?? zinheritexample3.htm
字號:
<html>
<head>
<title>Example</title>
<script type="text/javascript" src="zinherit.js"></script>
</head>
<body>
<script type="text/javascript">
function ClassX() {
this.messageX = "This is the X message.";
if (typeof ClassX._initialized == "undefined") {
ClassX.prototype.sayMessageX = function () {
alert(this.messageX);
};
ClassX._initialized = true;
}
}
function ClassY() {
this.messageY = "This is the Y message.";
if (typeof ClassY._initialized == "undefined") {
ClassY.prototype.sayMessageY = function () {
alert(this.messageY);
};
ClassY._initialized = true;
}
}
function ClassZ() {
ClassX.apply(this);
ClassY.apply(this);
this.messageZ = "This is the Z message.";
if (typeof ClassZ._initialized == "undefined") {
ClassZ.prototype.inheritFrom(ClassX);
ClassZ.prototype.inheritFrom(ClassY);
ClassZ.prototype.sayMessageZ = function () {
alert(this.messageZ);
};
ClassZ._initialized = true;
}
}
var objZ = new ClassZ();
objZ.sayMessageX();
objZ.sayMessageY();
objZ.sayMessageZ();
</script>
</body>
</html>
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