How to use cookies to record temporary visitor information in JavaScript _ javascript skills

This article mainly introduces how JavaScript uses cookies to record temporary visitor information. It involves javascript cookie operations and is very useful, for more information about how to use cookies to record temporary visitor information, see the example in this article. Share it with you for your reference. The specific analysis is as follows:

Here, the user will prompt the user to enter a nickname when accessing the webpage for the first time, and then write the cookie. When the user comes again, the cookie information will be read and the user nickname will be extracted.

《script》function getCookie(c_name){var c_value = document.cookie;var c_start = c_value.indexOf(" " + c_name + "=");if (c_start == -1) { c_start = c_value.indexOf(c_name + "="); }if (c_start == -1) { c_value = null; }else { c_start = c_value.indexOf("=", c_start) + 1; var c_end = c_value.indexOf(";", c_start); if (c_end == -1)  {  c_end = c_value.length;  } c_value = unescape(c_value.substring(c_start,c_end)); }return c_value;}function setCookie(c_name,value,exdays){var exdate=new Date();exdate.setDate(exdate.getDate() + exdays);var c_value=escape(value) + ((exdays==null) ? "" : "; expires="+exdate.toUTCString());document.cookie=c_name + "=" + c_value;}function checkCookie(){var 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,365);  } }}《script》

I hope this article will help you design javascript programs.