Html Chrome表单提交发布数据视图源不工作

在chrome中查看这些代码并进行调试

<?php 
if(!isset($_POST['submit'])) 
   { 
   echo "<form method='POST'><input type=submit name='submit'></form>"; 
   } else { 
   echo "You Can't view the source of THIS LINE using Chrome."; 
   }   
?>