Lodash _.isNumeric()方法檢查給定值是否為數值,並返回相應的布爾值。它可以是包含數字值, index 符號或Number對象等的字符串。
用法:
_.isNumeric( value );
參數:該方法采用上述和以下描述的單個參數:
- value:給定值,用於檢查數值。
返回值:如果給定值為Numeric,則此方法返回布爾值true,否則返回false。
注意:由於它需要安裝lodash.js contrib庫,因此在常規JavaScript中將無法使用。可以使用npm install lodash-contrib來安裝Lodash.js contrib庫。
範例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'));
輸出:
The Value is Numeric:true The Value is Negative:true The Value is Negative:false The Value is Negative:false
範例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));
輸出:
The Value is Numeric:false The Value is Negative:true The Value is Negative:false The Value is Negative:false
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注:本文由純淨天空篩選整理自AshokJaiswal大神的英文原創作品 Lodash _.isNumeric() Method。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。