add insert_guarantee option

src/core/proxy.coffee

@@ -12,6 +12,7 @@ define (require, exports, module) ->
             @encrypt = options.encrypt
             @name = options.name
             @proxy = options.proxy
+            @insert_guarantee = options.insert_guarantee
             @evemit = new Evemit()
             @iframe = Utils.createIframe @proxy
             Evemit.bind window, "message", (e) ->
@@ -29,6 +30,7 @@ define (require, exports, module) ->
             data.expire = @expire
             data.encrypt = @encrypt
             data.name = @name
+            data.insert_guarantee = @insert_guarantee
             @evemit.once eve, callback
             data = JSON.stringify data
             ifrWin = @iframe.contentWindow

src/core/storage.coffee

@@ -11,6 +11,7 @@ define (require, exports, module) ->
             @expire = options.expire
             @encrypt = options.encrypt
             @token = options.name
+            @insert_guarantee = options.insert_guarantee
             if @expire is "window"
                 throw new Error("sessionStorage is not supported!") if not Support.sessionstorage()
                 @storage = sessionStorage
@@ -42,9 +43,11 @@ define (require, exports, module) ->
                 @storage.setItem(key, val)
             catch e
                 ### TODO
-                 *  需要在LocalDB的构造函数中增加配置参数，来确定是否自动删除最老数据
                  *  增加过期时间配置项
                 ###
+                if not @insert_guarantee
+                    callback(e)
+                    return
                 val = Encrypt.decode(val, @token) if @encrypt
                 data = Utils.parse val
                 while cnt > 10

src/localdb.coffee

@@ -35,11 +35,13 @@ define (require, exports, module) ->
             @expire = if options.expire? then options.expire else "window"
             @encrypt = if options.encrypt? then options.encrypt else true
             @proxy = if options.proxy? then options.proxy else null
+            @insert_guarantee = if options.guarantee then options.guarantee else false
             @engine = new Engine {
                 expire: @expire
                 encrypt: @encrypt
                 name: @name
                 proxy: @proxy
+                insert_guarantee: @insert_guarantee
             }
 
         # get options