`forEach` 函数中的 `return` 关键字是什么意思？ [复制]

$('button').click(function () {
   [1, 2, 3, 4, 5].forEach(function (n) {
      if (n == 3) {
         // it should break out here and doesn't alert anything after
         return false
      }
      alert(n)      
   })
})

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button>Click me</button>

我的问题：为什么我拨打后仍然提示下一个号码return？就像：忽略下面的代码并继续下一个元素

来自Mozilla 开发者网络 https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach#Description:

没有办法阻止或打破forEach()除了抛出异常之外的循环。如果您需要这样的行为，forEach()方法是错误的工具。

提前终止可以通过以下方式完成：

• 一个简单的循环
• A for...of https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of loop
• Array.prototype.every() https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every
• Array.prototype.some() https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some
• Array.prototype.find() https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find
• Array.prototype.findIndex() https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex

其他数组方法：every() https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every, some() https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some, find() https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find, and findIndex() https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex使用返回真值的谓词测试数组元素，以确定是否需要进一步迭代。