JavaScript 中的单例模式 （singleton in Javascript)

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

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

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

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;
}
}
})();