form通过ajax以json发送，接受json数据做处理, js获取cookie值

{% extends "base.html" %}

{% block title %}register{% end %}
{% block head %}
    <script type="text/javascript" src="{
    
    { static_url('js/jquery-1.12.4.min.js') }}"></script>

    <script type="text/javascript">
        function getSteamId(){
			var c_name = 'steamname';
			if(document.cookie.length>0){
			   c_start = document.cookie.indexOf(c_name + "=")
			   if(c_start!=-1){
			     c_start=c_start + c_name.length+1
			     c_end=document.cookie.indexOf(";",c_start)
			     if(c_end==-1) c_end=document.cookie.length
			     return unescape(document.cookie.substring(c_start,c_end));
			   }
			}
		}

        function register() {
            var username = document.getElementById("user_name").value;
            var password = document.getElementById("pass_word").value;
            var c_password = document.getElementById("c_password").value;
            var mobile = document.getElementById("mobile").value;
            var steam_id = getSteamId()
            $.ajax({
                type: "POST",
                dataType: "json",
                url: '/user/register',
                contentType: "application/json",
                data:JSON.stringify({
                    "username": username,
                    "password": password,
                    "c_password": c_password,
                    "mobile": mobile,
                    "steam_id": steam_id,
                }),
                success: function (result) {
                    if (result.code == 200) {
                        window.location.href = "/";
                    }else {
                        alert(result.message)
                    }
                }
            });
        }
    </script>


{% end %}

{% block content %}
    <h1 style="text-align: center">
        {
    
    { data }}
    </h1>

    <form>
        <p>用户名：<input type="text" id="user_name" name="username"  placeholder="用户名"></p>
        <p>密码(*)：<input type="password" id="pass_word" name="password"  placeholder="密码"></p>
        <p>确认密码(*)：<input type="password" id="c_password" name="c_password"  placeholder="确认密码"></p>
        <p>手机号(*)：<input type="text" id="mobile" name="mobile"  placeholder="手机号"></p>
        <input type="button" value="注 册"  onclick="register()">
        <a href="/user/login"><input type="button" value="登录"></a>
    </form>
{% end %}