我正在开发一个小项目，我必须在其中显示当前日期。我需要根据变量字符串的最后一个字母添加 nth、st 等，但是当我在 Web 浏览器中检查 HTML 文件时，该字符串没有不出现。这是我的代码:
window.onload = function() {
startDate();
}
function startDate() {
var month = [
"January",
"February",
"March",
"April",
"May",
"June",
"July",
"August",
"September",
"October",
"November",
"December"
];
var weekDay = [
"Sunday",
"Monday",
"Tuesday",
"Wednesday",
"Thursday",
"Friday",
"Saturday"
];
var date = today.getDate();
date = checkDate(date);
document.getElementById("date").innerHTML = weekDay[today.getDay()] + " the " + date + " of " + month[today.getMonth()];
}
function checkDate(i) {
if (i.slice(-1) == 1 && i !== 11) {
i = i + "st";
} else if (i.slice(-1) == 2 && i !== 12) {
i = i + "nd";
} else if (i.slice(-1) == 3 && i !== 13) {
i = i + "rd";
} else {
i = i + "th";
}
return i;
}
这是我的 HTML:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="style.css" />
</head>
<body>
<div id="container">
<div id="date"></div>
</div>
<script src="script.js"></script>
</body>
</html>
最佳答案
您的代码存在一些问题。首先你如何定义“今天”？其次，Number 对象上没有定义切片函数。通过这两项编辑您的工作代码:
window.onload = function() {
startDate();
};
function startDate() {
var month = [
"January",
"February",
"March",
"April",
"May",
"June",
"July",
"August",
"September",
"October",
"November",
"December"
];
var weekDay = [
"Sunday",
"Monday",
"Tuesday",
"Wednesday",
"Thursday",
"Friday",
"Saturday"
];
var today = new Date();
var date = today.getDate();
date = checkDate(String(date));
document.getElementById("date").innerHTML = weekDay[today.getDay()] + " the " + date + " of " + month[today.getMonth()];
}
function checkDate(i) {
if (i.slice(-1) == 1 && i !== 11) {
i = i + "st";
} else if (i.slice(-1) == 2 && i !== 12) {
i = i + "nd";
} else if (i.slice(-1) == 3 && i !== 13) {
i = i + "rd";
} else {
i = i + "th";
}
return i;
}
关于javascript - 如果同一变量等于字符串，则更改变量的值，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37779003/