完成注册功能

1.js文件： onclick函数return True时才提交表单，return False时不提交表单

   function fnRegist() {
        var oUpass = document.getElementById('upass').value;
        var oUpass1 = document.getElementById('upass1').value;
         if (oUpass.value.length < 6 || oUpass1.value.length > 12) {
             oError.innerHTML = '密码请在6到12位之间';
             return false;
         }else if (oUpass != oUpass1) {
            document.getElementById("error_box").innerHTML = "两次密码不一致";
            return false;

        }
        return true;

    }

2.html文件：

1.<form>中设置 action和method="post"

2.<input> 中设置 name

<form action="{{ url_for('regist') }}" id="lg-form" name="lg-form" method="post">

        <div>
            <label for="username">Username:</label>
                <input type="text" name="username" autocomplete="off" placeholder="请输入登录用户名">

        </div>
        <div>
            <label for="username">nickname:</label>
                <input type="text" name="nickname" autocomplete="off" placeholder="请输入昵称">

        </div>
        <div>
        <label for="phonenumber">phonenumber:</label>
              <input type="text" name="phonenumber" autocomplete="off" placeholder="手机号码" >
        </div>
        <div>
              <label for="password">Password:</label>
              <input type="password" id="upass" name="password" autocomplete="off" placeholder="设置密码" >
        </div>
        <div>
              <label for="password1">Password1:</label>
              <input type="password" id="upass1" name="password" autocomplete="off" placeholder="确认密码" >
        </div>

        <div id="error_box"></div>
        <button type="submit" id="regist" onclick="fnRegist()">注册</button>

    </form>

3.主py文件中：

from flask import  request, redirect, url_for

@app.route('/regist/', methods=['GET', 'POST’])

@app.route('/regist/',methods=['GET','POST'])
def regist():
    if request.method=='GET':
        return render_template('regist.html')
    else:
        username = request.form.get('username')
        password = request.form.get('password')
        nickname = request.form.get('nickname')
        phonenumber = request.form.get('phonenumber')
        user =User.query.filter(User.username==username).first()
        if user:
            return  'username existed'
        else:
            user=User(username=username,password=password,nickname=nickname,phonenumber=phonenumber)
            db.session.add(user)   #数据库操作
            db.session.commit()
            return redirect(url_for('login'))