質問編集履歴
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console.log(p.yearOfBirth());
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```JavaScript
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3
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下記の4つのコードの違いとベストな書き方が知りたいです。
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たとえば1つ目のbornYear()はなぜthisでpersonを取得できるのか不思議です。
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```JavaScript
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function person(name, age) {
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function person(name, age) {
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this.name= name;
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```JavaScript
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this.yearOfBirth = bornYear();
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}
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function bornYear() {
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return 2019 - this.age;
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}
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var p = new person("A", 22);
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console.log(p.yearOfBirth());
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function person(name, age) {
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```
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```JavaScript
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function person(name, age) {
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```
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```
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