1.可以通过prototype属性，实现继承方法的方式，这种方式就是java语言中继承的变换形式。
// Create the constructor for a Person object
function Person( name ) {
this.name = name;
}
// Add a new method to the Person object
Person.prototype.getName = function() {
return this.name;
};
Person.prototype.setName = function(name) {
this.name = name;
};
// Create a new User object constructor
function User( name, password ) {
// Notice that this does not support graceful overloading/inheritance
// e.g. being able to call the super class constructor
this.name = name;
this.password = password;
};
// The User object inherits all of the Person object's methods
User.prototype = new Person();
2.通过自己写继承函数，实现继承，下面这段代码也很好，值得一看
// A simple helper that allows you to bind new functions to the
// prototype of an object
Function.prototype.method = function(name, func) {
this.prototype[name] = func;
return this;
};
// A (rather complex) function that allows you to gracefully inherit
// functions from other objects and be able to still call the 'parent'
// object's function
Function.method('inherits', function(parent) {
// Keep track of how many parent-levels deep we are
var depth = 0;
// Inherit the parent's methods
var proto = this.prototype = new parent();
// Create a new 'priveledged' function called 'uber', that when called
// executes any function that has been written over in the inheritance
this.method('uber', function uber(name) {
var func; // The function to be execute
var ret; // The return value of the function
&n
在js中，每个对象都有一个prototype属性：返回对象类型原型的引用。很拗口！习语“依葫芦画瓢”，这里的葫芦就是原型，那么“瓢.prototype” 返回的就是葫芦，或者“瓢.prototype= new 葫芦()”。
prototype的用途：
继承
有一个对象－－子类：
function 子类() {
this.lastname = ......
二十、Bookmarklet
1、什么是Bookmarklet？（What's a Bookmarklet?）
Q：什么是Bookmarklet？
A：Bookmarklet是整个都被包含在超链接URL中的一小段JavaScript程序。（JavaScript URL就是这个样子：<a href="javascript:the code goes here">。）多数浏览器允许用户添加这些JavaScript URL书签，就像添加其他超链� ......
