使用JScript.NET創(chuàng)建asp.net頁面（四）
2024-07-10 12:58:09
供稿：網(wǎng)友
在jscript中定義類通過類聲明, 包含方法和對象和var 聲明。對于類的派生通過下面兩個程序的對比，你講清楚地明白。
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還支持定義private和protected property通過get和set進(jìn)行讀寫。
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 只讀
function get name() : string
{
return this.m_sname;
}
// age 讀寫但是只能用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);
// 這將產(chǎn)生一個編譯錯誤，name是只讀的。
fred.name = "paul";
// 這個將正常執(zhí)行
fred.age = 26;
// 這將得到一個 run-time 錯誤, 值太大了
fred.age = 200;
