什么是"..."(3个点)在javascript中? [英] What is "..." (3 dots) in javascript?

问题描述

我从了解了这件事这篇文章.

function StoreMixin(...stores) { // what is "..."
  var Mixin = {
    getInitialState() {
      return this.getStateFromStores(this.props);
    },
    componentDidMount() {
      stores.forEach(store =>
        store.addChangeListener(this.handleStoresChanged)
      );
      this.setState(this.getStateFromStores(this.props));
    },
    componentWillUnmount() {
      stores.forEach(store =>
        store.removeChangeListener(this.handleStoresChanged)
      );
    },
    handleStoresChanged() {
      if (this.isMounted()) {
        this.setState(this.getStateFromStores(this.props));
      }
    }
  };
  return Mixin;
}

请通过示例代码解释什么是"...".谢谢！

Please kindly explain what is "...", with example code. Thanks!

推荐答案

在该示例中， ... 是

In that example, the ... is a Rest parameter, a syntax allows us to represent an indefinite number of arguments as an array.

它有点相似(或不相似:)，但与

It is somewhat similar (or not :), but it's not the same as the spread syntax.

在您的示例中，内部的 stores 参数是一个数组.如果像 StoreMixin(1,2,3)这样调用 StoreStorexin(... stores)函数，则 stores 将是 [1，2、3] 等.

In your example, the stores argument inside is an array. If function StoreMixin(...stores) is called like StoreMixin(1,2,3) then stores will be [1, 2, 3] and so on.

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