Community Learn Tools Library Leisure
search
English
Home > Web Front-end > JS Tutorial > js如果强制转化一个非数字的值为number,会得到一个NaN的值

js如果强制转化一个非数字的值为number,会得到一个NaN的值

WBOY
Release： 2016-06-01 09:55:04
Original
1676 people have browsed it

我们大家都知道，在js中，只需要在变量值前面加上变量类型，就可以将变量强制转化为对应的类型。如var a="11"; 那么number(a)是将字符串"11"转换为整形11。 但是，当变量为非数字值时，又会出现什么结果呢？

请看实例：

var a="11";

var b=number(a); 变量b的值为整形11.

但是，如果变量值为非数字时，将返回NaN

如：

var c="sd";

var d=number(c); 变量d的值为NaN

 

小结：

通过此实例，我们可以利用NaN的值来判断变量值是否为数字值。

 

 

Related labels：
int isnan Convert
source：php.cn
Previous article：js setTimeout函数用法实例 Next article：js indexOf 函数用法实例
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
PX automatic conversion to REM error  <style>html {   font-size: calc(100vw / 3.75);      }...
From 2024-04-16 09:34:16
0
0
4687
Dynamically modify inline CSS styles in Javafx I'm trying to change the background image of a pane when the application is maximized. My ...
From 2024-04-06 20:57:16
0
1
487
Using variables defined in methods in templates This is my first time using Vue (v2 not v3) and I've been trying to use variables inside t...
From 2024-04-06 18:10:25
0
2
513
CSS styles not applied to site I'm making a website using Bootstrap5 but the index.css properties are not being applied t...
From 2024-04-06 17:12:23
0
1
336
Why does omitting 0ms sleep break my css transitions? I'm trying to implement a FLIP animation to see if I understand it correctly. In this code...
From 2024-04-06 16:29:50
0
2
490
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template