僅供同學參考，如果有更好的方法，煩請告訴我怎么優化，謝謝
<!DOCTYPE?html>
<html?lang="en">
<head>
????<meta?charset="UTF-8">
????<meta?name="viewport"?content="width=device-width,?initial-scale=1.0">
????<meta?http-equiv="X-UA-Compatible"?content="ie=edge">
????<title>Document</title>
</head>
<body>
????<script?type="text/javascript">
????????var??arr?=?['*','##',"***","&&","****","##*"];
????????arr[7]?=?"**";
????????var?j=0;
????????for(?i=0;i<arr.length;i++){
????????????j++;
????????????if(j%2!=0&&arr[i]?!=?null){
????????????????document.write(arr[i]+"<br>");
????????????????if(j==1){
????????????????????document.write(arr[7]+"<br>");
????????????????}
????????????}?
????????}
????????</script>
</body>
</html>
2019-12-10
這樣只需要聲明一個變量，僅供參考
2020-02-13
真的是大神啊，想的好多呀?
2019-11-28
運行結果：
2019-11-28
代碼圖：