localstorage进行setItem，Chrome报DOM Exception

"Error: An attempt was made to add something to storage that exceeded the quota.
    at Object.$.ajax.success (http://127.0.0.1:8001/static/seg/js/storage.js:29:34)
    at jQuery.Callbacks.fire (http://127.0.0.1:8001/static/js/jquery-1.7.2.js:1075:30)
    at Object.jQuery.Callbacks.self.fireWith [as resolveWith] (http://127.0.0.1:8001/static/js/jquery-1.7.2.js:1193:7)
    at done (http://127.0.0.1:8001/static/js/jquery-1.7.2.js:7538:14)
    at jQuery.ajaxTransport.send.callback (http://127.0.0.1:8001/static/js/jquery-1.7.2.js:8324:8)
    at Object.jQuery.ajaxTransport.send (http://127.0.0.1:8001/static/js/jquery-1.7.2.js:8332:7)
    at Function.jQuery.extend.ajax (http://127.0.0.1:8001/static/js/jquery-1.7.2.js:7719:15)
    at Project._setEventDictToStorage (http://127.0.0.1:8001/static/seg/js/storage.js:17:11)
    at HTMLDocument.<anonymous> (http://127.0.0.1:8001/analysis/Pirates/segmentation:71:16)
    at jQuery.Callbacks.fire (http://127.0.0.1:8001/static/js/jquery-1.7.2.js:1075:30)"

在我用localstorage进行setItem时， chrome报出如上错误。这是一个DOM exception的错误~

最终发现原来LocalStorage对于单条限制大小不能超过5M，（事实上2M的时候就已经setItem不成功了~~~囧）；

当初美好的想将一些数据存储到localstorage的思路现在出现了极大问题；

localstorage只适合存储那些不怎么变化的数据，或者下次还能被再次使用的数据。对于经常需要变动的数据，还是直接从后台取才是王道。

 见博文：

http://www.cnblogs.com/zjcn/archive/2012/07/03/2575026.html  localStorage兼容方案实现

http://www.cnblogs.com/sniper007/archive/2012/10/30/2746299.html   浏览器本地数据（sessionStorage、localStorage、cookie）与server端数据