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JS克隆，属性，数组，对象，函数实例分析

2016-11-26 11:37 871 查看

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

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：

希望本文所述对大家JavaScript程序设计有所帮助。

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标签： JS 克隆属性数组对象函数

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