I tried this one
JSON.stringify(localStorage, function(key, value) {
console.log(key);
return (key.split('.')[0] === 'SUWDdb') ? value : undefined;
})
and it only returns undefined, console only log one entries. can any one give me a reason and a solution?
Well, nothing at the top level satisfies your condition, and in that case your function is returning undefined, which means nothing below that is stringified. You probably want:
JSON.stringify(localStorage, function(key, value) {
console.log(key);
return (typeof value === 'object' || key.split('.')[0] === 'SUWDdb') ? value : undefined;
^^^^^^^^^^^^^^^^^^^^^^^^^
})
This will allow JSON.stringify to keep traversing downward when it encounters an object.
Just keep it simple if you have localstorage and you want to stringify it use
JSON.stringify(localstorage) Where localstorage is variable that has localstorage object
jsonString = JSON.stringify(value [, replacer [, space]])
value The JavaScript object to convert into a JSON string.
replacer A function that alters the behavior of the stringification process, or an array of String and Number objects that serve as a whitelist for selecting the properties of the value object to be included in the JSON string. If this value is null or not provided, all properties of the object are included in the resulting JSON string.
This is the syntax of json.stringify function,its not a callback function
