javascript - How to store and update a localStorage key object which has properties of different data types? -

this first time using localstorage , store localstorage key object has properties of different data types ,for example key "localstor" ,it object containing 2 properties :

localstor= { usermsg : string , userinfo : (object) { id: string , username: string , pwd :string } } 

the property usermsg of type string while property userinfo of type object.

i know how set , item containing objects based on this question , in case don't know how set , kind of key? , espacially if want update object userinfo in localstor how that?

any appreciated.

i don't know if understood question, , if did, please tell me can correct answer, think trying manipulate item kept in cache localstorage, , data, instance, object contains data of multiple types.

lets have object localstor (i added tabs it's easier see , debug);

var localstor = {   usermsg : "message",   userinfo :{               id: "someid",               username: "someusername",               pwd : "somepassword"             } } 

putting localstorage super easy (as pointed out know how do) need choose key. here, chose "obj" key:

localstorage.setitem("obj", json.stringify(localstor)); 

as might have noticed, used function json.stringify(). did because since have object objects inside, need convert string store it. javascript has function built-in don't need install anything.

how retrieve , update localstor object now?

very easy. retrieve object localstorage.getitem() function, passing "obj" have setted before, , result need convert object type (since stored string before, remember?) using json.parse() function. after that, can edit properties of object other object:

localstor = json.parse(localstorage.getitem("obj")); localstor.userinfo.username = "anotherusername";  

i can set new object localstorage:

localstorage.setitem("obj", json.stringify(localstor)); 

and that's it! when retrieve again, new value username there.

full code here:

var localstor = {       usermsg : "message",       userinfo :{                   id: "someid",                   username: "someusername",                   pwd : "somepassword"                 }     }      //put localstor object cache     localstorage.setitem("obj", json.stringify(localstor));       //retrieve object     localstor = json.parse(localstorage.getitem("obj"));     //change username property     localstor.userinfo.username = "anotherusername";      //and put editted object cache     localstorage.setitem("obj", json.stringify(localstor));  

if have doubts yet, please tell me can answer in better way!