📜  Lodash _.isNegative() 方法

📅  最后修改于: 2022-05-13 01:56:52.979000             🧑  作者: Mango

Lodash _.isNegative() 方法

Lodash _.isNegative() 方法检查给定值是否为负值并返回相应的布尔值。

句法:

_.isNegative( value );

参数:此方法采用单个参数,如上所述,如下所述:

  • value:要检查负值的给定值。

返回值:如果给定值为 Negative,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 _.isNegative() method
console.log("The Value is Negative : " + _.isNegative(-500)); 
  
console.log("The Value is Negative : " + _.isNegative(500)); 
  
console.log("The Value is Negative : " + _.isNegative('G'));


Javascript
// Defining lodash contrib variable 
var _ = require('lodash-contrib'); 
  
// Checking for _.isNegative() method
console.log("The Value is Negative : " + _.isNegative(-10.5)); 
  
console.log("The Value is Negative : " + _.isNegative(10.5)); 
  
console.log("The Value is Negative : " + _.isNegative({}));


输出:

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 _.isNegative() method
console.log("The Value is Negative : " + _.isNegative(-10.5)); 
  
console.log("The Value is Negative : " + _.isNegative(10.5)); 
  
console.log("The Value is Negative : " + _.isNegative({}));

输出:

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