javascript操作cookies，addCookie，getCookie，clearAllCookie等操作

JavaScript对Cookies进行操作，JS对Cookies进行增删改查。删除所有cookie,"=;expires="+newDate().toUTCString()+";path=/");});};获取Cookie函数getCookie(cname){varname=cname+"=";vardecodedCookie=decodeURIComponent(document.cookie);varca=decodedCookie.split(";");for(vari=0;i