js获取指定的cookie的具体实现

复制代码 代码如下:
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 {//如果cookie的值是空
alert("not cookie!!!");
}

复制代码 代码如下:
//去除空格
String.prototype.trim = function () {
return this.replace(new RegExp("(^[\s]*)|([\s]*$)", "g"), "");
}