14-TypeScript简单工厂模式

interface ICompute{
    Compute(a:number,b:number):number;
}

class AddComputer implements ICompute{
    public Compute(a:number,b:number):number{
        return a+b;
    }
}

class SubComputer implements ICompute{
    public Compute(a:number,b:number):number{
        return a-b;
    }
}

class ComputeFactory{
    icompute:ICompute;
    public Compute(a:number,b:number,csign:string):number{
        switch (csign){
            case "+":this.icompute=new AddComputer()
                break;
            case "-":this.icompute=new SubComputer();
        }
        return this.icompute.Compute(a,b);
    }
}

var computefactory=new ComputeFactory();
var result=computefactory.Compute(10,3,"-");
console.log(result);