Nodejs下用submit提交表单提示cannot post错误的解决方

<span style="font-size:18px;"><form action="/registOK" method="get"> 
<p>用户名：<input type="text" id="userName" name="userName"></p> 
<p>密码：<input type="password" id="passWord" name="passWord"></p> 
<p><input type="submit" value="注册" id="zhuce"></p></form></span> 

app.get("/registOK",function (req,res,next) { 
res.render("registOK"); 
}); 

<span style="font-size:18px;">app.post("/registOK",function (req,res,next) { 
res.render("registOK"); 
});</span>