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

Symbol.replace - JavaScript | MDN

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Symbol.replace 这个属性指定了当一个字符串替换所匹配字符串时所调用的方法。String.prototype.replace() 方法会调用此方法。

更多信息，详见 RegExp.prototype[Symbol.replace]() 和 String.prototype.replace()。

class Replace1 {
  constructor(value) {
    this.value = value;
  }
  [Symbol.replace](string) {
    return `s/${string}/${this.value}/g`;
  }
}

console.log("foo".replace(new Replace1("bar")));
// Expected output: "s/foo/bar/g"

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