我对使用函数传递的'socket'参数感到困惑(在'enigma'部分中).然后参数使用'socket.on'.io.on和socket.on有什么区别？
以下代码略微改编自Socket.io聊天应用程序示例.
变量
var http = require('http');
var express = require('express');
var app = express();
var server = http.createServer(app)
var io = require('socket.io').listen(server);
谜
io.on('connection', function (socket) {
console.log('user connected');
socket.on('message', function(msg) {
console.log('message: ' + msg);
io.emit('message', msg);
})
});
启动服务器
server.listen(3000, function() {
console.log('server is running');
});
index.jade
body
script(src="/socket.io/socket.io.js")
form(method='post', action="/")
input(type='text', id='user', autocomplete='off')
input(type='submit', onClick="myFunc()")
strong messages:
p(id="messages")
script.
var socket = io();
socket.on('message', function(msg) {
console.log('client: ' + msg);
});
function myFunc() {
var text …出于某种原因,我无法隐藏<br>仅在小屏幕尺寸上显示的标签.它不会出现在小屏幕上.它适用于其他屏幕尺寸.它适用于其他标签.有关<br>屏幕尺寸小的标签的东西.
<div class="row">
<img src="static/works_3.jpg" class="img-responsive works-photo col-md-4 col-sm-12"><br class="hidden-xs hidden-md hidden-lg">
<img src="static/works_3.jpg" class="img-responsive works-photo col-md-4 col-sm-12"><br class="hidden-xs hidden-md hidden-lg">
<img src="static/works_3.jpg" class="img-responsive works-photo col-md-4 col-sm-12"><br class="hidden-xs hidden-md hidden-lg">
</div>
当我点击提交按钮时,我正在尝试打印Flask中的复选框值.
app.py片段:
@app.route('/test2', methods=['GET', 'POST'])
def test2():
if request.method == "POST":
if request.form['submit'] == 'submit':
print(request.args.get('check'))
return render_template('test.html')
HTML:
<div class="container"><br>
<form role="form" method="post">
<input type="checkbox" name="check" value="test">
<button type="submit" name="submit" value="submit">Submit</button>
</form>
</div>
点击提交按钮后返回"无".
我也试过request.form.get()
@app.route('/test2', methods=['GET', 'POST'])
def test2():
if request.method == "POST":
if request.form['submit'] == 'submit':
print(request.form.get('check'))
return render_template('test.html')
这也返回'无'.
我想用空格替换回车符，以便用户可以键入（？是用户按回车键）：
These?
are?
some?
words.
它将转换为：
These are some words.
然后我想使用 .split() 从这些单词中创建一个数组。所以所需的输出应该是：
["These", "are", "some", "words."]
我收到的输出是：
["These?are?some?words."]
我有两个清单:
seller = ["Bob", "Joe", "Tim"]
cash = [12, 25, 67]
我在模板中传递了两个参数:
...
return render_template("sales.html", sellers=sellers, seller_cash=seller_cash)
我想在同一个循环中呈现两个参数:
{% for seller in sellers %}
<p><strong>{{seller}}: {{cash}}</p>
{% endfor %}
显然,这不起作用.有没有办法在同一个循环中有两个参数？
在BeautifulSoup中，您可以使用soup.find_all进行搜索。例如，我使用搜索了一个页面
soup.find_all("tr", "cat-list-row1")
显然，这带来了每个名为cat-list-row1的tr类。我想知道是否有可能在整个页面中搜索名为“ cat-list-row1”的任何类，而不是仅将其限制为元素为“ tr”的类。
表单的操作将输入发送到名为soldfor的路由.我试图将变量ID传递给soldfor.当我点击提交按钮时,我收到此错误:
TypeError:soldfor()只取1个参数(给定0)
register_results.html的渲染:
return render_template('register_results.html', results=results, ID=ID)
register_results.html:
<form role="form" method="POST" action="{{ url_for('soldfor', ID={{ ID }}) }}">
<div class="input-group">
<input type="number" class="form-control" placeholder="Sold For" autocomplete="off" name="soldfor">
<span class="input-group-btn">
<button class="btn btn-default" name="soldfor" value="soldfor" type="submit">Sell!</button>
</span>
</div>
</form>
soldfor路线:
@app.route("/soldfor", methods=["POST"])
def soldfor(ID):
soldfor = request.form['soldfor']
print(soldfor)
g.db = connect_db()
g.db.execute("UPDATE yardsale SET SF = ? WHERE ID = ?", (soldfor, ID,))
g.db.commit()
g.db.close()
return redirect(url_for('index'))