列出localstorage [英] Listing localstorage

问题描述

$ b $ pre $ function save（title，url）
{
为（var i = 1; i< localStorage.length; i ++）
{
localStorage [saved-title_+ i +] = title;
localStorage [saved-url_+ i +] = url;



函数listFavs（）
{
for（var i = 1; i< localStorage.length; i ++）{
console.log（localStorage [saved-fav-title_+ i +））;当有人点击这个时，save（）会发生：




/ p>

  onclick =save（\''+ title +'\'，\''+ tab.url +' \'）;> '+ title +'< / a>'; 
  

但是 ...不显示保存的localStorages，如何我应该让它工作？

解决方案

可能是因为你正在使用键'已保存-title_'+ i 保存值，'saved-fav-title_'+ i 来检索它？

区别在于 fav - 部分。

你的localStorage的枚举必然会产生错误不能保证它里的所有项目都有一个与'saved-fav-title_'+ i 提供的模式相匹配的密钥 - 实际上它保证不会如你所愿你自己输入的项目是'saved-url _'+ i 形式的键

想要用一个匹配模式的键正确枚举项目使用

 函数listFavs（）{
 var key; 
 for（var i = 0，len = localStorage.length; i< len; i ++）{
 key = localStorage.key（i）; 
 if（（/^saved-fav-title_/).test(key））{
 console.log（localStorage.getItem（key）; 
} 
} 
} 
  

I did my own feature using this:

function save(title, url)
{
 for (var i = 1; i < localStorage.length; i++) 
 {
  localStorage["saved-title_" + i + ""] = title;
  localStorage["saved-url_" + i + ""] = url;
 } 
}

function listFavs()
{
 for (var i = 1; i < localStorage.length; i++) {
    console.log(localStorage["saved-fav-title_" + i + ""]);
 }
}

save() happens when someone clicks on this:

onclick="save(\'' + title + '\', \'' + tab.url + '\');"> ' + title + '</a>';

However... it doesn't show the saved localStorages, how am I supposed to make it work?

解决方案

Might it be because you are using the key 'saved-title_' + i to save the value and 'saved-fav-title_' + i to retrieve it?

The difference is the fav- part.

And your enumeration of the localStorage is bound to create errors as there is no guarantee that all items in it have a key that matches the pattern provided 'saved-fav-title_' + i - actually it is guaranteed to not be so as you are yourself inputting items with keys in the form of 'saved-url_'+ i.

So, if you want to properly enumerate the items with a key matching a pattern use

function listFavs(){
    var key;
    for (var i = 0, len = localStorage.length; i < len; i++){
        key = localStorage.key(i);
        if ((/^saved-fav-title_/).test(key)) {
            console.log(localStorage.getItem(key);
        }
   }
}

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