📜  Lodash _.isNumeric() 方法

📅  最后修改于: 2022-05-13 01:56:54.241000             🧑  作者: Mango

Lodash _.isNumeric() 方法

Lodash _.isNumeric() 方法检查给定值是否为数值并返回相应的布尔值。它可以是包含数值、指数符号或 Number 对象等的字符串。

句法:

_.isNumeric( value );

参数:此方法采用单个参数,如上所述,如下所述:

  • value:要检查数值的给定值。

返回值:如果给定值是数字,则此方法返回布尔值 true,否则返回 false。

注意:这在普通 JavaScript 中不起作用,因为它需要安装 lodash.js contrib 库。 Lodash.js contrib 库可以使用npm install lodash-contrib 安装

示例 1:

Javascript
// Defining lodash contrib variable 
var _ = require('lodash-contrib'); 
  
// Checking for _.isNumeric() method
console.log("The Value is Numeric : " + _.isNumeric(10000));  
  
console.log("The Value is Negative : " + _.isNumeric(10.5)); 
  
console.log("The Value is Negative : " + _.isNumeric('G')); 
  
console.log("The Value is Negative : " + _.isNumeric('Geeks'));


Javascript
// Defining lodash contrib variable 
var _ = require('lodash-contrib'); 
  
// Checking for _.isNumeric() method
console.log("The Value is Numeric : " + _.isNumeric([1,10]));  
  
console.log("The Value is Negative : " + _.isNumeric("500")); 
  
console.log("The Value is Negative : " + _.isNumeric({})); 
  
console.log("The Value is Negative : " + _.isNumeric(null));


输出:

The Value is Numeric : true
The Value is Negative : true
The Value is Negative : false
The Value is Negative : false

示例 2:

Javascript

// Defining lodash contrib variable 
var _ = require('lodash-contrib'); 
  
// Checking for _.isNumeric() method
console.log("The Value is Numeric : " + _.isNumeric([1,10]));  
  
console.log("The Value is Negative : " + _.isNumeric("500")); 
  
console.log("The Value is Negative : " + _.isNumeric({})); 
  
console.log("The Value is Negative : " + _.isNumeric(null));

输出:

The Value is Numeric : false
The Value is Negative : true
The Value is Negative : false
The Value is Negative : false