仅供同学参考，如果有更好的方法，烦请告诉我怎么优化，谢谢
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<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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<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>
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