obj.prototype = shuxing；
shuxing[\'属性\']=值；
function Person(){};
var person = new Person();
person.name = \'yy\';
person.gender = \'girl\';
console.log(person.name+\',\'+person.gender);//yy,girl
delete person.name;//删除属性
console.log(person.name);//undefined
// 变式
function Person(){};
var person = new Person();
person[\'name\'] = \'yy\';
person[\'gender\'] = \'girl\';
console.log(person.name+\',\'+person.gender);//yy,girl
delete person.name;//删除属性
console.log(person.name);//undefined