Underscore.JS - every 方法

语法

_.every(list, predicate, [context])

every 方法迭代给定元素列表，对每个元素调用谓词。如果集合中的所有值都匹配给定的谓词，它将返回 true。

示例

var _ = require('underscore');

var list = [2, 4, 6]
//Example 1. check if all numbers are even
var result = _.every(list, function(num) { return (num % 2 == 0) });
console.log(result);

list = [1, 2, 4, 6]
//Example 2. check if all numbers are even
var result = _.every(list, function(num) { return (num % 2 == 0) });
console.log(result);

将上述程序保存为 tester.js。运行以下命令以执行此程序。

命令

\>node tester.js

输出

true
false