JSクローン、属性、配列、オブジェクト、関数インスタンスの分析

この記事の例では、JS のクローン作成、属性、配列、オブジェクト、関数について説明します。参考までに皆さんと共有してください。詳細は次のとおりです:

<script type="text/javascript">
/* 克隆原型得到对象 */
function clone(object) {
  function F() {}
  F.prototype = object;
  return new F;
}
var Person = {
 name: &#39;default name&#39;,
 getName: function() {
  return this.name;
 }
};
var reader = clone(Person);
console.log(reader.getName()); // This will output &#39;default name&#39;.
reader.name = &#39;John Smith&#39;;
console.log(reader.getName()); // This will now output &#39;John Smith&#39;.
/* Author Prototype Object. */
var Author = clone(Person);
Author.books = []; // 书数组
Author.getBooks = function() {
 return this.books;
}
var author = [];
author[0] = clone(Author);
author[0].name = &#39;Dustin Diaz&#39;;
author[0].books = [&#39;JavaScript Design Patterns&#39;];
author[1] = clone(Author);
author[1].name = &#39;Ross Harmes&#39;;
author[1].books = [&#39;JavaScript Design Patterns&#39;,&#39;PHP&#39;,&#39;Mysql&#39;];
console.log(author[0].getName());
console.log(author[0].getBooks());
console.log(author[1].getName());
console.log(author[1].getBooks());
</script>

ここの console.log は非常に興味深いもので、Alert はすべてのデータを取得できないため、1 つずつポップアップする必要があります。

jsの配列定義も非常に興味深いです。

さらなるアップグレード

<script type="text/javascript">
/* 克隆原型得到对象 */
function clone(object) {
  function F() {}
  F.prototype = object;
  return new F;
}
var Person = {
 name: &#39;default name&#39;,
 getName: function() {
  return this.name;
 }
};
var Author = clone(Person);
Author.books = []; // 书数组
Author.getBooks = function() {
 return this.books;
}
var authorClone = clone(Author);
console.log(authorClone.name); // string &#39;default name&#39;.
authorClone.name = &#39;new name&#39;; // 重新赋值
console.log(authorClone.name); // Now linked to the primative authorClone.name, which
// is the string &#39;new name&#39;.
console.log(Author.getName()); // 没有改变，任然是 &#39;default name&#39;
console.log(Author.getBooks()); // 空的
authorClone.books.push(&#39;new book&#39;); // Author被改了
authorClone.books.push(&#39;new new book&#39;); // Author被改了
console.log(Author.getBooks()); // array &#39;new book&#39;
console.log(authorClone.getBooks()); // array &#39;new book&#39;
authorClone.books = []; // 定义了属于自己的books数组
authorClone.books.push(&#39;new book2&#39;); // We are now modifying that new array.
authorClone.books.push(&#39;new book3&#39;);
authorClone.books.push(&#39;new book4&#39;);
console.log(authorClone.getBooks());
console.log(Author.getBooks());
var CompoundObject = {
 string1: &#39;default value&#39;,
 childObject: {
  bool: true,
  num: 10
 },
 getChild: function() { // 返回对象Object
  return this.childObject;
 }
}
var compoundObjectClone = clone(CompoundObject);
compoundObjectClone.childObject.num = 5; // 不好的方式
compoundObjectClone.childObject = { // 好一点的方式
 bool: true,
 num: 5
};
console.log(compoundObjectClone.getChild());
</script>