js for 循环
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>for循环</title>
</head>
<body>
<h1>同志交友</h1>
<hr>
<script>
// 输出 0 到 10之间的偶数
for (var a = 0; a < 11; a ++) {
if (a % 2 === 0) {
console.log(a)
}
}
console.log('');
// 输出 0 到 10之间的偶数
for (var i = 0; i < 11; i += 2) {
console.log(i)
}
console.log('');
console.log(i);
console.log(a)
</script>
</body>
</html>
