JavaScript中创建命名空间

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var sayHello = function() {
  return ‘Hello var‘;
};

function sayHello(name) {
  return ‘Hello function‘;
};

sayHello();

> "Hello var"

function sayHello(name) {
  return ‘Hello function‘;
};

var sayHello = function() {
  return ‘Hello var‘;
};

sayHello();

var NameSpace = window.NameSpace || {};
/*
Function
*/
NameSpace.Hello = function() {
  this.name = ‘world‘;
};
NameSpace.Hello.prototype.sayHello = function(_name) {
  return ‘Hello ‘ + (_name || this.name);
};
var hello = new NameSpace.Hello();
hello.sayHello();

/*
Object
*/
var NameSpace = window.NameSpace || {};
NameSpace.Hello = {
    name: ‘world‘
  , sayHello: function(_name) {
    return ‘Hello ‘ + (_name || this.name);
  }
};

NameSpace.Hello.sayHello(‘JS‘);
> Hello JS;

通过闭包(Closure)和Object实现

var NameSpace = window.NameSpace || {};
NameSpace.Hello = (function() {
  //待返回的公有对象
  var self = {};
  //私有变量或方法
  var name = ‘world‘;
  //公有方法或变量
  self.sayHello = function(_name) {
    return ‘Hello ‘ + (_name || name);
  };
  //返回的公有对象
  return self;
}());

var NameSpace = window.NameSpace || {};
NameSpace.Hello = (function() {
  var name = ‘world‘;
  var sayHello = function(_name) {
    return ‘Hello ‘ + (_name || name);
  };
  return {
    sayHello: sayHello
  };
}());

var NameSpace = window.NameSpace || {};
NameSpace.Hello = new function() {
  var self = this;
  var name = ‘world‘;
  self.sayHello = function(_name) {
    return ‘Hello ‘ + (_name || name);
  };
};

调用

NameSpace.Hello.sayHello();

JavaScript中创建命名空间

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原文地址：http://www.cnblogs.com/Dylanblogs/p/4893894.html