基于JS实现横线提示输入验证码随验证码输入消失(js验证码的实现)

<div class="main-out"><p class="identifying-title">输入企业提供的验证码，即可完成签到</p><!--黑色横线框--><div class="pass-box"><div class="pass-line"><div class="line-box"><span class="line line-one"></span></div><div class="line-box"><span class="line line-two"></span></div><div class="line-box"><span class="line line-three"></span></div><div class="line-box"><span class="line line-four"></span></div><div class="line-box"><span class="line line-five"></span></div><div class="line-box"><span class="line line-six"></span></div></div><!--输入验证码框给一个绝对定位--><div class="passInput" id="on"><input type="text" class="inputCont inputCont-one" maxlength="1" /><input type="text" class="inputCont inputCont-two" maxlength="1"/><input type="text" class="inputCont inputCont-three" maxlength="1"/><input type="text" class="inputCont inputCont-four" maxlength="1"/><input type="text" class="inputCont inputCont-five" maxlength="1"/><input type="text" class="inputCont inputCont-six" maxlength="1"/></div></div></div>

.identifying-title{width: 100%;margin-top: 100px;font-size: 14px;color:#333;text-align: center;}.pass-box{position: relative;width: 240px;height: 40px;margin: 50px auto 0;}.pass-line{margin:0 auto;width:100%;height:100%;}.line-box{float: left;width: 40px;height: 40px;}.line{display: block;width: 25px;height:3px;margin:18px auto 0;background: #000;}.passInput{position: absolute;width:240px;height:40px;left: 0;top: 0;}.inputCont{float: left;width: 25px;height:40px;margin:0 7.5px;z-index: 2;font-size:30px;color:#333;line-height: 40px;text-align: center;background: none;}

<script type="text/javascript" src="js/jquery-2.1.4.min.js"></script><script>$(function(){//控制输入框只能输入一位并且是数字$(".inputCont-one").focus();$(".line-one").hide()onload = function(){var txts = on.getElementsByTagName("input");for(var i = 0; i<txts.length;i++){var t = txts[i];t.index = i;t.setAttribute("readonly", true);t.onkeyup=function(){if(this.value=this.value.replace(//D/g,'')) {var next = this.index + 1;if(next > txts.length - 1) return;txts[next].removeAttribute("readonly");txts[next].focus();}else{$(this).focus();}}}txts[0].removeAttribute("readonly");}// 输入框获得焦点的时候后面的横线消失$(".inputCont-one").focus(function(){$(".line-one").hide()})$(".inputCont-two").focus(function(){$(".line-two").hide()})$(".inputCont-three").focus(function(){$(".line-three").hide()})$(".inputCont-four").focus(function(){$(".line-four").hide()})$(".inputCont-six").focus(function(){$(".line-six").hide()})$(".inputCont-five").focus(function(){$(".line-five").hide()})})</script>