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貌似老师的代码错了，有哪位大神纠正下

!function(global){
	function DetectorBase(configs){
if (!this instanceof DetectorBase) {
	throw new Error('Do not invoke without new.')
   }
   this.configs=configs;
   this.analyze();  
	}
}(this);
DetectorBase.prototype.detect = function() {
	throw new Error('Not implemented')
};
DetectorBase.prototype.analyze=function(){
	console.log('Analyzing...')
	this.data="##data##"
};
function LinkDetector(links){
	if (!this instanceof LinkDetector) {
		throw new Error('Do not invoke without new.')
	}
	this.links=links;
	DetectorBase.apply(this,arguments);
}
function ContainerDetector(containers){
	if (!this instanceof ContainerDetector) {
		throw new Error('Do not invoke without new.')
	}
	this.containers=containers;
	DetectorBase.apply(this,arguments);
}
function inherit(subClass,superClass){
subClass.prototype=Object.create(superClass.prototype)
subClass.prototype.constructor=subClass;
}
inherit(LinkDetector,DetectorBase);
inherit(ContainerDetector,DetectorBase);
LinkDetector.prototype.detect=function(){
	console.log('Loading data:'+this.data);
	console.log('link detection started.');
	console.log('Scaning link:'+this.links);
};
ContainerDetector.prototype.detect=function(){
	console.log('Loading data:'+this.data);
	console.log('Container detection started.');
	console.log('Scaning containers:'+this.containers);
}
Object.defineProperties(global,{
LinkDetector:{value:LinkDetector},
ContainerDetector:{value:ContainerDetector},
DetectorBase:{value:DetectorBase}
});
var a=new ContainerDetector('#abc');
var b=new LinkDetector('http://www.baidu.com')
a.detect;
b.detect;

VM25187:11 Uncaught ReferenceError: DetectorBase is not defined

miragele

2016-04-25

源自：JavaScript深入浅出 9-2

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3 回答

AllenW 回答被采纳 +3 积分
2016-04-27

/**
 * Created by wz on 16/4/27.
 */
 
 //这样应该可以了
var Detec=(function(global){
    return{
        cons:function DetectorBase(configs){
            if (!this instanceof DetectorBase) {
                throw new Error('Do not invoke without new.')
            }
            this.configs=configs;
            this.analyze();
        }
    }
})(this);
Detec.cons.prototype.analyze=function(){
    console.log('Analyzing...');
    this.data="##data##";
};
Detec.cons.prototype.detect=function () {
    throw new Error('Not implemented');
};
function LinkDetector(links){
    if (!this instanceof LinkDetector) {
        throw new Error('Do not invoke without new.')
    }
    this.links=links;
    Detec.cons.apply(this,arguments);
}
function ContainerDetector(containers){
    if (!this instanceof ContainerDetector) {
        throw new Error('Do not invoke without new.')
    }
    this.containers=containers;
    Detec.cons.apply(this,arguments);
}
function inherit(subClass,superClass){
    subClass.prototype=Object.create(superClass.prototype);
    subClass.prototype.cons=subClass;
}
inherit(LinkDetector,Detec.cons);
inherit(ContainerDetector,Detec.cons);
LinkDetector.prototype.detect=function(){
    //console.log(this);
    //alert(this instanceof LinkDetector);
    console.log('Loading data:'+this.data);
    console.log('link detection started.');
    console.log('Scaning link:'+this.links);
};
ContainerDetector.prototype.detect=function(){
    console.log('Loading data:'+this.data);
    console.log('Container detection started.');
    console.log('Scaning containers:'+this.containers);
};
Object.defineProperties(this,{
    LinkDetector:{value:LinkDetector},
    ContainerDetector:{value:ContainerDetector},
    DetectorBase:{value:Detec.cons}
});
var a=new ContainerDetector('#abc');
var b=new LinkDetector('http://www.baidu.com');

a.detect();
b.detect();

0 回复有任何疑惑可以回复我~

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miragele 提问者

非常感谢！

2016-04-29 回复有任何疑惑可以回复我~

qq_包包世界我专业_0
2016-09-11

我这个也可以的，不用怎么改老师的代码

!function(global){

function DetectorBase(configs){

if (!this instanceof DetectorBase) {

throw new Error('Do not invoke without new.')

}

this.configs=configs;

this.analyze();

}

window["DetectorBase"]=DetectorBase;

}(this);

DetectorBase.prototype.detect = function() {

throw new Error('Not implemented')

};

DetectorBase.prototype.analyze=function(){

console.log('Analyzing...')

this.data="##data##"

};

function LinkDetector(links){

if (!this instanceof LinkDetector) {

throw new Error('Do not invoke without new.')

}

this.links=links;

DetectorBase.apply(this,arguments);

}

function ContainerDetector(containers){

if (!this instanceof ContainerDetector) {

throw new Error('Do not invoke without new.')

}

this.containers=containers;

DetectorBase.apply(this,arguments);

}

function inherit(subClass,superClass){

subClass.prototype=Object.create(superClass.prototype)

subClass.prototype.constructor=subClass;

}

inherit(LinkDetector,DetectorBase);

inherit(ContainerDetector,DetectorBase);

LinkDetector.prototype.detect=function(){

console.log('Loading data:'+this.data);

console.log('link detection started.');

console.log('Scaning link:'+this.links);

};

ContainerDetector.prototype.detect=function(){

console.log('Loading data:'+this.data);

console.log('Container detection started.');

console.log('Scaning containers:'+this.containers);

}

Object.defineProperties(this,{

LinkDetector:{value:LinkDetector},

ContainerDetector:{value:ContainerDetector},

DetectorBase:{value:DetectorBase}

});

var a=new ContainerDetector('#abc');

var b=new LinkDetector('http://www.baidu.com')

a.detect();

b.detect();

1 回复有任何疑惑可以回复我~

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qq_Say_3

为什么要在最后加个（this）才行呢？ !function(global){ …… }(this);

2017-03-19 回复有任何疑惑可以回复我~

一_叶_知_秋
2016-08-06

你代码里匿名函数的花括号结束地点错啦，应该在这之后才对，要把所有的函数声明都包含在函数体内，这样才能调用定义的DetectorBase，否则会说DetectorBase是undefined的

下面这样就可以运行了

!function(global){ //用函数包裹以防止基类的变量和函数在外部被更改

function DetectorBase(config)

{

if(!this instanceof DetectorBase){

throw new Error("Do't invoke without new.");

}

this.config = config;

this.analyze();

}

DetectorBase.prototype.detect = function(){

throw new Error("not implemented");

}

DetectorBase.prototype.analyze = function(){

console.log("analyzing...");

this.data = "###data###";

}

function LinkDetector(links){

if(!this instanceof LinkDetector){

throw new Error ("Don't invoke without new.");

}

this.links=links;

DetectorBase.call(this,arguments[1]);

}

function ContainerDetector(containers){

if(!this instanceof ContainerDetector){

throw new Error ("Don't invoke without new.");

}

this.containers=containers;

DetectorBase.call(this,arguments[1]);

}

//inherit obj

inherit(LinkDetector,DetectorBase);

inherit(ContainerDetector,DetectorBase);

function inherit(subClass,superClass){

subClass.prototype = Object.create(superClass.prototype);

subClass.prototype.constructor = subClass;

}

//expand child class

LinkDetector.prototype.detect = function(){

console.log("Loading data:"+this.data);

console.log("Link detection started.");

console.log("Scaning links:"+this.links);

}

ContainerDetector.prototype.detect = function(){

console.log("Loading data:"+this.data);

console.log("container detection started.");

console.log("Scaning containers:"+this.containers);

}

//prevent from being altered

Object.freeze(DetectorBase);

Object.freeze(DetectorBase.prototype);

Object.freeze(LinkDetector);

Object.freeze(LinkDetector.prototype);

Object.freeze(ContainerDetector);

Object.freeze(ContainerDetector.prototype);

//export to global object 可以将这些类添加到global对象（对浏览器来说为window对象）同时防止其被更改

Object.defineProperties(global,{

LinkDetector:{value:LinkDetector},

ContainerDetector:{value:ContainerDetector},

DetectorBase:{value:ContainerDetector}

});

}(this);

var cd = new ContainerDetector("#abc","#def","#ghi");

var ld = new LinkDetector("http://www.taobao.com");

cd.detect();

ld.detect();

2 回复有任何疑惑可以回复我~

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