出于多种原因(不良做法、安全问题等)，您不应该使用客户端 javascript 访问数据库，但如果您真的想这样做，这里是一个例子:

You shouldn´t use client javascript to access databases for several reasons (bad practice, security issues, etc) but if you really want to do this, here is an example:

var connection = new ActiveXObject("ADODB.Connection") ;

var connectionstring="Data Source=<server>;Initial Catalog=<catalog>;User ID=<user>;Password=<password>;Provider=SQLOLEDB";

connection.Open(connectionstring);
var rs = new ActiveXObject("ADODB.Recordset");

rs.Open("SELECT * FROM table", connection);
rs.MoveFirst
while(!rs.eof)
{
   document.write(rs.fields(1));
   rs.movenext;
}

rs.close;
connection.close; 

连接到 sql 服务器的更好方法是使用一些服务器端语言，如 PHP、Java、.NET 等.客户端 javascript 应仅用于接口.

A better way to connect to a sql server would be to use some server side language like PHP, Java, .NET, among others. Client javascript should be used only for the interfaces.

并且有关于服务器javascript存在的古老传说的传言，但这是另一回事.;)

And there are rumors of an ancient legend about the existence of server javascript, but this is another story. ;)