使用 JavaScript 设置 cookie 和获取 cookie [英] Set cookie and get cookie with JavaScript

问题描述

我正在尝试根据我在 HTML 中选择的 CSS 文件来设置 cookie.我有一个包含选项列表的表单，以及不同的 CSS 文件作为值.当我选择一个文件时，它应该会保存到一个 cookie 中大约一个星期.下次打开 HTML 文件时，它应该是您选择的前一个文件.

I'm trying to set a cookie depending on which CSS file I choose in my HTML. I have a form with a list of options, and different CSS files as values. When I choose a file, it should be saved to a cookie for about a week. The next time you open your HTML file, it should be the previous file you've chosen.

JavaScript 代码:

JavaScript code:

function cssLayout() {
    document.getElementById("css").href = this.value;
}


function setCookie(){
    var date = new Date("Februari 10, 2013");
    var dateString = date.toGMTString();
    var cookieString = "Css=document.getElementById("css").href" + dateString;
    document.cookie = cookieString;
}

function getCookie(){
    alert(document.cookie);
}

HTML 代码:

<form>
    Select your css layout:<br>
    <select id="myList">
        <option value="style-1.css">CSS1</option>
        <option value="style-2.css">CSS2</option>  
        <option value="style-3.css">CSS3</option>
        <option value="style-4.css">CSS4</option>
    </select>
</form>

推荐答案

我发现以下代码比其他任何代码都要简单得多:

I find the following code to be much simpler than anything else:

function setCookie(name,value,days) {
    var expires = "";
    if (days) {
        var date = new Date();
        date.setTime(date.getTime() + (days*24*60*60*1000));
        expires = "; expires=" + date.toUTCString();
    }
    document.cookie = name + "=" + (value || "")  + expires + "; path=/";
}
function getCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < ca.length;i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1,c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
}
function eraseCookie(name) {   
    document.cookie = name +'=; Path=/; Expires=Thu, 01 Jan 1970 00:00:01 GMT;';
}

现在，调用函数

setCookie('ppkcookie','testcookie',7);

var x = getCookie('ppkcookie');
if (x) {
    [do something with x]
}

来源 - http://www.quirksmode.org/js/cookies.html

他们今天更新了页面，所以页面中的所有内容都应该是最新的.

They updated the page today so everything in the page should be latest as of now.

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