原生js遍历json对象

遍历json对象：

无规律：

<script>

var json = [

{dd:'SB',AA:'东东',re1:123},

{cccc:'dd',lk:'1qw'}

for(var i=0,l=json.length;i<l;i++){

for(var key in json[i]){

alert(key+':'+json[i][key]);

</script>

packJson = [

{"name":"nikita", "password":"1111"},

{"name":"tony", "password":"2222"}

for(var p in packJson){//遍历json数组时，这么写p为索引，0,1

alert(packJson[p].name + " " + packJson[p].password);

也可以用这个：

for(var i = 0; i < packJson.length; i++){

alert(packJson[i].name + " " + packJson[i].password);

遍历json对象

myJson = {"name":"caibaojian", "password":"1111"};

for(var p in myJson){//遍历json对象的每个key/value对,p为key

alert(p + " " + myJson[p]);

有如下 json对象：

var obj ={"name":"冯娟","password":"123456","department":"技术部","sex":"女","old":30};

遍历方法：

for(var p in obj){

str = str+obj[p]+',';

return str;

数组对象的遍历：

<script>

var obj =[

{"name":"冯娟1","password":"123456","department":"技术部","sex":"女","old":30},

{"name":"冯娟2","password":"123456","department":"技术部","sex":"女","old":30},

{"name":"冯娟3","password":"123456","department":"技术部","sex":"女","old":30},

{"name":"冯娟4","password":"123456","department":"技术部","sex":"女","old":30},

{"name":"冯娟5","password":"123456","department":"技术部","sex":"女","old":30}

for(var p in obj){//遍历json对象的每个key/value对,p为key

console.log(obj[p].name);

</script>

下面我们对照一下js和jquer的遍历方法：

<script>

var json = [

{"id":"a","tagNam3e":"apple"},

{"id":"b","tag4Name":"orange"},

{"id":"c","tagName":"banana"},

{"id":"d","tagName":"watermelon"},

{"id":"e","tagName":"pineapple"}

$.each(json, function(i, obj) {

console.log(obj.id)