泛域名解析

泛解析的用途

1.可以让域名支持无限的子域名(这也是泛域名解析最大的用途)。
2.防止用户错误输入导致的网站不能访问的问题
3.可以让直接输入网址登陆网站的用户输入简洁的网址即可访问网站
泛域名在实际使用中作用是非常广泛的，比如实现无限二级域名功能，提供免费的url转发，在IDC部门实现自动分配免费网址，在大型企业中实现网址分类管理等等，都发挥了巨大的作用。

通俗来说就是输入容易域名都可以访问到网站

js实现随机域名跳转主站


<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<!--[if IE 8]><style>.ie8 .alert-circle,.ie8 .alert-footer{display:none}.ie8 .alert-box{padding-top:75px}.ie8 .alert-sec-text{top:45px}</style><![endif]-->
<!--QQ沐编程 www.qqmu.com-->
<title>正在进入请稍等</title>
<style>
body {
    margin: 0;
    padding: 0;
    background: #E6EAEB;
    font-family: Arial, '微软雅黑', '宋体', sans-serif
}
.alert-box {
    display: none;
    position: relative;
    margin: 96px auto 0;
    padding: 180px 85px 22px;
    border-radius: 10px 10px 0 0;
    background: #FFF;
    box-shadow: 5px 9px 17px rgba(102,102,102,0.75);
    width: 286px;
    color: #FFF;
    text-align: center
}
.alert-box p {
    margin: 0
}
.alert-circle {
    position: absolute;
    top: -50px;
    left: 111px
}
.alert-sec-circle {
    stroke-dashoffset: 0;
    stroke-dasharray: 735;
    transition: stroke-dashoffset 1s linear
}
.alert-sec-text {
    position: absolute;
    top: 11px;
    left: 190px;
    width: 76px;
    color: #000;
    font-size: 68px
}
.alert-sec-unit {
    font-size: 34px
}
.alert-body {
    margin: 35px 0
}
.alert-head {
    color: #242424;
    font-size: 28px
}
.alert-concent {
    margin: 25px 0 14px;
    color: #7B7B7B;
    font-size: 18px
}
.alert-concent p {
    line-height: 27px
}
.alert-btn {
    display: block;
    border-radius: 10px;
    background-color: #4AB0F7;
    height: 55px;
    line-height: 55px;
    width: 286px;
    color: #FFF;
    font-size: 20px;
    text-decoration: none;
    letter-spacing: 2px
}
.alert-btn:hover {
    background-color: #6BC2FF
}
.alert-footer {
    margin: 0 auto;
    height: 42px;
    width: 120px
}
.alert-footer-icon {
    float: left
}
.alert-footer-text {
    float: left;
    border-left: 2px solid #EEE;
    padding: 3px 0 0 5px;
    height: 40px;
    color: #0B85CC;
    font-size: 12px;
    text-align: left
}
.alert-footer-text p {
    color: #7A7A7A;
    font-size: 22px;
    line-height: 18px
}
</style>
</head>
<body class="ie8">

<div id="js-alert-box" class="alert-box">
    <svg class="alert-circle" width="234" height="234">
        <circle cx="117" cy="117" r="108" fill="#FFF" stroke="#43AEFA" stroke-width="17"></circle>
        <circle id="js-sec-circle" class="alert-sec-circle" cx="117" cy="117" r="108" fill="transparent" stroke="#F4F1F1" stroke-width="18" transform="rotate(-90 117 117)"></circle>
        <text class="alert-sec-unit" x="82" y="172" fill="#BDBDBD">秒</text>
    </svg>
    <div id="js-sec-text" class="alert-sec-text"></div>
    <div class="alert-body">
        <div id="js-alert-head" class="alert-head"></div>
        <div class="alert-concent">
            <p>用心建设每一个网站</p>
            <p>您身边的网站建设专家</p>
        </div>
        <a id="js-alert-btn" class="alert-btn" href="http://www.baidu.com">立即前往</a>
    </div>
    <div class="alert-footer clearfix">
        <svg width="46px" height="42px" class="alert-footer-icon">
            <circle fill-rule="evenodd" clip-rule="evenodd" fill="#7B7B7B" stroke="#DEDFE0" stroke-width="2" stroke-miterlimit="10" cx="21.917" cy="21.25" r="17"/>
            <path fill="#FFF" d="M22.907,27.83h-1.98l0.3-2.92c-0.37-0.22-0.61-0.63-0.61-1.1c0-0.71,0.58-1.29,1.3-1.29s1.3,0.58,1.3,1.29 c0,0.47-0.24,0.88-0.61,1.1L22.907,27.83z M18.327,17.51c0-1.98,1.61-3.59,3.59-3.59s3.59,1.61,3.59,3.59v2.59h-7.18V17.51z M27.687,20.1v-2.59c0-3.18-2.59-5.76-5.77-5.76s-5.76,2.58-5.76,5.76v2.59h-1.24v10.65h14V20.1H27.687z"/>
            <circle fill-rule="evenodd" clip-rule="evenodd" fill="#FEFEFE" cx="35.417" cy="10.75" r="6.5"/>
            <polygon fill="#7B7B7B" stroke="#7B7B7B" stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="10" points="35.417,12.16 32.797,9.03 31.917,10.07 35.417,14.25 42.917,5.29 42.037,4.25 "/>
        </svg>
        <div class="alert-footer-text"><p>secure</p>安全加密 </div>
    </div>
</div>


<script type="text/javascript">
function alertSet(e) {
    document.getElementById("js-alert-box").style.display = "block",
    document.getElementById("js-alert-head").innerHTML = e;
    var t = 5,
    n = document.getElementById("js-sec-circle");
    document.getElementById("js-sec-text").innerHTML = t,
    setInterval(function() {
        if (0 == t){
            // 修改这部分以生成随机字符串并添加"."
            var randomStr = "";
            for (var i = 0; i < 8; i++) {
                randomStr += String.fromCharCode(Math.floor(Math.random() * 26) + 97);
            }
            location.href = "http://" + randomStr + ".baidu.com";
        } else {
            t -= 1,
            document.getElementById("js-sec-text").innerHTML = t;
            var e = Math.round(t / 10 * 735);
            n.style.strokeDashoffset = e - 735
        }
    },
    970);
}

</script>

<script>alertSet('正在进入请稍等');</script>
 
</body>
</html>

泛解析的用途

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