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JS克隆,属性,数组,对象,函数实例分析

  • 时间:2020-01-04 00:12 编辑: 来源: 阅读:
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摘要:JS克隆,属性,数组,对象,函数实例分析
本文实例讲述了JS克隆,属性,数组,对象,函数。分享给大家供大家参考,具体如下:
<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: 'default name',
 getName: function() {
  return this.name;
 }
};
var reader = clone(Person);
console.log(reader.getName()); // This will output 'default name'.
reader.name = 'John Smith';
console.log(reader.getName()); // This will now output 'John Smith'.
/* 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 = 'Dustin Diaz';
author[0].books = ['JavaScript Design Patterns'];
author[1] = clone(Author);
author[1].name = 'Ross Harmes';
author[1].books = ['JavaScript Design Patterns','PHP','Mysql'];
console.log(author[0].getName());
console.log(author[0].getBooks());
console.log(author[1].getName());
console.log(author[1].getBooks());
</script>

结果 [img]http://files.jb51.net/file_images/article/201611/20161126114635812.png?20161026114854[/img] 这里的console.log很有意思,比alert有意思,alert不能获取全部数据,需要一个个弹出。 js的数组定义也很有意思。 进一步升级
<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: 'default name',
 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 'default name'.
authorClone.name = 'new name'; // 重新赋值
console.log(authorClone.name); // Now linked to the primative authorClone.name, which
// is the string 'new name'.
console.log(Author.getName()); // 没有改变,任然是 'default name'
console.log(Author.getBooks()); // 空的
authorClone.books.push('new book'); // Author被改了
authorClone.books.push('new new book'); // Author被改了
console.log(Author.getBooks()); // array 'new book'
console.log(authorClone.getBooks()); // array 'new book'
authorClone.books = []; // 定义了属于自己的books数组
authorClone.books.push('new book2'); // We are now modifying that new array.
authorClone.books.push('new book3');
authorClone.books.push('new book4');
console.log(authorClone.getBooks());
console.log(Author.getBooks());
var CompoundObject = {
 string1: 'default value',
 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>

结果: [img]http://files.jb51.net/file_images/article/201611/20161126114900503.png?20161026115010[/img] 更多关于JavaScript相关内容可查看本站专题:《[url=http://www.1sucai.cn/Special/722.htm]JavaScript常用函数技巧汇总[/url]》、《[url=http://www.1sucai.cn/Special/85.htm]javascript面向对象入门教程[/url]》、《[url=http://www.1sucai.cn/Special/313.htm]JavaScript中json操作技巧总结[/url]》、《[url=http://www.1sucai.cn/Special/502.htm]JavaScript切换特效与技巧总结[/url]》、《[url=http://www.1sucai.cn/Special/472.htm]JavaScript查找算法技巧总结[/url]》、《[url=http://www.1sucai.cn/Special/462.htm]JavaScript动画特效与技巧汇总[/url]》、《[url=http://www.1sucai.cn/Special/439.htm]JavaScript错误与调试技巧总结[/url]》、《[url=http://www.1sucai.cn/Special/297.htm]JavaScript数据结构与算法技巧总结[/url]》、《[url=http://www.1sucai.cn/Special/281.htm]JavaScript遍历算法与技巧总结[/url]》及《[url=http://www.1sucai.cn/Special/119.htm]JavaScript数学运算用法总结[/url]》 希望本文所述对大家JavaScript程序设计有所帮助。
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