Javascript String to int conversion [英] Javascript String to int conversion

问题描述

我在页面中嵌入了以下JS：

I have the following JS immbedded in a page:

var round = Math.round;
var id = $(this).attr("id");

var len = id.length;
var indexPos = len -1; // index of the number so that we can split this up and used it as a title

var pasType = id.substring(0, indexPos); // adult, child or infant
var ind = round(id.substring(indexPos)); // converts the string index to an integer
var number = (id.substring(indexPos) + 1); // creates the number that will go in the title
window.alert(number);

id 将类似于adult0，我需要把那个字符串分成成人和0 - 这部分工作正常。

id will be something like adult0, and I need to take that string and split it into adult and 0 - this part works fine.

当我尝试增加0时出现问题。你可以看到我使用Math.round将其转换为整数，然后加1 - 我希望在此之后0为1。但是，它似乎没有将它转换为整数，因为我得到 01 ，而不是 1 。当用adult1测试时，我得到的警告是 11 。

The problem comes in when I try to increment the 0. As you can see I use Math.round to convert it to an integer, and then add 1 to it - I expect 0 to be 1 after this. However, it doesn't seem to be converting it to integer, because I get 01, not 1. When testing this with adult1 the alert I get is 11.

我正在使用这个问题供参考，并且还试过 var number + = id.substring（indexPos）; ，打破了JS（意外标识符'+ ='）

I'm using this question for reference, and have also tried var number += id.substring(indexPos);, which breaks the JS (unexpected identifier '+=')

有谁知道我在做什么错误？有没有更好的方法呢？

Does anyone know what I'm doing wrong? Is there a better way of doing this?

推荐答案

parseInt（） function解析字符串并返回整数，10是基数或基数
[DOC]

The parseInt() function parses a string and returns an integer,10 is the Radix or Base [DOC]

var number = parseInt(id.substring(indexPos) , 10 ) + 1;

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