- 用一个类来创建其他类实例
function ShapeFactory(name)
{
var shape;
switch(name)
{
case 'rect':
shape = new Shape()
break
case 'circle':
shape = new Circle()
break
case 'line':
shape = new Line()
break
case 'arrow':
shape = new Arrow()
break
}
return shape;
}
/**
* 应用
*/
var rect = new ShapeFactory('rect');
工厂
