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- 轮询:每2秒钟发送请求。
- 长轮询:最多hang住30s(兼容性好)
- 实时
- 在线
代码实现:
app.py设置
from flask import Flask,render_template,request,jsonify,session
import uuid
import queue
app = Flask(__name__)
app.secret_key = 'asdfasdfasd'
USERS = {
'1':{'name':'twiss','count':1},
'2':{'name':'gkate','count':0},
'3':{'name':'iran','count':0},
}
QUEQUE_DICT = {
# 'asdfasdfasdfasdf':Queue()
}
@app.route('/user/list')
def user_list():
user_uuid = str(uuid.uuid4())
QUEQUE_DICT[user_uuid] = queue.Queue()
session['current_user_uuid'] = user_uuid
return render_template('user_list.html',users=USERS)
@app.route('/vote',methods=['POST'])
def vote():
uid = request.form.get('uid')
USERS[uid]['count'] += 1
for q in QUEQUE_DICT.values():
q.put(USERS)
return "投票成功"
@app.route('/get/vote',methods=['GET'])
def get_vote():
user_uuid = session['current_user_uuid']
q = QUEQUE_DICT[user_uuid]
ret = {'status':True,'data':None}
try:
users = q.get(timeout=5)
ret['data'] = users
except queue.Empty:
ret['status'] = False
return jsonify(ret)
if __name__ == '__main__':
app.run(threaded=True)
user_list.html
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>Title</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
li{
cursor: pointer;
}
</style>
</head>
<body>
<ul id="userList">
{% for key,val in users.items() %}
<li uid="{{key}}">{{val.name}} ({{val.count}})</li>
{% endfor %}
</ul>
<script src="https://cdn.bootcss.com/jquery/3.3.0/jquery.min.js"></script>
<script>
$(function () {
$('#userList').on('click','li',function () {
var uid = $(this).attr('uid');
$.ajax({
url:'/vote',
type:'POST',
data:{uid:uid},
success:function (arg) {
console.log(arg);
}
})
});
get_vote();
});
/*
获取投票信息
*/
function get_vote() {
$.ajax({
url:'/get/vote',
type:"GET",
dataType:'JSON',
success:function (arg) {
if(arg.status){
$('#userList').empty();
$.each(arg.data,function (k,v) {
var li = document.createElement('li');
li.setAttribute('uid',k);
li.innerText = v.name + "(" + v.count + ')' ;
$('#userList').append(li);
})
}
get_vote();
}
})
}
</script>
</body>
</html>
- websocket实现(兼容性不太好)