質問編集履歴
3
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@@ -16,6 +16,7 @@
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console.log(p.yearOfBirth());
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```
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```JavaScript
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function person(name, age) {
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this.name= name;
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@@ -58,14 +58,4 @@
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console.log(p.yearOfBirth);
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1
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@@ -2,7 +2,6 @@
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2
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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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this.name= name;
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@@ -17,7 +16,7 @@
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console.log(p.yearOfBirth());
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```JavaScript
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function person(name, age) {
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this.name= name;
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this.age = age;
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console.log(p.yearOfBirth)
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```
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-
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```JavaScript
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function person(name, age) {
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this.name= name;
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this.age = age;
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39
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-
this.yearOfBirth = bornYear();
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40
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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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this.name= name;
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this.age = age;
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this.yearOfBirth = function(n) {
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55
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return 2019 - n;
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}
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@@ -60,8 +45,8 @@
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console.log(p.yearOfBirth(22));
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-
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```
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```JavaScript
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function person(name, age) {
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this.name= name;
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this.age = age;
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@@ -73,4 +58,14 @@
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console.log(p.yearOfBirth);
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```
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```
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