JavaScript 中的单例模式 (singleton in Javascript)

单例模式的基本结构:

MyNamespace.Singleton = function() {
return {};
}();

比如:

MyNamespace.Singleton = (function() {
return { // Public members.
publicAttribute1: true,
publicAttribute2: 10,
publicMethod1: function() {
...
},
publicMethod2: function(args) {
...
}
};
})();

 

但是,上面的Singleton在代码一加载的时候就已经建立了,怎么延迟加载呢?想象C#里怎么实现单例的:)采用下面这种模式:

MyNamespace.Singleton = (function() {
function constructor() { // All of the normal singleton code goes here.
...
}
return {
getInstance: function() {
// Control code goes here.
}
}
})();

具体来说,把创建单例的代码放到constructor里,在首次调用的时候再实例化:

完整的代码如下:

MyNamespace.Singleton = (function() {
var uniqueInstance; // Private attribute that holds the single instance.
function constructor() { // All of the normal singleton code goes here.
...
}
return {
getInstance: function() {
if(!uniqueInstance) { // Instantiate only if the instance doesn't exist.
uniqueInstance = constructor();
}
return uniqueInstance;
}
}
})();
posted @ 2010-06-09 21:24  JadePeng  阅读(467)  评论(0编辑  收藏  举报