jQuery:从ID获取号码 [英] Jquery: Getting the number from ID

问题描述

您在另一个问题中提到了此问题: jquery从id获取编号

You mentioned this in another question: jquery get number from id

您应该养成在属性名称(即button-1，button_1)中使用定界符的习惯.许多优点之一是，它使从字段中提取数字或其他信息变得更加容易(例如，通过在'-'处拆分字符串).

You should get in the habit of using delimiters in your attribute names (ie, button-1, button_1). One of the advantages, of many, is that it makes it easier to extract a number, or some other information, from the field (ie, by splitting the string at '-').

如果在属性名称中使用定界符，您将如何提取数字?

How would you extract the number if you are using a delimiter in your attribute names?

谢谢！

推荐答案

1. .attr('id')可用于检索ID属性.
2. 然后，使用.split函数用分隔符分隔字符串.
3. 从索引[1]获取编号.

1. .attr('id') can be used to retrieve the ID attribute.
2. Then, use the .split function to split the string by a separator.
3. Get the number from index [1].

代码:

 var delimiter = '-';
 var num = $("element").attr('id').split(delimiter)[1];
 // Expected format: <anything 1>-<anything 2>
 // Note that <anything 2> is not necessarily a number

以前的方法非常依赖于id格式.一个更可靠的方法是regexp:

The previous method is very dependent on the id format. A more solid method is a regexp:

var num = /\d+/.exec($("element").attr('id')); // Selects all consecutive digits
// Examples:
//  button_1 = 1    button2 = 2     1st = 1     button4--5 = 4

要匹配末尾的数字，请使用:

To match the digits at the end, use:

var num = /\d+(?=\D*$)/.exec($("element").attr('id'));

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