltckinput"><input  id="aa" type="password"  name="mima" oninput="shuru(this.value);" onpropertychange="shuru(this.value)"/> <input type="password" name="mima"  /> <input type="password" name="mima"  /> <input type="password" name="mima" /> <input type="password" name="mima" /> <input type="password" name="mima" /> </div>

    </div>

    <script>


        function shuru(el) {
            var num = ch();
            var tag = document.getElementsByName("mima");
            tag[0].value = el.substr(el.length - 1, 1);
            tag[num].value = el.substr(el.length - 1, 1);
     
        }
        var i = 0;
        function ch() {
            return i++;
        }


    </script>