javascript 从本地存储中清除对象
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clearing objects from localstorage
提问by Alex
with localstorage i have a load of unspecified items saved with dynamic names using a data namespace like so:
使用 localstorage，我有大量未指定的项目，使用动态名称保存，使用数据命名空间，如下所示：
localStorage["myAppName.settings.whatever"] = something.whatever;
//and this:
localStorage["myAppName.data."+dynObj.name] = dynObj.data;
I want to keep the settings but not the data. However I won't ever know what all of the names inside of my data object are so I cannot clear them individually. I need to clear these each time my app is loaded but I must keep the settings so
localstorage.clear()is not an option.
我想保留设置但不保留数据。但是，我永远不会知道我的数据对象中的所有名称是什么，因此我无法单独清除它们。每次加载我的应用程序时，我都需要清除这些，但我必须保留这些设置，所以
localstorage.clear()不是一个选项。
I have tried:
我努力了：
localstorage.removeItem("myAppName.data")
but no dice.
但没有骰子。
Anyone have any thoughts on how to clear dynamically named portions of localstorage?
有人对如何清除本地存储的动态命名部分有任何想法吗？
回答by Niklas
You can loop through the keys in the localStorage and target them with a reg exp:
您可以遍历 localStorage 中的键并使用 reg exp 将它们作为目标：
Object.keys(localStorage)
.forEach(function(key){
if (/^(myAppName.data.)/.test(key)) {
localStorage.removeItem(key);
}
});
Here's a similar question: HTML5 Localstorage & jQuery: Delete localstorage keys starting with a certain word
这是一个类似的问题：HTML5 Localstorage & jQuery: Delete localstorage keys starts with a specific word
回答by Fabrizio Calderan
try something like
尝试类似的东西
var i = localStorage.length, key;
while (i--) {
key = localStorage.key(i);
if (key.slice(0, 19) !== "myAppName.settings.") {
localStorage.remove(key);
}
}
回答by Stefan
Tried something like this?
尝试过这样的事情吗？
// Select current settings
var settings = localStorage["myAppName.settings"] || {};
// Clear localStorage
localStorage.clear();
// Add settings to localStorage
localStorage["myAppName.settings"] = settings;
回答by Dorian
Assuming a this.namespacepresent (in my case 'session') and the underscore library:
假设一个this.namespace礼物（在我的例子中'session'）和下划线库：
_.each(_.keys(localStorage), function(key) {
if (RegExp("^" + this.namespace + "\.").test(key)) {
return localStorage.removeItem(key);
}
});
And with CoffeeScript:
并使用 CoffeeScript：
_.each _.keys(localStorage), (key) ->
if ///^#{@namespace}\.///.test(key)
localStorage.removeItem(key)
