1、对已有对象进行扩充方法和属性
var object = new Object()object.name = "zhangsan"//每个对象需要写这些语句
object.sayName = function(name){//每个对象需要写这些语句
this.name = name
}
object.sayName("lisi")
alert(object.name)
2、工厂方式创建对象
function createObject() {var object = new Object()
object.username = "zhangsan"
object.password = "123456"
object.get = function(){
alert(this.username + "," + this.password)
}
return object
}
var object1 = createObject()
var object2 = createObject()
object1.get()
object2.get()
// 带参数的构造方法
function createObject(username, password){
var object = new Object()
object.username = username
object.password = password
object.get = function(){//缺点是，多少个对象则方法就有多少个
alert(this.username + ", " + this.password)
}
return object
}
var object1 = createObject("zhangsan",123456)
object1.get()
// 最佳改进方式
function get(){//使该函数被多个对象共享
alert(this.username + ", " + this.password)
}
function createObject(username, password){//创建对象
var object = new Object()
object.username = username
object.password = password
object.get = get
return object
}
var object1 = createObject("zhangsan", "123456")
var object2 = createObject("wangwu", "654321")
object1.get()
object2.get()
3、构造函数方式创建对象
function Person(){//在执行第一行代码欠，js引擎会为我们生成一个对象
this.username = "zhangsan"
this.password = "123"
this.getInfo = function(){
alert(this.username + ", " + this.password)
}
//此处有一个隐藏的return语句，用于将之前生成对象返回。
}
var p1 = new Person()
p1.getInfo()
//带参数
function Person(username, password){
this.username = username
this.password = password
this.getInfo = function(){
alert(this.username + ", " + this.password)
}
}
var p1 = new Person("zhangsan","1234546")
p1.getInfo()
4、原型（“prototype”）方式
function Person(){}Person.prototype.username = "zhangsan"
Person.prototype.password = "123456"
Person.prototype.getInfo = function(){
alert(this.username + ", " + this.password)
}
var person = new Person()
var person2 = new Person()
person.username = "haha"
person.getInfo()
person2.getInfo()
//单纯使用原型方式定义对象无法在构造函数中为属性赋值，只能在对象生成后再去改变属性值
function Person(){}
Person.prototype.username = new Array()
Person.prototype.password = "123456"
Person.prototype.getInfo = function(){
alert(this.username + ", " + this.password)
}
var person = new Person()
var person2 = new Person()
person.username.push("zhangsan")
person.username.push("lisi")
person.password = "321"
person.getInfo()
person2.getInfo()
5、综合方式（原型+构造函数方式搭配）
function Person(){this.username = new Array()//不被多个对象共享
this.password = "123"
}
Person.prototype.getInfo = function()//被多个对象共享
{
alert(this.username + "," + this.password)
}
var p1 = new Person()
var p2 = new Person()
p1.username.push("zhangsan")
p2.username.push("lisi")
p1.getInfo()
p2.getInfo()
6、动态原型方式
function Person(){this.username = "zhangsan"
this.password = "123"
//通过标志量让所有的对象共享方法
if(typeof Person.flag == "undefined"){
alert("prototype")
Person.prototype.getInfo = function() {
alert(this.username + ", " + this.password)
}
Person.flag = true
}
}
var p = new Person()
var p2 = new Person()
p.getInfo()
p2.getInfo()
代码如下:<br><script type="text/javascript"><br>//FX获取文件路径方法 <br>function readFileFirefox(fileBrowser) { <br>try { <br>netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect")<br>} <br>catch (e) { <br>alert('无法访问本地文件，由于浏览器安全设置。为了克服这一点，请按照下列步骤操作：(1)在地址栏输入"about:config"(2) 右键点击并选择 New->Boolean(3) 输入"signed.applets.codebase_principal_support" （不含引号）作为一个新的首选项的名称(4) 点击OK并试着重新加载文件')<br>return<br>} <br>var fileName=fileBrowser.value//这一步就能得到客户端完整路径。下面的是否判断的太复杂，还有下面得到ie的也很复杂。 <br>var file = Components.classes["@mozilla.org/file/local1"] <br>.createInstance(Components.interfaces.nsILocalFile)<br>try { <br>// Back slashes for windows <br>file.initWithPath( fileName.replace(/\//g, "\\\\") )<br>} <br>catch(e) { <br>if (e.result!=Components.results.NS_ERROR_FILE_UNRECOGNIZED_PATH) throw e<br>alert("File '" + fileName + "' cannot be loaded: relative paths are not allowed. Please provide an absolute path to this file.")<br>return<br>} <br>if ( file.exists() == false ) { <br>alert("File '" + fileName + "' not found.")<br>return<br>}落伍了。。。原来js可以生成file。。。楼主能吧代码给我看看么？applet我就不清楚了。。。但是如果是servlet就可以通过获取request的流对象，拿到这个文件。。。
