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1. 屬性的刪除
2. 屬性的檢測(cè)
3. 枚舉屬性
4. 序列化對(duì)象

//屬性的設(shè)置和獲取 ./[] （區(qū)別： .是取自身的屬性，[]可以是變量）var obj = {}	obj.name = 'Tina'	obj['age'] = '26'	//打印	console.log(obj.name) //Tina	console.log(obj['name']) //Tina	console.log(obj.age) //26	console.log(obj['age'])//26		// 訪問(wèn)一個(gè)變量	var nameA = 'name'    console.log(obj[nameA]) //相當(dāng)于 console.log(obj['name']), 打印出 Tina

1、屬性的刪除

	// 屬性的刪除	var o= {}	o.name = 'Tina'	o['age'] = '26'		//寫(xiě)法1    delete o.name     console.log(o.name) //underfined        //寫(xiě)法2       delete o['name']    console.log(o['name']) //underfined    

2、屬性的檢測(cè)

	//屬性的檢測(cè)	var o = {}	o.name = 'Tina'	o.age = 'underfined'	//方法1 in運(yùn)算符	console.log('name' in o) // true	//方法2 hasOwnProperty()	console.log(o.hasOwnProperty('name')) //true	//方法3 != underfined  對(duì)值進(jìn)行比較（不推薦使用，比如age）	console.log(o.name != 'underfined') //true	/*	補(bǔ)充	= 賦值	== 匹配判斷	=== 匹配判斷，對(duì)類(lèi)型進(jìn)行判斷*/

3、枚舉屬性（for in多用于對(duì)象，for &each多用于數(shù)組）

// for in//對(duì)象var o = {x:1,y:2,z:3}for(a in o){console.log(a)} // 打印出key: x y zfor(a in o){console.log(o[a])} //打印出value:  1 2 3//數(shù)組var arr = [{x:1},{y:2},{z:3}]for(a in arr){console.log(a)} // 打印出索引: 0 1 2for(a in arr){console.log(arr[a])} //打印出對(duì)象key: value//同步for(var i = 0; i<10; i  ) {	console.log(i) //打印出索引0~9}//異步var data = msg; //假設(shè)已取到后臺(tái)返回的值$.each(data, function(indedx, item) {	alert(data)})alert(data)//如果此alert先出現(xiàn)就改用for})

4、序列化對(duì)象

//序列化對(duì)象var o = {x:1,y:2,z:3}var str = JSON.stringify(o) //轉(zhuǎn)換為字符串{"x":1,"y":2,"z":3}console.log(typeof(str)) //stringvar obj = JSON.parse(str)) //{x: 1, y: 2, z: 3}console.log(typeof(obj)) //object//深拷貝（雙胞胎）淺拷貝（影子）JSON.parse();//深拷貝/*淺拷貝*/var o2 = {x:1,y:2,z:3}var p = o2o2.x = '111'console.log(p) // {x:111,y:2,z:3}/*---------------*/function getFormData() {    var _name = 'Tina'    var _age = '26'    var data = {        "name":_name,        "age":_age    }    return data}//提交$('.btn-submit').on('click',function () {    var data = getFormData()    console.log(JSON.stringify(data)) //{"name":"Tina","age":"26"}    $.ajax({        type: 'POST',        url: url,        cache: false,        data: {dataJson:JSON.stringify(data)}, //傳參        dataType: 'json', //返回值類(lèi)型        success:function(msg){            //        },        error:function(){            //        }    })})