Javascript 在几分钟内领先零
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Leading zeros in minutes
提问by charlie
I created a clock to be placed in the header of my website. The time is not displaying a zero for minutes < 10. For example if the time is 10:50, it will only show 10:5 ,I found a solution but unsure of how to implement it. Also if there is a better method please share.
我创建了一个时钟，放置在我网站的标题中。时间在分钟 < 10 内不显示零。例如，如果时间是 10:50，它只会显示 10:5 ，我找到了一个解决方案，但不确定如何实现它。另外如果有更好的方法请分享。
var current;
window.onload = function () {
current = new Date();
document.getElementById("clock").innerHTML = current.getHours() + ":" + current.getMinutes();
This is what I need
这就是我需要的
if (minutes < 10)
minutes = "0" + minutes
and this is the container for my clock
这是我的时钟的容器
<span id="clock"> </span>
回答by Pete
You can just grab the first 5 characters of the time string.
您可以只获取时间字符串的前 5 个字符。
(new Date()).toTimeString().substr(0,5)
回答by Tomasz Nurkiewicz
And what is your issue?
你的问题是什么？
var minutes = (current.getMinutes() < 10? '0' : '') + current.getMinutes();
Since you'll have the same problem with hours, wrap it in a small utility function:
由于您会遇到与小时相同的问题，请将其包装在一个小的实用程序函数中：
function pad(var value) {
if(value < 10) {
return '0' + value;
} else {
return value;
}
}
And later simply:
后来简单地说：
pad(current.getHours()) + ":" + pad(current.getMinutes())
回答by Plynx
Since you're likely to run into presentational issues in the future along the same lines, I'd recommend picking a favorite string formattingfunction for Javascript.
由于您将来可能会遇到同样的问题，我建议您为 Javascript选择一个最喜欢的字符串格式化函数。
Some examples:
一些例子：
- http://www.masterdata.se/r/string_format_for_javascript/
- http://www.diveintojavascript.com/projects/javascript-sprintf
- http://www.masterdata.se/r/string_format_for_javascript/
- http://www.diveintojavascript.com/projects/javascript-sprintf
Then you can do something like "{0:00}:{1:00}".format(current.getHours(), current.getMinutes())or even better,
然后你可以做类似"{0:00}:{1:00}".format(current.getHours(), current.getMinutes())甚至更好的事情，
var d = new Date();
var s = d.format("hh:mm:ss tt");
// Result: "02:28:06 PM"
回答by dmo
I like this way of doing things... Javascript add leading zeroes to date
我喜欢这种做事方式... Javascript 添加前导零迄今为止
const d = new Date();
const date = (`0${d.getMinutes()}`).slice(-2);
console.log(date); // 09;
2019 Update:But I now prefer
2019 年更新：但我现在更喜欢
const d = new Date();
const date = String(d.getMinutes()).padStart(2, '0');
console.log(date); // 09;
回答by Krtek
I tried this way. It's not brief but it works.
我试过这种方式。这不是简短的，但它的工作原理。
var dt = new Date();
if (parseInt(dt.getMinutes()) < 10) {minutes = "0" + dt.getMinutes();} else minutes = dt.getMinutes();
if (parseInt(dt.getSeconds()) < 10) {seconds = "0" + dt.getSeconds();} else seconds = dt.getSeconds();
var time = dt.getHours() + ":" + minutes + ":" + seconds;
document.write("Now is:" + time);
//Result: Now is: 22:47:00
I hope it will be useful
我希望它会很有用
