var person = {
	usename : "wade",
	_age : "18",
	get age (){
		return this._age;
	},
	set age(val){
		if(val < 0 || val > 100){
			throw new Error("年龄不合实际");
		}else{
			return this._age;
		}
	}
};
console.log(person.age);

  

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