javascript - 无法更改多个className

经过数小时的愤怒，愤怒，震惊-也许仅仅是出于怀疑，我才来到这里，这是发生在我身上的一切。

我试图在冗长的脚本中创建最简单的函数-通过ID获取元素，然后根据变量更改类的一部分。听起来很容易吧？以下是相关代码：

{literal}
// check to see what kind of ban is this based on the ban_until and ban_at columns in table banlist from return data of /inc/classes/bans.class.php
var banduration = {/literal}{$ban.until - $ban.at}{literal};
if (banduration !== 1 || 0) {
    var bantype = ((banduration < 0 || banduration > 3600) ? "ban" : "warning");
}
// replace all classnames with others in case this is a warning/ban, and END the script before it also changes modnames
if (bantype === "warning" || "ban") {
            document.getElementbyId("modname_message_background").className = "common_background " + bantype + "_background";
            document.getElementById("modname_message_bottomribbon").className = "common_bottomribbon " + bantype + "_bottomribbon";
            document.getElementById("modname_message_letterbox").className = "common_letterbox " + bantype + "_letterbox";
            document.getElementById("modname_message_modname").className = "common_modname " + bantype + "_modname";
            document.getElementById("modname_message_servertime").className = "common_servertime " + bantype + "_servertime";
            document.getElementById("modname_message_signature").className = "common_signature " + bantype + "_signature";
            document.getElementById("modname_message_topribbon").className = "common_topribbon " + bantype + "_topribbon";
            document.getElementById("modname_message_username").className = "common_username " + bantype + "_username";
        }

这是不言自明的：这是在Smarty模板中，$ban.until是禁令结束的统一时间，$ban.at是被实施禁令的统一时间，依此类推。但是，当我运行此脚本时，该脚本旨在根据各个主持人级别（后来我离题）和消息类型（消息，警告或禁止）来更改禁止消息。当我插入此代码时，仅使用第一行。我激动不安，花了两个小时以不同的方式对其进行了多次重做，但完全没有用。我对自己大为恼火，写道：

if (bantype == "warning" || "ban") {
    var list = ["modname_message_background","modname_message_bottomribbon","modname_message_letterbox","modname_message_modname","modname_message_servertime","modname_message_signature","modname_message_topribbon","modname_message_username"];
    var secondlist = ["background","bottomribbon","letterbox","modname","servertime","signature","topribbon","username"];
    for (var i=0;i<list.length;i++) {
    document.getElementById(list[i]).className = "common_" + secondlist[i] + " " + bantype + "_" + secondlist[i];
    }
}
return;

这也不起作用。我真是难以置信-失败了，我来到这里，是为我不得不错过的荒谬而简单的错误而恳求的，因为只有如此简单的事情才会如此令人讨厌。

我可以确认变量banduration是否工作正常（使用alert）。

最佳答案

if (bantype === "warning" || "ban")

不按照您的想法去做。等效于：

if ((bantype === "warning") || "ban")

这总是正确的，因为"ban"不是错误的。它应该是：

if (bantype === "warning" || bantype === "ban")

和：

if (banduration !== 1 || 0)

应该：

if (banduration !== 1 && banduration !== 0)