# storage

storage is a series of apis, support add, modify and delete stored data.

# API

# setItem

When passed a key and a value, it will saved into the storage, or update the value if the key already exists.

# setItem(key, value, callback)

• @key, string, the name of the key you want to store. "" or null is not allowed.
• @value, string, the name of the value you want to store."" or null is not allowed.
• @callback, function, the callback function after executing this action.

# getItem

When passed a key, will return that key's value.

# getItem(key, callback)

• @key, string, the name of the key you want to retrieve the value of."" or null is not allowed.
• @callback, function, the callback function after executing this action.

# removeItem

When passed a key, will remove that key and value from the storage.

# removeItem(key, callback)

• @key, string, the name of the key you want to remove."" or null is not allowed.
• @callback, function, the callback function after executing this action.

var storage = weex.requireModule('storage');
storage.removeItem('foo', function(e) {
  // callback. 'e' is an object that contains 'result' and 'data'.
  // e.result will return 'success' or 'failed' according to the executing result.
  // e.data will always return 'undefined' in this function if success.
});

# length

Returns an integer representing the number of key-value items stored in the storage.

# length(callback)

• @callback, the callback function after executing this action.

# getAllKeys

Returns an array that contains all keys stored in the storage.

# getAllKeys(callback)

• @callback, the callback function after executing this action.

Demo