javascript的继承

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<HTML>

<HEAD>

<TITLE> New Document </TITLE>

<!--

//创建连接一个字符串父类

function StringBuffer()

{

//私有属性 _strings

this._strings= new Array;

}

//以下为StringBuffer类2个方法

StringBuffer.prototype.append = function (str)

{

this._strings.push(str);

}

StringBuffer.prototype.toString = function(){

return this._strings.join('');

}

//子类

function StringBufferA()

{

}

//继承父类所有属性与方法

StringBufferA.prototype = new StringBuffer();

//复写父类方法toString

StringBufferA.prototype.toString = function(type){

return this._strings.join(type);

}

//测试代码

function test()

{

//基类

var buffer = new StringBuffer();

buffer.append("Hello");

buffer.append("World");

var result = buffer.toString();

alert(result);

//继承类

var bufferA = new StringBufferA();

bufferA.append("Hello");

bufferA.append("World");

var resultA = bufferA.toString('--------');

alert(resultA);

}

window.onload=test;

//-->

</SCRIPT>

</HEAD>

<BODY>

</BODY>

</HTML>

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javascript的 继承

javascript的继承