怎样用php+ajax实现用户登录按钮加载

1 <form onsubmit="return check_login()" style="text-align: center;margin-top:50px"> 
2     <input value="登 录"   class="btn_submit" id="btn_submit" type="submit"> 
3 </form>

 1 .btn_submit { 
 2     background-color: #e31436; 
 3     color: #fff; 
 4     cursor: pointer; 
 5     display: inline-block; 
 6     font-size: 18px; 
 7     height: 44px; 
 8     line-height: 44px; 
 9     text-align: center; 
10     width: 200px; 
11     border-radius: 2px; 
12     border:none 
13 } 
14 .disabled{opacity: 0.5;cursor:default}

 1 function check_login() { 
 2     if ($("#btn_submit").hasClass("disabled"));//避免重复提交  3     return false; 
 4     $("#btn_submit").addClass("disabled").val("正在提交"); 
 5     $.post("login.php", {id: 1}, function(data) { 
 6         $("#btn_submit").removeClass("disabled").val("登 录"); 
 7         location.href = "http://www.sucaihuo.com/php/2747.html"; 
 8     }, "json"); 
 9     return false; 
10 }