利用闭包私有化变量

利用闭包私有化变量

function Student(name, grade){
	var fakergrade = 100;
	this.name = name;
	this.grade = grade;
	this.cheat = function(){
	this.grade = fakergrade;
	}
	this.sayfakegrade = function(){
	console.log(fakergrade);
	}
}

以上实现了fakergrade私有化