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``` <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <script> //设置cookie function setCookie(cname, cvalue, exdays) { var d = new Date(); d.setTime(d.getTime() + (exdays*24*60*60*1000)); var expires = "expires="+d.toUTCString(); document.cookie = cname + "=" + cvalue + "; " + expires; } //获取cookie function getCookie(cname) { var name = cname + "="; var ca = document.cookie.split(';'); for(var i=0; i<ca.length; i++) { var c = ca[i]; while (c.charAt(0)==' ') c = c.substring(1); if (c.indexOf(name) != -1) return c.substring(name.length, c.length); } return ""; } //清除cookie function clearCookie(name) { setCookie(name, "", -1); } //初始化方法 function checkCookie() { var user = getCookie("username"); if (user != "") { console.log("Welcome again " + user); } else { user = prompt("Please enter your name:", ""); if (user != "" && user != null) { setCookie("username", user, 365); } } } setCookie('a','a',2); setCookie('e','e3',1); setCookie('f','fz',1); //获取含有 名字 的cookie; function contain(name){ var containCookie = document.cookie.split("; "); for(var i=0;i<containCookie.length;i++){ var c=containCookie[i]; if (c.indexOf(name) != -1) return c=c.split('=')[0]; } } console.log('包含3的cookie名字为:',contain('3')) </script> </body> </html> ```