如何設置和讀取Cookie JavaScript

我試圖在首次訪問它時在我的網站上顯示一個彈出窗口。但之後沒有任何其他時間。所以我試圖用cookies來製作它。但我絕對沒有運氣。如何設置和讀取Cookie JavaScript

我試過下面的W3學校的教程，但我沒有得到任何地方。我在做什麼時，用戶關閉對話框，它設置一個cookie。而且我試圖讓它回來時，彈出窗口不會顯示，因爲cookie已設置。

這是我的代碼。

function setCookie(cname,cvalue,exdays) { 
 
    var d = new Date(); 
 
    d.setTime(d.getTime()+(exdays*24*60*60*1000)); 
 
    var expires = "expires="+d.toGMTString(); 
 
    document.cookie = cname + "=" + cvalue + "; " + expires; 
 
} 
 

 
function getCookie(cname) { 
 
    var name = cname + "="; 
 
    var ca = document.cookie.split(';'); 
 
    for(var i=0; i<ca.length; i++) { 
 
    var c = ca[i].trim(); 
 
    if (c.indexOf(name)==0) 
 
     return c.substring(name.length,c.length); 
 
    } 
 
    return ""; 
 
} 
 

 
function checkCookie() { 
 
    var username=getCookie("username"); 
 
    if (username!="") { 
 
    $('#firsttimee').css({display : 'none'}); 
 
    } else { 
 
    if (username=="" || username==null) { 
 
     $('#firsttimee').css({display : 'block'}); 
 
    } 
 
    } 
 
} 
 
     
 
function closepop(){ 
 
    $('#firsttimee').css({display : 'none'}); 
 
    var username = 'seen'; 
 
    setCookie("username",username,365);  
 
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
 
<div id="firsttimee"> 
 
    <div id="firsttimetxt"> 
 
    <center> 
 
     <a href="http://blah.com/" id="bottomex">Click here</a>.<br><br> 
 
     <a href="javascript:closepop()" id="bottomex">Done</a> 
 
    </center> 
 
    </div> 
 
</div>

提前感謝！ :) Here is a jsfidddle of my current work, for some reason when you click done the popup doesn't go away..

來源

2014-04-02 Darryl Huffman

使用從MDN而不是W3Schools的cookie腳本，看起來像W3Schools沒有設置路徑。

var docCookies = { 
    getItem: function (sKey) { 
    return decodeURIComponent(document.cookie.replace(new RegExp("(?:(?:^|.*;)\\s*" + encodeURIComponent(sKey).replace(/[\-\.\+\*]/g, "\\$&") + "\\s*\\=\\s*([^;]*).*$)|^.*$"), "$1")) || null; 
    }, 
    setItem: function (sKey, sValue, vEnd, sPath, sDomain, bSecure) { 
    if (!sKey || /^(?:expires|max\-age|path|domain|secure)$/i.test(sKey)) { return false; } 
    var sExpires = ""; 
    if (vEnd) { 
     switch (vEnd.constructor) { 
     case Number: 
      sExpires = vEnd === Infinity ? "; expires=Fri, 31 Dec 9999 23:59:59 GMT" : "; max-age=" + vEnd; 
      break; 
     case String: 
      sExpires = "; expires=" + vEnd; 
      break; 
     case Date: 
      sExpires = "; expires=" + vEnd.toUTCString(); 
      break; 
     } 
    } 
    document.cookie = encodeURIComponent(sKey) + "=" + encodeURIComponent(sValue) + sExpires + (sDomain ? "; domain=" + sDomain : "") + (sPath ? "; path=" + sPath : "") + (bSecure ? "; secure" : ""); 
    return true; 
    }, 
    removeItem: function (sKey, sPath, sDomain) { 
    if (!sKey || !this.hasItem(sKey)) { return false; } 
    document.cookie = encodeURIComponent(sKey) + "=; expires=Thu, 01 Jan 1970 00:00:00 GMT" + (sDomain ? "; domain=" + sDomain : "") + (sPath ? "; path=" + sPath : ""); 
    return true; 
    }, 
    hasItem: function (sKey) { 
    return (new RegExp("(?:^|;\\s*)" + encodeURIComponent(sKey).replace(/[\-\.\+\*]/g, "\\$&") + "\\s*\\=")).test(document.cookie); 
    }, 
    keys: /* optional method: you can safely remove it! */ function() { 
    var aKeys = document.cookie.replace(/((?:^|\s*;)[^\=]+)(?=;|$)|^\s*|\s*(?:\=[^;]*)?(?:\1|$)/g, "").split(/\s*(?:\=[^;]*)?;\s*/); 
    for (var nIdx = 0; nIdx < aKeys.length; nIdx++) { aKeys[nIdx] = decodeURIComponent(aKeys[nIdx]); } 
    return aKeys; 
    } 
};

，並設置cookie

docCookies.setItem("username",username,"Infinity");

，並獲得該cookie

docCookies.getItem("username") //returns the string

或

docCookies.has("username") //return boolean

來源

2014-04-02 12:17:37 epascarello

我通常使用下面的代碼爲：

function getCookie(cookieName) { 
    var i, x, y, cookiesArray = document.cookie.split(";"); 
    for (i = 0; i < cookiesArray.length; i++) { 
     x = cookiesArray[i].substr(0, cookiesArray[i].indexOf("=")); 
     y = cookiesArray[i].substr(cookiesArray[i].indexOf("=") + 1); 
     x = x.replace(/^\s+|\s+$/g, ""); 
     if (x == cookieName) { 
      return unescape(y); 
     } 
    } 
} 

function checkCookie() { 
    hideCookieDiv(); 
    var myCookie = getCookie("yourcookiename"); 
    if (myCookie == null || myCookie != "true") { 
     showCookieDiv(); 
     setCookie(); 
    } 
} 

function hideCookieDiv() { 
    document.getElementById('YourDivId').style.display = "none"; 
} 

function showCookieDiv() { 
    document.getElementById('YourDivId').style.display = "block"; 
} 

function setCookie() { 
    var expirationDate = new Date(); 
    expirationDate.setDate(expirationDate.getDate() + 365); 
    document.cookie = "yourcookiename=true; expires=" + expirationDate.toUTCString(); 
}

來源

2014-04-02 12:17:44 Natalia

如何設置和讀取Cookie JavaScript

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