<html>
<head>
<title></title>
<script language="javascript" type="text/javascript">
function print(msg){
document.write(msg);
}
function println(msg){
print(msg + "<br/>");
}
//抽象类形状类
function Shape(edges){
var _edges = edges;
var that = {
getArea : function(){
return -1;
},
getEdges : function(){
return _edges;
}
};
return that;
}
//三角形类
function Triangle(bottom, height)
{
var that = Shape(3);
var _bottom = bottom;
var _height = height;
//重写父类方法
that.getArea = function(){
return 0.5 * _bottom * _height;
};
return that;
}
//四边形类
function Rectangle(bottom, height)
{
var that = Shape(4);
var _bottom = bottom;
var _height = height;
//重写父类方法
that.getArea = function(){
return _bottom * _height;
};
return that;
}
</script>
</head>
<body>
<script language="javascript" type="text/javascript">
var triangle = Triangle(4, 5);
println(triangle.getEdges());
println(triangle.getArea());
println("---------------------");
var rectangle = Rectangle(4, 5);
println(rectangle.getEdges());
println(rectangle.getArea());
</script>
</body>
</html>
