JavaScript 繼承方式（4）
4，繼承工具函數四
/**
* @param {String} className
* @param {String/Function} superClass
* @param {Function} classImp
*/
function $class(className, superClass, classImp){
if(superClass === "") superClass = Object;
var clazz = function(){
return function(){
if(typeof this.init == "function"){
this.init.apply(this, arguments);
}
};
}();
var p = clazz.prototype = new superClass();
var _super = superClass.prototype;
window[className] = clazz;
classImp.apply(p, [_super]);
}
* @param {String} className
* @param {String/Function} superClass
* @param {Function} classImp
*/
function $class(className, superClass, classImp){
if(superClass === "") superClass = Object;
var clazz = function(){
return function(){
if(typeof this.init == "function"){
this.init.apply(this, arguments);
}
};
}();
var p = clazz.prototype = new superClass();
var _super = superClass.prototype;
window[className] = clazz;
classImp.apply(p, [_super]);
}
定義父類Person
/**
* 父類 Person
*/
$class('Person','',function(){
this.init = function(name){
this.name = name;
};
this.getName = function(){
return this.name;
};
this.setName = function(name){
this.name = name;
}
});
* 父類 Person
*/
$class('Person','',function(){
this.init = function(name){
this.name = name;
};
this.getName = function(){
return this.name;
};
this.setName = function(name){
this.name = name;
}
});
子類Man
/**
* 子類 Man
*/
$class('Man', Person, function(supr){
this.init = function(name, age){
supr.init.apply(this,[name]); // 該句很重要
this.age = age;
};
this.getAge = function(){
return this.age;
};
this.setAge = function(age){
this.age = age;
};
});
var m = new Man('Jack',25);
console.log(m.name); // Jack
console.log(m.age); // 25
* 子類 Man
*/
$class('Man', Person, function(supr){
this.init = function(name, age){
supr.init.apply(this,[name]); // 該句很重要
this.age = age;
};
this.getAge = function(){
return this.age;
};
this.setAge = function(age){
this.age = age;
};
});
var m = new Man('Jack',25);
console.log(m.name); // Jack
console.log(m.age); // 25
從輸出看可以看到子類Man的確繼承了父類的屬性和方法。
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