我无法从Java脚本中的会话存储中加载数组

Question

I am not able to restore a created array in html and reuse it again. I have used Json but do not work with me. in the below code. I'm trying to reload items which is an array created in another page. when i try to load it, it did not work. how can i fix this? does json need header file? Thank you.

$( document ).ready(function() {
    var count=sessionStorage.getItem('items');      
)};

Answer 1

You have to convert your array to a string before setting and back again when your get the item

var letters = ['a', 'b', 'c'];
sessionStorage.setItem("letters", JSON.stringify(letters));
var storedLetters = JSON.parse(sessionStorage.getItem("letters"));

console.log(storedLetters);

Answer 2

The sessionStorage property allows you to access a session Storage object for the current origin.It is two way process first of all stringify object before storing to session and second parse to getting back .

     var user = {'name':'John'};
     sessionStorage['user'] = JSON.stringify(user);
     console.log(sessionStorage['user']);
     var obj = JSON.parse(sessionStorage['user']);
     console.log(Object.keys(obj).length);

Here is fiddle . Opening a page in a new tab or window will cause a new session to be initiated . More About session storage.