我们怎么去模拟重载，在javasceipr中我们可以通过参数的类型区别或者数量的区别，来去让同样一个函数名字，可以根据不同的参数列表的情况来去调用相应的函数。
javascript中函数类型是不确定的，并且参数的个数也是可以任意的，那么我们可以通过判断实际传入的参数的个数，来去做一个模拟的重载，
OOP(模拟重载、链式调用、模块化)
模拟重载
function person() {
var args = arguments;
if (typeof args[0] === 'object' && args[0]) {
if (args[0].name) {
this.name = args[0].name;
}
if (args[0].age) {
this.age = args[0].age;
}
} else {
if (args[0]) {
this.name = args[0];
}
if (args[1]) {
this.age = args[1];
}
}
};
person.prototype.toString = function() {
return "姓名:" + this.name + "年龄:" + this.age
}
var peng = new person({
name: "继小鹏",
age: 23
});
console.log(peng.toString()); //姓名:继小鹏年龄:23
var peng1 = new person("是你", 23);
console.log(peng1.toString()); //姓名:是你年龄:23
调用子类方法
例子1
if (!Object.create) {
Object.create = function(proto) {
function F() {};
F.prototype = proto;
return new F();
};
}
function person(name) {//基类
this.name=name;
}
person.prototype.init=function(){
console.log("你好"+this.name)
}
function student(name,classname){ //学生类
this.classname=classname;
person.call(this,name);
}
student.prototype = Object.create(person.prototype);
student.prototype.constructor = student;
student.prototype.init=function(){
console.log("你好s"+this.name)
}
var peng=new student("继小鹏","class2");
console.log(peng);
peng.init();
例子2子类调用基类方法
function person(name) {//基类
this.name=name;
}
function student(name,classname){ //学生类
this.classname=classname;
person.call(this,name);
}
person.prototype.init=function(){
console.log(this.name)
}
student.prototype.init=function(){
person.prototype.init.apply(this,arguments);
}
var peng=new student("继小鹏","class2");
console.log(peng);
peng.init();
链式调用
function classman() {}
classman.prototype.addClass = function(str) {
console.log('calss' + str + 'added');
return this;
}
var mang = new classman();
mang.addClass('classA').addClass('classB').addClass('classC')
// calssclassAadded
// calssclassBadded
// calssclassCadded
使用jq的时候$("#id").addClass('df')
选择器做些操作后在继续addClass('df')还可以再做动作一层层链式去调用。
例子解释
function classman() {} //现定义一个构造器classman
classman.prototype.addClass = function(str) { //给classman构造器prototype添加addClass属性方法
console.log('calss' + str + 'added'); //输出表示添加一个class
return this; //return this表示返回classman的实例因为返回了实例那么紧接着后面不需要加mang.addClass('classA')直接后面加.addClass('classB').addClass('classB')就可以，每次执行完都会返回实例
}
var mang = new classman();
mang.addClass('classA').addClass('classB').addClass('classC')
// calssclassAadded
// calssclassBadded
// calssclassCadded
抽象类
function Detectorlse() {
throw new Error("Abstract class can not be invoked directly!");
}
Detectorlse.detect = function() {
console.log('Detcetion starting...');
}
Detectorlse.stop = function() {
console.log('Detector stopped');
}
Detectorlse.init = function() {
throw new Error("Error");
}
function linkDetector() {};
linkDetector.prototype = Object.create(Detectorlse.prototype)
linkDetector.prototype.constructor = linkDetector;
//...add methods to LinkDetector...
defineProperty(ES5)
function Person(name) {
Object.defineProperty(this, 'name', {
value: name,
enumerable: true
});
};
Object.defineProperty(Person, 'arms_num', {
value: 2,
enumerable: true
});
Object.seal(Person.prototype);
Object.seal(Person);
function student(name, classname) {
this.classname = classname;
Person.call(this, name);
};
student.prototype = Object.create(Person.prototype);
student.prototype.constructor = student;
var peng = new Person('继小鹏');
console.log(peng);
var han = new student("汗", "class2");
console.log(han);
模块化
定义简单模块化
var moduleA;
moduleA=function(){
var prop=1;
function func(){};
return {
func:func,
prop:prop
}
}();
定义简单模块化2
var moduleA;
moduleA = new function() {
var prop = 1;
function func() {};
this.func = func;
this.prop = prop;
}();
