在变量中存储并设置所有本地存储

Question

I need to save all domain localStorage in variable and later set it again from variable.

I trying save localstorage with this code:

for (var i = 0, len = localStorage.length; i < len; ++i) {
 objects = JSON.stringify(localStorage.getItem(localStorage.key(i)));
}
console.log(objects);

But it gives me a error. And how can i set all localstorage from variable? Something like this?

for (var i = 0, len = objects.length; i < len; i++) {
      localStorage.setItem(len, objects(i);
}

Answer 1

You could do something like this to set the items:

function setItem(key, value){
    if (typeof value === 'object') {
        value = JSON.stringify(value);
    }
    localStorage.setItem(key, value);
}

and something like this to retrieve it:

function getItem(key){
    if (key){
        try{
            return JSON.parse(localStorage.getItem(key));
        }
        catch(e){
            return localStorage.getItem(key);
        }
    }
}

localStorage only save strings, numbers or booleans so if your value is an object you need to stringify it before save it, then when you retrieve it you need to parse it again to an object.

Now take this 2 functions and use them like wrappers to access the localStorage values in your loops.

[Update - Fixing Loops]

Get Data

var objects = {};
for (var i = 0, len = localStorage.length; i < len; i++) {
  objects[localStorage.key(i)] = getItem(localStorage.key(i));
}
console.log(objects);

Set Data

for (var o in objects) {
   setItem(o, objects[o]);
}