Question

我在Html档案中附上了javascript。这给我留下了错误,即“肠道圈子是无法界定的,有助于我解决这个问题。

<html>
    <body>
    <h1> Testing Object-based Javascipt </h1>
    <script type="text/javascript">
    function mycircle(x,y,r)
    {
    this.xcoord=x;
    this.ycoord=y;
    this.radius=r;
    this.area = getArea;
    this.getCircumference = function () { return (2 * Math.PI * this.radius ) ; };
    }
   function getArea()
   {
   return (Math.PI * this.radius * this.radius);
   }
        var testCircle = mycircle(3,4,5);

   window.alert( The radius of my circle is   + testCircle.radius);

   </script>

   </body>
   </html>

Thanks in advance....

Answer 1

var testCircle = mycircle(3, 4, 5);

应当:

var testCircle = new mycircle(3, 4, 5);

内容提要请上<代码>新关键词。如不使用关键词,请重新指定<密码>的回报价值。并作为<条码>。页: 1

Answer 2

The error I m getting is radius of undefined. If this is the case. You need to return this at the end of mycircle if you planned to use it without new constructor.

见updated: The fiddle here。

Fix: Broken link

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