java-script对象减速结构在维护，性能和内存方面都很好？
我的对象结构类似于下面的形式，我可以用3种方式编写：
1.在所有地方使用完全限定名称。
context.flow.myobject = {}; context.flow.myobject.SomeValue = 11; context.flow.myobject.IsNumber = function(){ //Check if it is a number. }; context.flow.myobject.Calculate = function(value){ if(context.flow.myobject.IsNumber()){ // Preform calculations. // Will use this variable at multiple place in // this function as **context.flow.myobject.SomeValue** } };
2.使用内联和此关键字：
context.flow.myobject = { SomeValue: 11, IsNumber: function(){ //Check if it is a number. }, Calculate: function(value){ if(this.IsNumber()){ // Preform calculations. // Will use this variable at multiple place in // this function **this.SomeValue** } } };
3.使用引用的对象：
context.flow.myobject = {}; context.flow.myobject.SomeValue = 11; var myobject = context.flow.myobject; myobject.IsNumber = function(){ //Check if it is a number. }; myobject.Calculate = function(value){ if(context.page.main.MY_VAR.IsNumber()){ // Preform calculations. // Will use this variable at multiple place in // this function **myobject.SomeValue** } };
4.或者我可以使用类似于第二种方法的构造函数：
context.flow.myobject = function(){ this.SomeValue = 11; this.IsNumber: function() { //Check if it is a number. }; this.Calculate: function(value) { if(this.IsNumber()) { // Preform calculations. // Will use this variable at multiple place in // this function **this.SomeValue** } } };
Stack Overflow用户
发布于 2018-08-17 14:52:21
可以通过将something.far.away作为快捷方式（本地化）来增加性能：
function foo(){ var farAway = something.far.away; // do many things with farAway; }
是将far.away.things本地化。例如：
something.far.away = 42; function foo(x, y){ var far = something.far.away; // localize var ret = 0; for(var i=0; i< 1000000; i++){ ret += far + x - far / y; } return ret; }
如果只使用一次，则性能不会提高：
function nope(x, y){ // NO performance increase, this is actually less performant // because we have to store a new var, then go retrieve it! var far = something.far.away; return far + x + y; }
可以本地化功能，所以在你的例子中，可能将＃3清理为：
// objects are "by reference", see link after code block. context.flow.myobject = {}; var obj = context.flow.myobject; // localize obj.SomeValue = 11; obj.IsNumber = function(value) { //Check if it is a number. } obj.Calculate = function(value) { if(obj.IsNumber(value)) { var val = obj.SomeValue; // localize // Preform calculations. // Will use this variable at multiple place in // this function **myobject.SomeValue** } }
https://stackoverflow.com/questions/-100002233
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