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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Symbol/split below:

Symbol.split - JavaScript | MDN

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Symbol.split 指向一个正则表达式的索引处分割字符串的方法。这个方法通过 String.prototype.split() 调用。

详情请参阅 RegExp.prototype[Symbol.split]() 和 String.prototype.split()。

class Split1 {
  constructor(value) {
    this.value = value;
  }
  [Symbol.split](string) {
    const index = string.indexOf(this.value);
    return `${this.value}${string.substring(0, index)}/${string.substring(
      index + this.value.length,
    )}`;
  }
}

console.log("foobar".split(new Split1("foo")));
// Expected output: "foo/bar"

内置通用符号 Symbol.split。

class ReverseSplit {
  [Symbol.split](string) {
    const array = string.split(" ");
    return array.reverse();
  }
}

console.log("Another one bites the dust".split(new ReverseSplit()));
// [ "dust", "the", "bites", "one", "Another" ]

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