求出数组中所有数字的和&&弹出层效果

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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>求出数组中所有数字的和</title>
<style>
body{color:#999;font:12px/1.5 Tahoma;}
#outer{500px;margin:0 auto;}
#outer input{padding:3px;border:1px solid #ccc;font-family:inherit;220px;margin-right:10px;}
.sum{font-size:30px;color:red;}
</style>
<script>
window.onload = function ()
{
    var oBtn = document.getElementsByTagName("button")[0];
    var oInput = document.getElementsByTagName("input")[0]
    var oStrong = document.getElementsByTagName("strong")[0];
    oInput.onkeyup = function ()
    {
        this.value = this.value.replace(/[^(d)|(,)]/,"")
    }    
    oBtn.onclick = function ()
    {
        var sum = 0;
        var oInput = document.getElementsByTagName("input")[0].value.split(",");
        for (var i in oInput)
        {
            sum += parseInt(oInput[i])
        }
        oStrong.innerHTML = sum
    }
}
</script>
</head>
<body>
<div id="outer">
    <label><input type="text" value="1,2,3,4,5,6,7,8,9,10,11,12,13,14,15" /><span>输入数字求和，数字之间用半角","号分隔</span></label>
    <p><button>求和</button></p>
    <strong class="sum"></strong>
</div>
</body>
</html>

弹出层效果

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<html xmlns="http://www.w3.org/1999/xhtml">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>弹出层效果</title>
<style>
html,body{height:100%;overflow:hidden;}
body,div,h2{margin:0;padding:0;}
body{font:12px/1.5 Tahoma;}
center{padding-top:10px;}
button{cursor:pointer;}
#overlay{position:absolute;top:0;left:0;100%;height:100%;background:#000;opacity:0.5;filter:alpha(opacity=50);display:none;}
#win{position:absolute;top:50%;left:50%;400px;height:200px;background:#fff;border:4px solid #f90;margin:-102px 0 0 -202px;display:none;}
h2{font-size:12px;text-align:right;background:#FC0;border-bottom:3px solid #f90;padding:5px;}
h2 span{color:#f90;cursor:pointer;background:#fff;border:1px solid #f90;padding:0 2px;}
</style>
<script>
window.onload = function ()
{
    var oWin = document.getElementById("win");
    var oLay = document.getElementById("overlay");    
    var oBtn = document.getElementsByTagName("button")[0];
    var oClose = document.getElementById("close");
    oBtn.onclick = function ()
    {
        oLay.style.display = "block";
        oWin.style.display = "block"    
    };
    oClose.onclick = function ()
    {
        oLay.style.display = "none";
        oWin.style.display = "none"    
    }
};
</script>
</head>
<body>
<div id="overlay"></div>
<div id="win"><h2><span id="close">×</span></h2></div>
<center><button>弹出层</button></center>
</body>
</html>