base.js --繼承的實現==========================
【注】：繼承後，如果父類是一個類，則會繼承其屬性，方法（包括用prototype聲明的），靜態方法，否則只有屬性和方法。
復制代碼 代碼如下:
Object.prototype.extendf= function (a,b){
if(!a||!b) return;
var fa = typeof a=="function";
var fb = typeof b=="function";
var cha = function(a,b){
for(var c in b){
if(a[c]==undefined)//子類重寫
a[c]=b[c];
}
return a;//返回繼承後的對象
}
if(fa&&fb){
b.apply(this,a.arguments);
cha(a,b);
this["base"] =new b;//通過base訪問父類
return cha(this,b.prototype);
}
else if(!fa&&fb){
cha(a,new b);
a["base"]= new b;
return cha(a,b);
}else if(fa&&!fb){
cha(a,b);
this["base"]=b;
return cha(this,b);
}else if(!fa&&!fb){
a["base"]=b;
return cha(a,b);
}
}
測試頁：用法
復制代碼 代碼如下:
<html>
<head>
<script type="text/javascript" src="base.js"></script>
<script type="text/javascript">
var car2 = {
name:"轎車【父類】",
price:"幾萬【父類】",
start : function(){
alert(this.name+" 已啟動2！【父類】");
},
run : function(){
alert(this.name+" 在行駛當中2。。。【父類】");
},
stop: function(){
alert(this.name+" 已停止2！【父類】");
},
remark: function(){return "【父類】2我是一輛 "+this.name+"；價值 "+this.price;}
// this.remark = "我是一輛 "+this.name+"；價值 "+this.price;
}
//car2.prototype.extra = function(ext){
// return this.name+" 的關稅2是："+ext;
//}
car2.protect = "【父類】2保護的";
car2.noExtra = function(){
return car.protect+" 不交關稅2【父類】";
}
var car = function(name,price){
this.name=name||"轎車 [父類]";
this.price=price||"幾萬[父類]";
this.start = function(){
alert(this.name+" 已啟動！[父類]");
};
this.run = function(){
alert(this.name+" 在行駛當中。。。[父類]");
};
this.stop= function(){
alert(this.name+" 已停止！[父類]");
};
this.remark = function(){return "[父類]我是一輛 "+this.name+"；價值 "+this.price;};
// this.remark = "我是一輛 "+this.name+"；價值 "+this.price; //注意，這樣做 name 和price 將得不到傳參，故注釋
}
car.prototype.extra = function(ext){
return this.name+" 的關稅是[父類]："+ext;
}
car.protect = "[父類]保護的";
car.noExtra = function(){
return car.protect+" 不交關稅[父類]";
}
var BMW = function(){
this.extendf(BMW,car);
this.name = "BMW【子類】";
this.start=function(){
alert(this.name+"專屬 啟動裝置！");
};
return ("this.name1="+this.name);
}
var BMW2 = function(){
this.extendf(BMW2,car2);
this.name = "寶馬終極2號【子類】";
this.start=function(){
alert(this.name+" 專屬 啟動裝置2號未來！");
};
return ("this.name1="+this.name);
}
var bensi = {
name:"bensi",
price:"130萬",
start:function(){
alert(this.name+" 華麗啟動！");
},
stop:function(){
alert(this.name+" 專用剎車停止！");
}
}
bensi.noExtra=function(){
return "誰敢收稅？";
}
var autuo = {
name:"autuo【子類】",
price:"1萬",
stop:function(){
alert(this.name+" 奧拓失靈了！");
}
}
function ChangAn(){
this.extendf(ChangAn,car);
// this.name = "CHANGAN【子類】";
this.run=function(){
alert(this.name+" 走的有點慢。。。");
}
}
var ftest = function(){
var tb = new BMW("寶馬","70萬");
testRun(tb);
alert(BMW.noExtra());
}
var ftest2 = function(){
var tb = bensi//("奔馳","120萬");
tb.extendf(bensi,car);
testRun(bensi);
alert(bensi.noExtra());
}
var ftest3 = function(){
var tb = new ChangAn("長安[傳參]","5萬");
testRun(tb);
alert(ChangAn.noExtra());
}
var ftest4 = function(){
var tb = autuo
tb.extendf(autuo,car2);
testRun(tb);
alert(autuo.noExtra());
}
var ftest5 = function(){
var tb = autuo
tb.extendf(autuo,bensi);
alert(tb.name);
tb.start();
tb.stop();
alert(autuo.noExtra());
}
var ftest6 = function(){
var tb = new BMW2("寶馬2號","65萬");
var scar = document.getElementById("showcar");
scar.innerHTML = tb.remark();
alert(tb.name);
tb.start();
tb.stop();
alert(BMW2.noExtra());
}
//測試輸出
function testRun(tb){
var scar = document.getElementById("showcar");
if(!scar) return false;
scar.innerHTML = tb.remark();
tb.base.start();
tb.start();
tb.base.run();
tb.run();
tb.base.stop();
tb.stop();
alert(tb.extra("1萬"));//父類為Object時這個會出錯，因為父類本身就沒有
}
</script>
</head>
<body>
js測試：
<input type = "button" value = "寶馬" onclick = "ftest()" >
<input type = "button" value = "奔馳" onclick = "ftest2()" >
<input type = "button" value = "長安" onclick = "ftest3()" >
<input type = "button" value = "奧拓" onclick = "ftest4()" >
<input type = "button" value = "奔馳類的奧拓" onclick = "ftest5()" >
<input type = "button" value = "寶馬2號" onclick = "ftest6()" >
<div id = "showcar"></div>
</body>
</html>
ps：沒有注意到性能問題，往大家改善
想只用一個參數，不知道大家有沒有辦法？
嵌套類 沒試過。