JS获取、修改、查询Cookie-CFANZ编程社区

JS获取、修改、查询Cookie
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>菜鸟教程(runoob.com)</title>
  </head>

  <head>
    <script>
      function setCookie(cname, cvalue, exdays) {
        var d = new Date();
        d.setTime(d.getTime() + exdays * 24 * 60 * 60 * 10000);
        var expires = "expires=" + d.toGMTString();
        document.cookie = cname + "=" + cvalue + "; " + expires;
        console.log("cookie:", document.cookie);
      }
      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 checkCookie() {
        var user = getCookie("username");
        if (user != "") {
          alert("欢迎 " + user + " 再次访问");
        } else {
          user = prompt("请输入你的名字:", "");
          if (user != "" && user != null) {
            setCookie("username", user, 30);
          }
        }
      }
    </script>
  </head>

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