JS中对Cookie的操作

/* This function is used to set cookies */
function setCookie(name,value,expires,path,domain,secure) {
  document.cookie = name + "=" + escape (value) +
    ((expires) ? "; expires=" + expires.toGMTString() : "") +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") + ((secure) ? "; secure" : "");
}

/* This function is used to get cookies */
function getCookie(name) {
    var prefix = name + "="
    var start = document.cookie.indexOf(prefix)

    if (start==-1) {
        return null;
    }
   
    var end = document.cookie.indexOf(";", start+prefix.length)
    if (end==-1) {
        end=document.cookie.length;
    }

    var value=document.cookie.substring(start+prefix.length, end)
    return unescape(value);
}

/* This function is used to delete cookies */
function deleteCookie(name,path,domain) {
  if (getCookie(name)) {
    document.cookie = name + "=" +
      ((path) ? "; path=" + path : "") +
      ((domain) ? "; domain=" + domain : "") +
      "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
}