JavaScript 操作cookie

javascript

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2019-1-8

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javascript操作cookie的demo

<html>
<head>
  <script type="text/javascript">

    function getCookie(c_name) {
      if (document.cookie.length > 0) {
        c_start = document.cookie.indexOf(c_name + "=");
        if (c_start != -1) {
          c_start = c_start + c_name.length + 1;
          c_end = document.cookie.indexOf(";", c_start);
          if (c_end == -1) {
            c_end = document.cookie.length;
          }
          return unescape(document.cookie.substring(c_start, c_end));
        }
      }
      return ""
    }

    function setCookie(c_name, value, second) {
      var mSecond = new Date().getTime();
      mSecond = mSecond + second*1000;
      var exdate = new Date();
      exdate.setTime(mSecond);
      document.cookie = c_name + "=" + escape(value) + ((second == null) ? "" : ";expires=" + exdate.toGMTString())+";path=/";
    }

    function checkCookie() {
      username = getCookie('username');
      if (username != null && username != "") {
        alert('Welcome again ' + username + '!');
      } else {
        username = prompt('Please enter your name:', "");
        if (username != null && username != "") {
          setCookie('username', username, 10);
        }
      }
    }
  </script>
</head>

<body onLoad="checkCookie()">
</body>
</html>