js设置cookie过期当前时间减去一秒相当于立即过期

<div class="jb51code">
<pre class="brush:js;">
function ClearCookie() {
var expires = new Date();
expires.setTime(expires.getTime() - 1000); //当前时间减去一秒,相当于立即过期(可以增减)
document.cookie = "appCode='222''';path=/;expires=" + expires.toGMTString() + ""; //expires是对应过期时间的设置,不设这个值,cookie默认在关闭浏览器时失效
document.cookie = "roleID='333''';path=/;expires=" + expires.toGMTString() + "";
document.cookie = "parentMenuID='000''';path=/;expires=" + expires.toGMTString() + "";
document.cookie = "currentMenuName='哈哈''';path=/;expires=" + expires.toGMTString() + "";
}