JS实现清除指定cookies的方法

function GetCookieValue(name) {  var cookieValue = null;  if (document.cookie && document.cookie != '') { var cookies = document.cookie.split(';'); for (var i = 0; i < cookies.length; i++) {   var cookie = jQuery.trim(cookies[i]);   //PYYH=USERNAME=steven&PASSWORD=111111&UserID=1&UserType=1   if (cookie.substring(0, name.length + 1) == (name + '=')) { cookieValue = decodeURIComponent(cookie.substring(name.length + 1)); //USERNAME=steven&PASSWORD=111111&UserID=1&UserType=1 break;   } }  }  return cookieValue;}function DelCookie(name) {  var exp = new Date();  exp.setTime(exp.getTime() + (-1 * 24 * 60 * 60 * 1000));  var cval = GetCookieValue(name);  document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();}function exit() {  DelCookie("PYYH");  window.location.replace("http://localhost:7877/index.aspx");}