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JS学习笔记03-初识继承

2014-06-01 16:23 477 查看

<!DOCTYPE HTML>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>test</title>
<style type="text/css">
</style>
</head>

<body>
<script type="text/javascript">
// ◆prototype方式
var Widget = function(){
title = '';
this.getTitle=function(){
return this.title;
}
this.setTitle=function(){
this.title = arguments[0];
}
}

var Button = function(){}
Button.prototype = new Widget();

var Edit = function(){}
Edit.prototype = new Widget();

var btn = new Button();
btn.setTitle('button title name');

var edt = new Edit();
edt.setTitle('edit title name');

//当前对象中找不到时,查找prototype原型链
console.log(edt.getTitle());
console.log(btn.getTitle());
console.log(btn.title+' '+edt.title);

// ◆call+prototype方式
var Toolbar = function(){
Widget.call(this);
Toolbar.prototype = new Widget();
this.setTitle(arguments[0]);
}

var toolbar = new Toolbar('toolbar title name');
console.log(toolbar.getTitle() +' '+ toolbar.title);

console.log(btn.hasOwnProperty('title'));//true
console.log(btn.hasOwnProperty('setTitle'));//false
console.log(toolbar.hasOwnProperty('title'));//true
console.log(toolbar.hasOwnProperty('setTitle'));//true
</script>
</body>

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