前台js操作cookie的方法

function getCookie(cname) {
  var name = cname + "=";
  var ca = document.cookie.split(';');
  for(var i = 0; i < ca.length; i++) {
    var c = ca[i];
    while(c.charAt(0) == ' ') c = c.substring(1);
    if(c.indexOf(name) == 0) return c.substring(name.length, c.length);
  }
  return "";
}


function setCookie(cname, cvalue, exdays) {
  var d = new Date();
  d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
  var expires = "expires=" + d.toUTCString();
  document.cookie = cname + "=" + cvalue + "; " + expires + ";path=/";
}


//调用示例
setCookie("name", "value", "expire");

getCookie("xxx");