document.forms对象集合

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>index</title>
    <style>
        *{
            font-family: 微软雅黑;
        }
    </style>
</head>
<body>
    <form action="go.php">
        <p>用户名:</p>
        <p><input type="text" name='username'></p>
        <p><input type="submit" value="Ok"></p>
    </form>    
    <hr>
    <form action="go2.php">
        <p>用户名:</p>
        <p><input type="text" name='username'></p>
        <p><input type="submit" value="Ok"></p>
    </form>    

    <button id='btn1'>表单1</button>
    <button id='btn2'>表单2</button>
</body>
<script>
btn1=document.getElementById('btn1');
btn2=document.getElementById('btn2');
objs=document.forms;

btn1.onclick=function(){
    objs[0].submit();
}

btn2.onclick=function(){
    objs[1].submit();
}
</script>
</html>
世界上最美的风景，是自己努力的模样