1，设置cookie：
　　document.cookie = ‘name=zhangsan‘
2，读取cookie：
　　console.log(document.cookie)（直接读就行）
3，删除cookie：
　　为了删除指定名称的cookie，可以将其过期时间设定为一个过去的时

//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);    
}    
function checkCookie() {  
    var user = getCookie("username");  
    if (user != "") {  
        alert("Welcome again " + user);  
    } else {  
        user = prompt("Please enter your name:", "");  
        if (user != "" && user != null) {  
            setCookie("username", user, 365);  
        }  
    }  
}  
checkCookie();   

1，设置cookie：
　　from flask import make_response
　　@app.route(‘/‘)
　　def index():
    　　resp = make_response(render_template(...))
    　　resp.set_cookie(‘username‘, ‘the username‘)
    　　return resp
2，读取cookie：
　　request.cookies.get(‘username‘)
3,删除cookie：
　　resp.set_cookie(‘username‘, ‘‘, expires=0)