如何在 div 中调用<p> id？

Question

所以我试图创建一个每日消息。分区代码<div class="motd" id="shadowbox">    <h4 class="rainbow_text_animated" style="text-align: center;" >Message of the Day</h4>    <p id="MOTDText" style="text-align: center;">nil</p>    </div>脚本 function motdupdate() {    var dailymessages = ["message1", "message2", "message3", "message4", "message5", "message6", "message7"]    var today = new Date();    if (today.getDay() == 0 ) document.getElementById(motd.MOTDText).innerHTML = dailymessages[0];    else if (today.getDay() == 1 ) document.getElementById(motd.MOTDText).innerHTML = dailymessages[1];    else if (today.getDay() == 2 ) document.getElementById(motd.MOTDText).innerHTML = dailymessages[2];    else if (today.getDay() == 3 ) document.getElementById(motd.MOTDText).innerHTML = dailymessages[3];    else if (today.getDay() == 4 ) document.getElementById(motd.MOTDText).innerHTML = dailymessages[4];    else if (today.getDay() == 5 ) document.getElementById(motd.MOTDText).innerHTML = dailymessages[5];    else if (today.getDay() == 6 ) document.getElementById(motd.MOTDText).innerHTML = dailymessages[6]; }问题是，它一直给我这个错误：index.html:59 Uncaught ReferenceError: motd is not defined    at motdupdate (index.html:59)    at <anonymous>:1:1如何解决此问题？

Answer 1

getElementById(motd.MOTDText)

应该是

getElementById("MOTDText").innerHTML = dailymessages[6];

它们都应该更改为此才能正常工作。

Answer 2

首先，我认为今天.getDay（）永远不会等于0。我不明白为什么你想这样称呼，因为在公共ID中必须是唯一的，所以你可能不依赖于div。试试像这样：

function motdupdate() {

    var dailymessages = ["message1", "message2", "message3", "message4", "message5", "message6", "message7"]

    var today = new Date();

     document.getElementById("MOTDText").innerHTML = dailymessages[ parseInt(today.getDay() - 1)];

 }