js 操作cookie

 // 添加cookie
  function addCookie(name,value)
 {
        var str = name +"="+escape(value);
        document.cookie = str;
}
// 取得cookie
 function getCookie(name)
{
        var str=document.cookie.split(";")
        for(var i=0;i<str.length;i++){
        var str2=str[i].split("=");
        if(str2[0].trim()==name.trim())return unescape(str2[1]);
}

// 去字符串空格
String.prototype.trim = function() {   
            return this.replace(/^\s+/g,"").replace(/\s+$/g,"");    
 }