完成登录功能，用session记住用户名

登录功能完成：

  1. js:设置return
function fnLogin() {
    var oUname = document.getElementById("name");
    var oUpass = document.getElementById("pass");
    var oError = document.getElementById("error_box");
    var isError = true;
    oError.innerHTML = '<br>'
    //
    if (oUname.value.length > 20 || oUname.value.length < 6) {
        oError.innerHTML = "name:6-20位";
        isError = false;
        return isError;
    } else if ((oUname.value.charCodeAt(0) >= 48) && (oUname.value.charCodeAt(0) <= 57)) {
        oError.innerHTML = "first letter.";
        isError = false;
        return isError;
    } else for (var i = 0; i < oUname.value.length; i++) {
        if ((oUname.value.charCodeAt(i) < 48) || (oUname.value.charCodeAt(i) > 57) && (oUname.value.charCodeAt(0) < 97) || (oUname.value.charCodeAt(0) > 122)) {
            oError.innerHTML = "only letter or number";
            isError = false;
            return isError;
        }

    }

    if (oUpass.value.length > 20 || oUpass.value.length < 6) {
        oError.innerHTML = "password:6-20";
        isError = false;
        return isError;

    }
    return isError;
    window.alert("登录成功！")
}

 

  1. html:设置
    1. form
    2. input
<!DOCTYPE html>
<html lang="en">
<head>
{% extends 'test1.html' %}
    <meta charset="UTF-8">
    <title>{% block title %}
    登录界面
    {% endblock %}
    </title>
{% block head %}
<link rel="stylesheet" type="text/css" href="../static/css/deng.css">
    <script src="../static/jsp/deng.js"></script>
{% endblock %}


</head>
<body>
{% block body %}
    <div class="box">
        <h1>登录</h1>
        <form action="{{ url_for('deng') }}" method="post">
              <div class="input_box">
            <input id="name" type="text" placeholder="请输入用户名" name="username">
        </div>
        <div class="input_box">
            <input id="pass" type="password" placeholder="请输入密码" name="password">
        </div>
        <div id="error_box"><br>
        </div>
        <div class="input_box">
            <button onclick="fnLogin()">登录</button>
        </div>
        </form>

    </div>
{% endblock %}

</body>
</html>

 

  1. py:
    1. @app.route设置methods
    2. GET
    3. POST
      1. 读取表单数据
      2. 查询数据库
        1. 用户名密码对：
          1. 记住用户名
          2. 跳转到首页
        2. 用户名密码不对：
          1. 提示相应错误。
@app.route('/deng',methods=['GET','POST'])
def deng():
    if request.method == 'GET':
        return render_template('deng.html')
    else:
        username = request.form.get('username')
        password = request.form.get('password')
        user = User.query.filter(User.username == username).first()
        if user:
            if user.password == password:
                return redirect(url_for('admin'))
            else:
                return 'password error'
        else:
            return 'error username or password'

 

session：

  1. 从`flask`中导入`session`
  2. 设置`SECRET_KEY`
  3. 操作字典一样操作`session`：增加用户名`session['username']=`username
        if user:
            if user.password == password:
                session['user'] = username
                session.permanent = True
            else:
                return redirect(url_for('admin'))

 

posted on 2017-11-21 15:07  043李庆  阅读(114)  评论(0)  编辑  收藏  举报

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