用上下文处理器app_context_processor定义函数
- 获取session中保存的值
- 返回字典
@app.context_processor def mycontext(): username=session.get('user') if username: return {'username':username} else: return {}
在父模板中更新导航，插入登录状态判断代码。、
- 注意用{% ... %}表示指令。
- {{ }}表示变量
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>
首页
{% block logintitle %}{% endblock %}
{% block registertitle %}{% endblock %}
{% block wendatitle %}{% endblock %}
</title>
<script>
function mySwitch() {
var oBody = document.getElementById("myBody");
var oOnoff = document.getElementById("myOnOff");
if (oOnoff.src.match("bulbon")) {
oOnoff.src = "http://www.runoob.com/images/pic_bulboff.gif";
oBody.style.background = "black";
oBody.style.color = "yellow";
} else {
oOnoff.src = "http://www.runoob.com/images/pic_bulbon.gif";
oBody.style.background = "lightcyan";
oBody.style.color = "black";
}
}
</script>
<link rel="stylesheet" type="text/css" href="../static/css/moban.css">
{% block loginhead %}{% endblock %}
{% block registerhead %}{% endblock %}
{% block wendahead %}{% endblock %}
</head>
<body id="myBody" style=" padding: 0px; line-height: 1.8; color: rgb(128, 0, 0);">">
<nav>
<img src="{{ url_for('static',filename='image/gzsxy.png') }}" alt="" width="20px">
<script>
document.write(Date())
</script>
<br>
<a href="{{ url_for('moban') }}">首页</a>
{% if username %}
<a href="#">{{ username }}</a>
<a href="{{ url_for('logout') }}">注销</a>
{% else %}
<a href="{{ url_for('login') }}">登录</a>
<a href="{{ url_for('register') }}">注册</a>
{% endif %}
<a href="{{ url_for('wenda') }}">问答</a>
<input type="text" placeholder="请输入关键字">
<button type="submit">搜索</button>
</nav>
<p>{{ username }}context</p>
{% block loginbody %}{% endblock %}
{% block registerbody %}{% endblock %}
{% block wendabody %}{% endblock %}
</body>
</html>
完成注销功能。
- 清除session
- 跳转
@app.route('/logout/') def logout(): session.clear() return redirect(url_for('moban'))