Javascript 为rest api创建post函数时出错

当我尝试使用expressrestapi的post函数时，总是会出现这样的错误

events.js:85
      throw er; // Unhandled 'error' event
        ^
error: column "newuser" does not exist
at Connection.parseE (/Users/Chris/project/opshun/api/node_modules/pg/lib/connection.js:561:11)
at Connection.parseMessage (/Users/Chris/project/opshun/api/node_modules/pg/lib/connection.js:390:17)
at null.<anonymous> (/Users/Chris/project/opshun/api/node_modules/pg/lib/connection.js:92:20)
at TLSSocket.emit (events.js:107:17)
at readableAddChunk (_stream_readable.js:163:16)
at TLSSocket.Readable.push (_stream_readable.js:126:10)
at TCP.onread (net.js:529:20)

HTML文件如下所示：

<form action="/signup" method="post">
    <div>
        <label>Username:</label>
        <input type="text" name="newuser"/><br/>
    </div>
    <div>
        <label>Password:</label>
        <input type="password" name="newpass"/>
    </div>
    <div><input type="submit" value="Sign Up"/></div>
</form>

从错误消息中，错误：列newuser不存在。数据库中是否有该列？

client.query插入usersusername、密码值newser、newpass-请解释一下你认为这条线应该如何工作。在解释什么是username和newuser以及它们之间的区别时要非常小心。

<form action="/signup" method="post">
    <div>
        <label>Username:</label>
        <input type="text" name="newuser"/><br/>
    </div>
    <div>
        <label>Password:</label>
        <input type="password" name="newpass"/>
    </div>
    <div><input type="submit" value="Sign Up"/></div>
</form>