使用RegExp.test进行Array.some的回调

Question

这有效：

＆＃13;

＆＃13;

var animals = ["caterpillar", "dog", "bird"];
var catMatch = /cat/i;
var catFound = animals.some(function(animalName) {
  return catMatch.test(animalName);
});

console.log(catFound);

＆＃13;

＆＃13;

＆＃13;

但这不是

＆＃13;

＆＃13;

var animals = ["caterpillar", "dog", "bird"];
var catMatch = /cat/i;
var catFound = animals.some(catMatch.test);

console.log(catFound);

＆＃13;

＆＃13;

＆＃13;

为什么第二个版本不起作用？

Answer 1

RegExp.prototype.test取决于其this值。您可以将所需的this值传递给some：

var catFound = animals.some(catMatch.test, catMatch);