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count.html
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="Content-type" content="text/html">
<title>
周帝的作品
</title>
<style type="text/css">
body{text-align:center;}
.text{width:200px;}
.button{margin-top:30px;}
#sum{color:red;font-size:30px;}
</style>
</head>
<body>
<input type="text" class="text" id="text" value="1,2,3,4,5"/><span> 请输入数字，再以,号相隔。</span>
<p><button>求和</button></p>
<strong id="sum"></strong>
</body>
<script type="text/javascript">
window.onload=function(){
var oBtn=document.getElementsByTagName("button")[0];
var oInput=document.getElementsByTagName("input")[0];
var oSum=document.getElementsByTagName("strong")[0];
oInput.onkeyup=function(){
this.value=this.value.replace(/[^(\d)|(,)]/,"");
}
oBtn.onclick=function(){
var sum=0;
var oInput = document.getElementById("text").value.split(",");
for(i=0,l=oInput.length;i<l;i++){
sum += parseInt(oInput[i]);
}
oSum.innerHTML=sum;
}
}
</script>
</html>