我不斷收到錯誤
"Cannot read properties of undefined (reading '2') at script.js:18:47"
除非我把它放在一個 if 函式中。
這是陣列
['title','title',new Date("2022-03-26T10:00:00-06:00"),new Date("2022-04-02T10:00:00-06:00")],
['title','title',new Date("2022-04-02T10:00:00-06:00"),new Date("2022-04-09T10:00:00-06:00")],
['title', 'title', new Date("2022-04-09T10:00:00-06:00"), new Date("2022-04-16T10:00:00-06:00")],
['title', 'title', new Date("2022-04-16T10:00:00-06:00"), new Date("2022-04-23T10:00:00-06:00")],
['title', 'title', new Date("2022-04-23T10:00:00-06:00"), new Date("2022-04-30T10:00:00-06:00")],
['title', 'title', new Date("2022-04-30T10:00:00-06:00"), new Date("2022-05-07T10:00:00-06:00")],
['title', 'title', new Date("2022-05-07T10:00:00-06:00"), new Date("2022-05-14T10:00:00-06:00")],
['title', 'title', new Date("2022-05-14T10:00:00-06:00"), new Date("2022-05-21T10:00:00-06:00")],
['title', 'title', new Date("2022-05-21T10:00:00-06:00"), new Date("2022-05-28T10:00:00-06:00")]
];
不作業：
var today = Date.now();
var weeksPassed = Math.floor((today - Date.parse(nextRelease))/(24*3600*1000*7));
var latestRelease = episodeList[weeksPassed][2];
var nextRelease = episodeList[weeksPassed][3];
document.getElementById("previousEpisode").innerHTML = episodeList[weeksPassed][0];
document.getElementById("nextEpisode").innerHTML = episodeList[weeksPassed][1]
作品：
var nextRelease = new Date("2022-03-26T10:00:00-06:00");
var today = Date.now();
if (today > nextRelease) {
var weeksPassed = Math.floor((today - Date.parse(nextRelease))/(24*3600*1000*7));
latestRelease = episodeList[weeksPassed][2];
nextRelease = episodeList[weeksPassed][3];
document.getElementById("previousEpisode").innerHTML = episodeList[weeksPassed][0];
document.getElementById("nextEpisode").innerHTML = episodeList[weeksPassed][1]
};
uj5u.com熱心網友回復：
我不太擅長 JavaScript，但我認為你在使用下一個版本時沒有正確初始化它，所以會拋出一個例外，從那一行級聯
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標籤：javascript 日期