关于firebug的一些讲解

<script type="text/javascript">

function Shape(number)

{

this.number = number;

}

Shape.prototype.getArea = function()

{

return -1;

}

//这是三边形的面积计算

/*function Triangle(width,height)

{

//Shape.call(this,3);

this.width = width;

this.height = height;

}

Triangle.prototype.getArea = function()//相当于java中的重写方法

{

return 0.5 * this.width * this.height;

}

Triangle.prototype.getNumber = function()

{

return this.number;

}

var triangle = new Triangle(12,12);*/

//document.write("该"+triangle.getNumber()+"边形的面积是："+triangle.getArea());

//这是四边形的面积计算

function Rentage(width, height)

{

Shape.call(this,4);

this.width = width;

this.height = height;

}

Rentage.prototype = new Shape();

Rentage.prototype.getArea = function()//函数重写

{

return this.width * this.height;

}

Rentage.prototype.getNumber = function()

{

return this.number;

}

var rentage = new Rentage(3,4);

//alert("asd");

//alert(rentage.getNumber());

//alert(rentage.getArea());

document.write("该" +　rentage.getNumber() + "形的面积是：" + rentage.getArea());

//关于firebug的控制台的一些调试方法

function showMessage(message)

{

console.log(message);

console.info(message);

console.error(message);

console.warn(message);

console.debug(message);

}

function test(name)

{

showMessage(name);

}

test("姓名");

document.wrute("asds");

</script>