使用JScript.NET制作asp.net网页基础教程4
2024-07-10 12:54:52
供稿：网友
在jscript中定义类通过类声明, 包含方法和对象和var 声明。对于类的派生通过下面两个程序的对比，你讲清楚地明白。
jscript 5.5 code
// simple object with no methods
function car(make, color, year)
{
this.make = make;
this.color = color;
this.year = year;
}
function car.prototype.getdescription()
{
return this.year + " " + this.color + " " + this.make;
}
// create and use a new car object
var mycar = new car("accord", "maroon", 1984);
print(mycar.getdescription());
jscript.net code
// wrap the function inside a class statement.
class car
{
var make : string;
var color : string;
var year : int;
function car(make, color, year)
{
this.make = make;
this.color = color;
this.year = year;
}
function getdescription()
{
return this.year + " " + this.color + " " + this.make;
}
}
var mycar = new car("accord", "maroon", 1984);
print(mycar.getdescription());
jscript.net还支持定义private和protected property通过get和set进行读写。
如下例：
class person
{
private var m_sname : string;
private var m_iage : int;
function person(name : string, age : int)
{
this.m_sname = name;
this.m_iage = age;
}
// name 只读
function get name() : string
{
return this.m_sname;
}
// age 读写但是只能用set
function get age() : int
{
return this.m_sage;
}
function set age(newage : int)
{
if ((newage >= 0) && (newage <= 110))
this.m_iage = newage;
else
throw newage + " is not a realistic age!";
}
}
var fred : person = new person("fred", 25);
print(fred.name);
print(fred.age);
// 这将产生一个编译错误，name是只读的。
fred.name = "paul";
// 这个将正常执行
fred.age = 26;
// 这将得到一个 run-time 错误, 值太大了
fred.age = 200;
