有什么细节可以从webkitStorageInfo.queryUsageAndQuota（）获得 [英] What are the details can be obtained from webkitStorageInfo.queryUsageAndQuota()

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。

  window.webkitStorageInfo.queryUsageAndQuota（webkitStorageInfo。 PERSISTENT，function（）{
 //在这个函数中可以获得的所有细节作为它的参数？
}）
  

解决方案使用控制台替换 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 here ：

  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IT屋！