<html>
<head>
<script type="text/javascript">
function demoInheritance(){
//会打印出：myProp:Hello Marvin
var str1 = new String("ABC");
for(var tmpName in str1){
alert(tmpName + ":" + str1[tmpName]);
}
//会打印出：myProp:Hello Marvin
var str2 = "XYZ";
for(var tmpName in str2){
alert(tmpName + ":" + str2[tmpName]);
}
//会打印出：myProp:Hello Marvin
var today = new Date();
alert("Today is:" + today);
for(var tmpName in today){
alert(tmpName + ":" + today[tmpName]);
}
//会打印出：myProp:Hello Marvin
var myArray = new Array(10);
alert("myArray is:" + myArray);
for(var tmpName in myArray){
alert(tmpName + ":" + myArray[tmpName]);
}
}
Object.prototype.myProp = "Hello Marvin";
</script>
</head>
<body>
<form>
<input type="button" name="demojavascript" value="Demo Inheritance"
onclick="demoInheritance();"/>
</form>
</body>
</html>