js获取指定的cookie的具体实现

var cookieName = "cookie名字"; var cookieValue = null;//返回cookie的value值 if (document.cookie && document.cookie != '') { var cookies = document.cookie.split(';');//将获得的所有cookie切割成数组 for (var i = 0; i < cookies.length; i++) { var cookie = cookies[i];//得到某下标的cookies数组 if (cookie.substring(0, cookieName.length + 2).trim() == cookieName.trim() + "=") {//如果存在该cookie的话就将cookie的值拿出来 cookieValue = cookie.substring(cookieName.length + 2, cookie.length); break } } } if (cookieValue != "" && cookieValue != null) {//如果存在指定的cookie值 alert(cookieValue); } else {<span style="font-family: Arial, Helvetica, sans-serif;">//如果cookie的值是空</span> alert("not cookie!!!"); }