HTML: Form表单

"en">

  "UTF-8">
  "X-UA-Compatible" content="IE=edge">
  "viewport" content="width=device-width, initial-scale=1.0">
  


  
"">
    "text" name="username" id="username">
    "password" name="password" id="password">
    "submit" value="submit">
  
  

"en">


  "UTF-8">
  "X-UA-Compatible" content="IE=edge">
  "viewport" content="width=device-width, initial-scale=1.0">
  



  
"">
    "text" name="username" id="username">
    "password" name="password" id="password">
    "submit" value="submit">
  
  

禁止form默认提交,改用ajax提交

"en">


  "UTF-8">
  "X-UA-Compatible" content="IE=edge">
  "viewport" content="width=device-width, initial-scale=1.0">
  



  
"">
    
"display: none;">username&password wrong

    username: "text" name="username" autocomplete="off">

    password: "text" name="password" autocomplete="off">

    submit