JavaScript类型转换不是数字
我有一个包含日期的数据属性的div。当我检索所述数据值时，它不是日期，而是字符串：
<div id="firstRow" class="form-group" data-expense-date="5/3/2016">
<span>some stuff in here</span>
</div>
我正在检索数据元素，如下所示：
var currentDateString = $(this).data('expense-date');
然后我尝试将值拆分为字符串数组：
var currentDateArray = currentDateString.split("/");
然后我将数组的一部分指定为我想要创建的日期的变量：
var year = Number(currentDateArray[2].toString());
var month = Number(currentDateArray[0].toString());
var day = Number(currentDateArray[1].toString());
有趣的是，我的三个变量都说他们是NaN。因此，我的新Date变量的声明是＆＃34; Invalid Date＆＃34;：
var currentDate = new Date(year, month - 1, day);
我可以执行以下操作并且工作正常：
var dateString = "5/3/2016";
var dateStringArray = dateString.split("/");
var testDate = new Date(dateStringArray[2], dateStringArray[0] - 1, dateStringArray[1]);
只有当我从div元素中读取data属性时才将值设置为我不知道它是什么。
我在Visual Studio中进行调试，这是我的立即窗口试图测试值的屏幕截图：
以下是完整示例...我的HTML：
<div class="col-md-6" id="detailPreview">
<div class="panel panel-transparent" data-expense-date="5/2/2016">
<div class="panel-heading">
<h3 class="panel-title">Monday, May 2, 2016</h3>
<div class="panel-actions">
<a class="panel-action icon wb-minus" data-toggle="panel-collapse" aria-expanded="true" aria-hidden="true"></a>
</div>
</div>
<div class="panel-body expense-date-body">
<div class="panel" data-expense-detail-id="5e18bb2b-4671-490d-8769-5d3ea08134d8">
<div class="panel-heading">
<h3 class="panel-title"><i class="icon wb-payment" aria-hidden="true"></i>Expense: Best Buy (ASUS Z555RA-3)</h3>
<div class="panel-actions">
<a class="panel-action panel-action-edit icon wb-settings" aria-hidden="true"></a>
<a class="panel-action icon wb-minus" data-toggle="panel-collapse" aria-expanded="false" aria-hidden="true"></a>
<a class="panel-action icon wb-close" data-toggle="panel-close" aria-hidden="true"></a>
</div>
</div>
<!-- <div class="panel-collapse"> -->
<div class="panel-body">
Business Name: Best Buy
Location: Topeka, KS
Purpose: Purchased replacement laptop for inventory
</div>
<!-- </div> -->
</div>
</div>
</div>
<div class="panel panel-transparent" data-expense-date="5/3/2016">
<div class="panel-heading">
<h3 class="panel-title">Tuesday, May 3, 2016</h3>
<div class="panel-actions">
<a class="panel-action icon wb-minus" data-toggle="panel-collapse" aria-expanded="true" aria-hidden="true"></a>
</div>
</div>
<div class="panel-body expense-date-body">
<div class="panel" data-expense-detail-id="49de85e2-b3ef-465d-8a61-cbc298b99d34">
<div class="panel-heading">
<h3 class="panel-title"><i class="icon wb-payment" aria-hidden="true"></i>Expense: Wal-Mart (Scotch Tape)</h3>
<div class="panel-actions">
<a class="panel-action panel-action-edit icon wb-settings" aria-hidden="true"></a>
<a class="panel-action icon wb-minus" data-toggle="panel-collapse" aria-expanded="false" aria-hidden="true"></a>
<a class="panel-action icon wb-close" data-toggle="panel-close" aria-hidden="true"></a>
</div>
</div>
<!-- <div class="panel-collapse"> -->
<div class="panel-body">
Business Name: Wal-Mart
Location: Topeka, KS
Purpose: Purchased scotch tape
</div>
<!-- </div> -->
</div>
</div>
</div>
</div>
我的javascript：
$("[data-expense-date]").each(function () {
if ($(this).data('expense-date') === dateShort.toString()) {
parentDiv = $(this);
return false;
} else {
debugger;
// determine if this date is before or after the param date.
//var dataExpenseDate = $(this).data('expense-date');
var currentDateString = $(this).data('expense-date'); // "5/2/2016"
var currentDateArray = currentDateString.split('/'); // [5,2,2016]
//var yearString = currentDateArray[2];
//var yearNumber = Number(yearString);
var year = Number(currentDateArray[2]); // "2016" <-- NaN
var month = Number(currentDateArray[0]); // "5" <-- NaN
var day = Number(currentDateArray[1]); // "3" <-- NaN
var currentDate = new Date(year, month - 1, day); // Invalid Date
if (date > currentDate) {
newDivInjectAfter = $(this);
}
}
});
更新
这只发生在我使用Internet Explorer（11）时。 Edge，Opera，FireFox和Chrome，ALL正确解析值。感谢所有回复人员，但我相信我发现了IE的错误。
3 个答案:
答案 0 :(得分：0)
使用$('#firstRow').attr('data-expense-date')选择器获取data-expense-date属性。
＆＃13;
＆＃13;
＆＃13;
＆＃13;
$(function() {
var
currentDateString = $('#firstRow').attr('data-expense-date'),
currentDateArray = currentDateString.split('/'), // ['5', '3', '2016']
year = +currentDateArray[2].toString(), // 2016
month = +currentDateArray[0].toString(), // 5
day = +currentDateArray[1].toString(), // 3
currentDate = new Date(year, month - 1, day);
alert(currentDate); // Date {Tue May 03 2016 00:00:00 GMT+0500 (AZST)}
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="firstRow" class="form-group" data-expense-date="5/3/2016">
<span>some stuff in here</span>
</div>
答案 1 :(得分：0)
就像有人在评论中所说，我认为this可能是错误的。
只是几个笔记。
由于属性是字符串，因此根本不需要.toString()，您也不需要Date Number。只需将它们输入为字符串即可。你也可以摆脱所有的变数。
var currentDateArray = $('#firstRow').attr('data-expense-date').split('/');
alert(new Date(currentDateArray[2], currentDateArray[1], --currentDateArray[0]));<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="firstRow" class="form-group" data-expense-date="5/3/2016">
<span>some stuff in here</span>
</div>
或（不是传统方法）
var currentDateArray = $('#firstRow').attr('data-expense-date').split('/');
currentDateArray[0] --; // day -1;
currentDateArray.push(null);
alert(new(Date.bind.apply(Date, currentDateArray.reverse()))());<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="firstRow" class="form-group" data-expense-date="5/3/2016">
<span>some stuff in here</span>
</div>
更新： 我试图找到IE11错误，但无法重现它。这段代码适合我。刚刚意识到你使用美国日期格式，我的另外两个例子使用英国日期格式，所以他们需要修改。
var parentDiv;
var date = new Date();
var dateShort = date.toLocaleDateString();
$("[data-expense-date]").each(function() {
if ($(this).data('expense-date') === dateShort) {
parentDiv = $(this);
return false;
} else {
var currentDateString = $(this).data('expense-date'); // "5/2/2016"
var currentDateArray = currentDateString.split('/'); // [5,2,2016]
var year = Number(currentDateArray[2]); // "2016" <-- NaN
var month = Number(currentDateArray[0]); // "5" <-- NaN
var day = Number(currentDateArray[1]); // "3" <-- NaN
var currentDate = new Date(year, month - 1, day); // Invalid Date
console.log(day,month,year,currentDate);
if (date > currentDate) {
newDivInjectAfter = $(this);
}
}
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="col-md-6" id="detailPreview">
<div class="panel panel-transparent" data-expense-date="5/2/2016">
<div class="panel-heading">
<h3 class="panel-title">Monday, May 2, 2016</h3>
<div class="panel-actions">
<a class="panel-action icon wb-minus" data-toggle="panel-collapse" aria-expanded="true" aria-hidden="true"></a>
</div>
</div>
<div class="panel-body expense-date-body">
<div class="panel" data-expense-detail-id="5e18bb2b-4671-490d-8769-5d3ea08134d8">
<div class="panel-heading">
<h3 class="panel-title"><i class="icon wb-payment" aria-hidden="true"></i>Expense: Best Buy (ASUS Z555RA-3)</h3>
<div class="panel-actions">
<a class="panel-action panel-action-edit icon wb-settings" aria-hidden="true"></a>
<a class="panel-action icon wb-minus" data-toggle="panel-collapse" aria-expanded="false" aria-hidden="true"></a>
<a class="panel-action icon wb-close" data-toggle="panel-close" aria-hidden="true"></a>
</div>
</div>
<!-- <div class="panel-collapse"> -->
<div class="panel-body">
Business Name: Best Buy Location: Topeka, KS Purpose: Purchased replacement laptop for inventory
</div>
<!-- </div> -->
</div>
</div>
</div>
<div class="panel panel-transparent" data-expense-date="5/3/2016">
<div class="panel-heading">
<h3 class="panel-title">Tuesday, May 3, 2016</h3>
<div class="panel-actions">
<a class="panel-action icon wb-minus" data-toggle="panel-collapse" aria-expanded="true" aria-hidden="true"></a>
</div>
</div>
<div class="panel-body expense-date-body">
<div class="panel" data-expense-detail-id="49de85e2-b3ef-465d-8a61-cbc298b99d34">
<div class="panel-heading">
<h3 class="panel-title"><i class="icon wb-payment" aria-hidden="true"></i>Expense: Wal-Mart (Scotch Tape)</h3>
<div class="panel-actions">
<a class="panel-action panel-action-edit icon wb-settings" aria-hidden="true"></a>
<a class="panel-action icon wb-minus" data-toggle="panel-collapse" aria-expanded="false" aria-hidden="true"></a>
<a class="panel-action icon wb-close" data-toggle="panel-close" aria-hidden="true"></a>
</div>
</div>
<!-- <div class="panel-collapse"> -->
<div class="panel-body">
Business Name: Wal-Mart Location: Topeka, KS Purpose: Purchased scotch tape
</div>
<!-- </div> -->
</div>
</div>
</div>
</div>
答案 2 :(得分：0)
在搜索我的问题并将Internet Explorer附加到搜索后，我在这里得到了一个热门。它似乎已经使用RegEx解决了：
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