如何在构造函数中使用公共公用函数访问私有变量

Question

How to access a private variables using a common public function within the constructor.

function construct(){

    var priValue1 = 0;
    var priValue2 = 0;
    var priValue3 = 0;    

    this.getvalue = function(_input){
        return this[_input];
    }

}

construct.prototype.init = function(){
    if(this.getvalue("priValue1")){
        console.log("Value 1")
    }
}

var nc = new construct();
nc.init();

Couldn't get access for the private variable.

Answer 1

You could store your private variables in an object, and access them by property name.

 function construct(){ var priVars = { priValue1: 0, priValue2: 0, priValue3: 0 }; this.getvalue = function(_input){ return priVars[_input]; } } construct.prototype.init = function(){ if(this.getvalue("priValue1")){ console.log("Value 1") } } var nc = new construct(); nc.init(); 

Answer 2

When you declare a "private var" this is not stored on this , the variable is accesible as a scope variable. Using your own code I would write

this.getvalue = function(_input){
    return eval(_input);
}

to get the value dynamically