删除主要是delet方法；
1 ????????????function Person(){}; 2 ????????????var person = new Person(); 3 ????????????person.name = ‘yy‘; 4 ????????????person.gender = ‘girl‘;4df 5 ????????????console.log(person.name+‘,‘+person.gender);//yy,girl 6 ????????????delete person.name;//删除属性 7 ????????????console.log(person.name);//undefined 8 // ???????????变式 9 ????????????function Person(){};10 ????????????var person = new Person();11 ????????????person[‘name‘] = ‘yy‘;12 ????????????person[‘gender‘] = ‘girl‘;13 ????????????console.log(person.name+‘,‘+person.gender);//yy,girl14 ????????????delete person.name;//删除属性15 ????????????console.log(person.name);//undefined ???????????????????构造函数中this
var Person = function (){ ???????????????this.name = ‘yy‘; ???????????????this.gender = ‘girl‘ ???????????}; ???????????var person = new Person(); ???????????console.log(person.name+‘,‘+person.gender);//yy,girl原型中添加属性
var Person = function (){ ???????????????}; ???????????Person.prototype.name = ‘yy‘; ???????????Person.prototype.gender = ‘girl‘; ???????????var person = new Person(); ???????????console.log(person.name+‘,‘+person.gender);//yy,girl ???????????console.log(person[‘name‘]+‘,‘+person[‘gender‘]);//yy,girl字面量添加属性
var person = { ???????????????}; ???????????person.name = ‘yy‘; ???????????person.gender = ‘girl‘; ???????????console.log(person.name+‘,‘+person.gender);//yy,girl ???????????console.log(person[‘name‘]+‘,‘+person[‘gender‘]);//yy,girl// ???????????另一种写法 ???????????var person = { ???????????????name: ‘yy‘, ???????????????gender: ‘girl‘ ???????????}; ???????????console.log(person.name+‘,‘+person.gender);//yy,girl ???????????console.log(person[‘name‘]+‘,‘+person[‘gender‘]);//yy,girl封装extend方法
var p1 = {}; ???????????var p2 = {name:‘yy‘,gender:‘girl‘}; ???????????p1.extend = function(obj){ ???????????????for(var k in obj){ ???????????????????this[k] = obj[k]; ???????????????} ???????????} ???????????p1.extend(p2); ???????????console.log(p1.name+‘,‘+p1.gender);//yy,girl ???????????console.log(p1[‘name‘]+‘,‘+p1[‘gender‘]);//yy,girl关于js对象中的，属性的增删改查问题
原文地址：http://www.cnblogs.com/chengxuxing/p/7732498.html