<script>
//设置cookie
function setCookie(name,value,iDay){
    var oDate=new Date();
    oDate.setDate(oDate.getDate()+iDay);
    document.cookie=name+'='+value+';expires='+oDate;
}
//获取cookie
function getCookie(name){
    var arr=document.cookie.split('; ');
    for(var i=0; i<arr.length;i++){
        var arr2=arr[i].split('=');
        if(arr2[0]==name){
            return arr2[1];
        }
    }
    return "";
}
//移除cookie
function removeCookie(name){
    setCookie(name,1,-1);
}
//setCookie('username','张三',60);
//setCookie('password','123445',10);
//alert(getCookie('usersname'));
removeCookie("username");
alert(document.cookie);
</script>
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