js traverses key and value instances of json

Native js traverses json objects

Traversing the json object:

Irregular:

<script>
var json = [{dd:'SB',AA:' Dongdong ',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>

Regular:

packJson = [
{"name":"nikita", "password":"1111"},
{"name":"tony", "password":"2222"}
];

for(var p in packJson){// Traversal json Array, write p For the index, 0,1
 alert(packJson[p].name + " " + packJson[p].password);
}

You can also use this:

for(var i = 0; i < packJson.length; i++){
 alert(packJson[i].name + " " + packJson[i].password);
}

Traversing the json object

myJson = {"name":"caibaojian", "password":"1111"};
for(var p in myJson){// Traversal json Object for each of the key/value Right ,p For key
 alert(p + " " + myJson[p]);
}

There are the following json objects:

var obj = {"name": "Feng Juan", "password": "123456", "department": "Technology Department", "sex": "Female", "old": 30};

Traversal method:

for(var p in obj){
str = str+obj[p]+',';
return str;
}