2.(for循环)计算1+3+5+…+99的和(html)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
var sum=0;
for(var i=1;i<=99;i=i+2)
{
sum=sum+i;
}
console.log(sum);
</script>
</body>
</html>