為什么b能輸出，而b.reverse()不能輸出
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Array對象 </title>
<script type="text/javascript">
? ?var myarr1= ["我","愛","你"];
? ?var t = myarr1.join("");
//? ?document.write(t.reverse());
? ?
? ? var b = t.concat("喲");
? ? ?document.write(b);
? ? document.write(b.reverse());
? ??
</script>
</head>
<body>
</body>
</html>
2018-11-04
變量t是一個字符串，concat是連接數(shù)組，不是字符串。
2018-11-04
? var myarr1= ["我","愛","你"];
? var t=myarr1.join("");
? document.write(t+"<br>");
? ? ?document.write(myarr1.concat(["喲"])+"<br>");
? ? document.write(myarr1.reverse());