ES6 中 Symbol.split的用法

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class Split1 {   constructor(value) {     this.value = value;   }   [Symbol.split](string) {     var index = string.indexOf(this.value);     return this.value + string.substr(0, index) + "/"       + string.substr(index + this.value.length);   } }   console.log('foobar'.split(new Split1('foo'))); // expected output: "foo/bar"

　　原文： https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/split