JavaScript数组求和

<script>

function demo(){

var d=document.getElementsByTagName("input")[0].value.split(",");

var sum=0;

for(var i in d){

sum+=parseInt(d[i]);

}

var ss=document.getElementsByTagName("div")[0];
ss.innerHTML=sum;
}
</script>

<input  type="text" size="30" placeholder="请输入数字，以半角逗号分隔"/>

<input type="button" onclick="demo()" value="求和"/>

<div>
</div>