如何将HTML输入值的数据类型更改为整数? [英] How can I change an HTML input value's data type to integer?

问题描述

我正在使用jQuery检索由输入按钮提交的值.该值应为整数.我想将其递增一并显示.

I'm using jQuery to retrieve a value submitted by an input button. The value is supposed to be an integer. I want to increment it by one and display it.

// Getting immediate Voting Count down button id
var countUp = $(this).closest('li').find('div > input.green').attr('id');
var count = $("#"+countUp).val() + 1;
alert (count);

上面的代码给了我一个串联的字符串.假设值是3.我想获得4作为输出，但是代码产生31.

The above code gives me a concatenated string. Say for instance the value is 3. I want to get 4 as the output, but the code produces 31.

如何将HTML输入值的数据类型更改为整数?

How can I change an HTML input value's data type to integer?

推荐答案

要将strValue转换为整数，请使用:

To convert strValue into an integer, either use:

parseInt(strValue, 10);

或一元+运算符.

+strValue

请注意parseInt的基数参数，因为前导0将导致parseInt假定输入为八进制，而输入010的值将为8而不是10

Note the radix parameter to parseInt because a leading 0 would cause parseInt to assume that the input was in octal, and an input of 010 would give the value of 8 instead of 10

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