Javascript 需要基于布尔表达式在页面加载时显示/隐藏div元素

我正在尝试加载一个基于本地存储表达式的div，该表达式存储在访问网页之前。例如，如果布尔值为true，那么显示div的简单方法是什么？我看了很多例子，但大多数都有点让人困惑

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谢谢。

您只需在localStorage上检查变量即可

var item = window.localStorage.getItem('item') === "true";
if(item){
    //load your div;
}else{
    //do stuff
}

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这里有两个简单的帮助函数，可以帮助您将对象/布尔值等保存到localStorage

function SetObject(key, value) {
    /// <summary>
    /// Sets object to localStorage as <key, value> pair
    /// This function will automatically stringify given object.
    /// </summary>
    /// <param name="key">Key object</param>
    /// <param name="value">Value object</param>

    try  {
        localStorage.setItem(key, JSON.stringify(value));
        console.log("Set Data [" + key + "] Value");
        console.log(value);
    } catch (exception) {
        if (exception.name === 'QUOTA_EXCEEDED_ERR' || exception.name === 'NS_ERROR_DOM_QUOTA_REACHED') {
            console.error("Quota exceeded! Clear localStorage to solve problem. WARNING: Clearing localStorage will delete all user data.");
        } else {
            console.error("Unknown error while trying to set an item \"" + key + "\" with value: ");
            console.log(value);
        }
    }
};

function GetObject(key) {
    /// <summary>
    /// Gets object from localStorage as value for given key
    /// This function will automatically parse localStorage value and return object type
    /// </summary>
    /// <param name="key">Key object</param>
    /// <returns>Object from localStorage that corresponds to given key</returns>

    var value = localStorage.getItem(key);
    var parsedValue = value && JSON.parse(value);
    console.log("Get Data [" + key + "] of Value");
    console.log(parsedValue);
    return parsedValue;
};

// This will be executed when document DOM finished loading
$(document).ready(function() {
    // Retrieve 'SomePropertyKey' value from localStorage and 
    // compare check if it's 'true'
    if (GetObject("SomePropertyKey") == true) {
        // jQuery call to change div's style 'display' to value 'block'
        $("#divId").show();
    }
});

HTML

。。。

您是否在使用某种DOM操作框架（例如jQuery）？技术说明：localStorage只存储文本。如果你认为你存储的是一个表达式或布尔值，那么请注意事实并非如此。

expression

你指的是像

a>50&&b-5==3之类的布尔值表达式还是什么？我指的是布尔值表达式true或false是的，你是对的。起初我以为他只想检查该项是否在本地存储上持久化。谢谢你的更正，所以我必须检查这个字符串，而不是布尔值？是的。正如@T.J.Crowder和Mike所说，localStorage只将iTen存储为Strings。你说得对，@T.J.Crowder，很抱歉，我有点空洞无物today@AlexandreWiechersVaz：哈哈！
<div id="divId" style="display: none;">...</div>