前端学习-JavaScript学习-cookie

在使用Microsoft edge的时候，运行以下代码会报兼容性错误，但是一直没解决
'content-type' header charset value should be 'utf-8'.
使用chrome不会存储cookie 也没有报错
使用火狐可以成功存储cookie

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8"> 
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <script  >
        function getCookie(cname) {
            var name = cname + "=";
            var ca = document.cookie.split(";");
            for(var i=0;i<ca.length;i++) {
                var c = ca[i].trim();
                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.toGMTString();
            document.cookie = cname + "=" + cvalue + ";" + expires;
        }

        function checkCookie() {
            var user = getCookie("username");
            // delCookie("username");
            if(user != "") {
                alert("welcome, " + user + "!");
            }
            else {
                user = prompt("please input your name: ","");
                if(user!=""&&user!=null) {
                    setCookie("username",user,60);
                }
            }
        }

        //删除cookie
        function delCookie(name){
            var exp = new Date();
            exp.setTime(exp.getTime() - 1);
            var cval = getCookie(name);
            if (cval != null) document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString();
        }

    </script>
</head>
<body onload="checkCookie()">
    
</body>
</html>

关于删除cookie，使用了这个博客里的代码：
JavaScript 删除cookie
其中提到以下方法考虑并不全面，cookie的修改需要四个属性必须匹配：1）.key 2）.domain 3）.path 4）.secure
也就是设置时的4个属性和删除时的4个属性要相匹配

//删除cookie
function delCookie(name){
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval = getCookie(name);
    if (cval != null) document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString();
}