Question

我试图在点击按钮时显示昨天日期，但为什么将日期显示为“2013-6-0” 而不是2013-05-31

有人可以告诉我我做错了吗

<!DOCTYPE html>
<html>
<head>
<script>
function displayDate()
{

var d = new Date();
var curr_date = d.getDate()-1;
var curr_month = d.getMonth() + 1;
var curr_year = d.getFullYear();
var yesterday = curr_year + "-" + curr_month + "-" + curr_date ;

document.write(yesterday);

}
</script>
</head>
<body>


<p id="demo">Click Button to Display Yesterday Date</p>

<button type="button" onclick="displayDate()">Display Date</button>

</body>
</html>

Answer 1

您应该更新，然后参考您减去1天的日期：

var d = new Date();

d.setDate(d.getDate() - 1); // <-- add this to make it "yesterday"

var curr_date = d.getDate(); // <-- don't subtract 1 anymore
var curr_month = d.getMonth() + 1;
var curr_year = d.getFullYear();

<强> DEMO

Answer 2

您的代码只需要一天的数字（如1,2，......）并从中减去一个。为什么你会期望自动将这一天回滚到上个月？

您可以通过从给定日期减去毫秒来生成新日期。试试这个：

var today = new Date();
# subtract milliseconds representing one day from current date
var yesterday = new Date(today - 24*60*60*1000);

Answer 3

var today = new Date();
var yesterday = new Date();
yesterday.setDate(today.getDate()-1);

var yesterdayStr = yesterday.getFullYear() + "-" + (yesterday.getMonth()+1) + "-" + yesterday.getDate();

Answer 4

function displayDate()
{
    var today = new Date();
    today.setDate(today.getDate()-1);
    var yyyy = today.getFullYear().toString();
    var mm = (today.getMonth()+1).toString();         
    mm = mm.length==2?mm:"0"+mm;
    var dd = today.getDate().toString();
    dd = dd.length==2?dd:"0"+dd;
    var yesterday = yyyy+"-"+mm+"-"+dd;

    document.write(yesterday);
}

JavaScript：在JavaScript中显示昨天的日期

4 个答案: