如何在localstorage中存储数组数组？ [英] how to store array of array in localstorage ?

问题描述

如何在localstorage中存储大小不同的数组数组？

解决方案

本地存储基于名称/值对，与所有关联容器一样在Javascript（基本上所有Javascript对象，包括数组，都是这样的关联数组）：

http：/ /en.wikipedia.org/wiki/JavaScript#Dynamic [ ^ ]，

http://en.wikipedia.org/wiki/Associative_arrays [ ^ ]。



请查看它的工作原理： http://diveintohtml5.info/storage.html [ ^ ]。



关联容器没有特定大小：随着您添加数据，大小会增加。让我们看看它如何与整数索引的单个数组一起工作：

 localStorage [ 10 ] =  值@ 10; 
  //  如果您的本地存储空前，您只有一个元素（不是11个或10个） ） 
 
 localStorage [ 111 ] =  值@ 111; 
  //  现在只有两个元素 
 
 alert（localStorage） [ 10 ]）;  //  将显示值@ 10 

同样，您可以拥有数组数组，您可以简单地将其解释为使用复合索引索引的数组，在这种情况下，它可以只是一个对索引：

 localStorage [ 1 ， 13 ] =  值@ [1,13]; 
 localStorage [ 111 ] =  值@ 112\" ;  //  您甚至可以组合1D和2D数组 
 alert（localStorage [ 1 ， 13 ]）;  //  将显示值@ [1,13] 

根据定义，您将获得比预期更多的灵活性：您将获得锯齿状数组： http://en.wikipedia.org/wiki/Jagged_array [ ^ ]。



这就是全部。

-SA

how can i store array of array in localstorage which are different in size?

解决方案

The local storage is based on name/value pairs, like all associative containers in Javascript (essentially all Javascript object, including arrays, are such associative arrays):
http://en.wikipedia.org/wiki/JavaScript#Dynamic[^],
http://en.wikipedia.org/wiki/Associative_arrays[^].

Please see how it works: http://diveintohtml5.info/storage.html[^].

The associated container does not have certain size: the size grows as you add data. Let's see how it works with a single array indexed by integers:

localStorage[10] = "the value @10";
// if your local storage was empty before, you have only one element (not 11 or 10 of them)

localStorage[111] = "the value @111";
// only two elements for now

alert(localStorage[10]); // will display "the value @10"

Likewise, you can have array of arrays, which you can simply interpret as the array indexed with compound index, which can be, in this case, just a pair of indices:

localStorage[1,13] = "the value @[1,13]"; 
localStorage[111] = "the value @112"; // you can even combine 1D and 2D arrays
alert(localStorage[1,13]); // will display "the value @[1,13]"

By definition, you will have more flexibility than you expected: you will get jagged arrays: http://en.wikipedia.org/wiki/Jagged_array[^].

That's all.

—SA

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