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Copy path7 - Lazy instantiation.js
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95 lines (75 loc) · 2.01 KB
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/* Singleton with Private Members, step 3. */
/**
* 惰性加载：在大型或复杂的项目中，起到了优化的作用：那些开销较大却很少用到的组件可以被包装到惰性加载单例中，示例程序：
*/
MyNamespace.Singleton = (function() {
// Private members.
var privateAttribute1 = false;
var privateAttribute2 = [1, 2, 3];
function privateMethod1() {
//todo
}
function privateMethod2(args) {
//todo
}
return { // Public members.
publicAttribute1: true,
publicAttribute2: 10,
publicMethod1: function() {
//todo
},
publicMethod2: function(args) {
//todo.
}
};
})();
/* General skeleton for a lazy loading singleton, step 1. */
MyNamespace.Singleton = (function() {
function constructor() { // All of the normal singleton code goes here.
// Private members.
var privateAttribute1 = false;
var privateAttribute2 = [1, 2, 3];
function privateMethod1() {
//todo
}
function privateMethod2(args) {
//todo
}
return { // Public members.
publicAttribute1: true,
publicAttribute2: 10,
publicMethod1: function() {
//todo
},
publicMethod2: function(args) {
//todo
}
}
}
})();
/* General skeleton for a lazy loading singleton, step 2. */
MyNamespace.Singleton = (function() {
function constructor() { // All of the normal singleton code goes here.
//todo
}
return {
getInstance: function() {
// Control code goes here.
}
}
})();
/* General skeleton for a lazy loading singleton, step 3. */
MyNamespace.Singleton = (function() {
var uniqueInstance; // Private attribute that holds the single instance.
function constructor() { // All of the normal singleton code goes here.
//todo
}
return {
getInstance: function() {
if(!uniqueInstance) { // Instantiate only if the instance doesn't exist.
uniqueInstance = constructor();
}
return uniqueInstance;
}
}
})();