有什么细节可以从webkitStorageInfo.queryUsageAndQuota（）获得

问题描述

webkitStorageInfo.queryUsageAndQuota（）用于查找使用HTML5文件系统API存储在文件系统中的文件的使用情况统计信息。任何人都可以给我提供给此函数的回调中可以获得的细节。

 使用控制台替换 function（）{...}  .log.bind（console），你会发现。
 > window.webkitStorageInfo.queryUsageAndQuota（webkitStorageInfo.PERSISTENT，console.log.bind（console））
 undefined //返回值^ 
 0 0 //打印结果，参数0和参数1 
  
回调的解释发现： 
 
 
  interface StorageInfo {
 .... 
 //查询当前配额以及为主机存储多少数据。 
 void queryUsageAndQuota（
 unsigned short storageType，
可选StorageInfoUsageCallback successCallback，
可选StorageInfoErrorCallback errorCallback）; 
 ... 
  
 
 
 
 [NoInterfaceObject，Callback = FunctionOnly] 
接口StorageInfoUsageCallback {
 void handleEvent（ unsigned long long currentUsageInBytes ，
  unsigned long long currentQuotaInBytes ）; 
}; 
因此，第一个数字表示使用了多少个字节，
 
第二个数字显示了配额的大小。
 
webkitStorageInfo.queryUsageAndQuota() is used to find out the usage stats of the files that have been stored in the file system using the HTML5 file system API I suppose. Can anyone give me the details that can be obtained in the callback provided to this function.
window.webkitStorageInfo.queryUsageAndQuota(webkitStorageInfo.PERSISTENT, function() {
   //what all details can be obtained in this function as its arguments?
})
 解决方案 
Replace function(){...} with console.log.bind(console), and you will find out.
> window.webkitStorageInfo.queryUsageAndQuota(webkitStorageInfo.PERSISTENT, console.log.bind(console))
undefined  // Return value of ^
0 0        // Printed results, argument 0 and argument 1
The explanation of the callback is found here:
interface StorageInfo {
  ....
  // Queries the current quota and how much data is stored for the host.
  void queryUsageAndQuota(
      unsigned short storageType,
      optional StorageInfoUsageCallback successCallback,
      optional StorageInfoErrorCallback errorCallback);
  ...
[NoInterfaceObject, Callback=FunctionOnly]
interface StorageInfoUsageCallback {
  void handleEvent(unsigned long long currentUsageInBytes,
                   unsigned long long currentQuotaInBytes);
};
So, the first number indicates how many bytes are used,
the second number shows the quota's size.
                        
这篇关于有什么细节可以从webkitStorageInfo.queryUsageAndQuota（）获得的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！