javascript中cookie的简单使用案例

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<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Insert title here</title><script type="text/javascript">                <!--           Cookie用来识别用户       -->         <!--创建和存储Cookie -->       function setCookie(c_name,value,expiredays){        var exdate = new Date();        exdate.setDate(exdate.getDate()+expiredays);        document.cookie=c_name + "=" + escape(value) +         ((expiredays==null) ? "" : ";expires="+exdate.toGMTString())       }              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 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,365);          }          }       }            </script></head><body onload="checkCookie()">     </body></html>

1 document.cookie对象对cookie进行相关操作

2 与服务器端的交互图解

3 扩展阅读

https://developer.mozilla.org/en-US/docs/Web/API/Document/cookie

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