Detailed explanation of implementation examples of javascript private members

Many books say that Javascript cannot truly implement Javascript private members, so during development, it is agreed that __ starting with two underscores is a private variable.

Later, I discovered the feature of closures in Javascript, which completely solved the problem of Javascript private members.

function testFn(){
    var _Name;//定义Javascript私有成员
    this.setName = function(name){
     _Name = name; //从当前执行环境中获取_Name
    }
    this.getName = function(){
     return _Name;
    }
}// End testFn
var test = testFn();
alert(typeof test._Name === "undefined")//true
test.setName("KenChen");

test._Name cannot be accessed at all, but it can be accessed using object methods because closures can obtain information from the current execution environment.

Next let’s take a look at how shared members are implemented

function testFn(name){
  this.Name = name;
  this.getName = function(){
   return this.Name;
  }
}
var test = new testFn("KenChen");
test.getName(); //KenChen
test.Name = "CC";
est.getName();//CC

Next let’s take a look at how class static variables are implemented

function testFn(){
}
testFn.Name = "KenChen";
alert(testFn.Name);//KenChen
testFn.Name = "CC";
alert(testFn.Name);//CC

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