JavaScript面向对象测试

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JavaScript面向对象测试</title>
<mce:script language="javascript"></mce:script>
</head>

<body>
</body>
</html>

===========================================

打印输出：

6
undefined
NaN
3
=====================================
pic1:
[object Object]
pic1.toStr:
function toStr(){ return "width: " + this.width + "
" + "height: " + this.height + "
" + "color: " + this.color + "
" + "shape: " + this.shape + "
" + "area: " + this.area + "
"; }
pic1.toStr():
width: 20
height: 15
color: red
shape: 三角形
area: 100平方米

删除前的area
area:100平方米
=====================================
删除后的area
area:256平方米
=====================================
true
false
=====================================
number
string
boolean
object
function
undefined