JavaScript,对象,属性,检查,增加,删除,访问,操作检查属性
var mouse = { "name": "betta", "age": 3, "varieties": "milaoshu"} mouse.hasOwnProperty("name"); // truemouse.hasOwnProperty("sex"); //false增加属性 定义个对象 dog，然后赋予各种特性，再赋予 color特性，最后遍历所有的属性以及值
var dog={ name:"芒果", type:"会之王", eat:function(){ alert("吃"); }} Object.prototype.color="白色"; var name; for(name in dog){ document.write(name+" "+dog[name]+"<br>") }效果如下
name 芒果type 会之王eat function (){ alert("吃"); }color 白色删除属性
var cat = { "name": "tom", "sex": "man", "color": "yellow"}delete cat.name;cat.sex = undefined;cat.color = null;alert("name属性是否存在：" + cat.hasOwnProperty("name")); //falsealert("sex属性是否存在：" + cat.hasOwnProperty("sex")); //truealert("color属性是否存在：" + cat.hasOwnProperty("color")); //true访问属性
var cat = { "name": "tom", "sex": "man", "color": "yellow"}var name1 = cat.name; //通过点操作符来访问对象属性var name2 = cat["name"]; //通过中括号操作符来访问对象属性还有创建对象的两种方式
var obj = new Object();obj.name = "MangGuo";obj.age = 25;var obj = { name : "MangGuo", //name是属性名，"MangGuo"是值 age : 25}
JavaScript,对象,属性,检查,增加,删除,访问,操作
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