表單提交enter觸發提交

<div>
    <label for="username">用戶名：</label><input type="text" id="username" value="123">
</div>
<div>
    <label for="password">密  碼：</label><input type="password" id="password" value="123"></div>
<button id="sousou">提交</button>

var e =e|| window.event;
document.onkeydown = function(e){
    if ((e.keyCode || e.which) == 13){
	    var data={
		    username:$("#username").val(),
		    password:$("#password").val()
	    }
	    console.log(data);
						
    }
}