Javascript回车跟换焦点

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 1.回车方法

    function keyDown(docs,callback) {
        docs.onkeydown = function(e) {
            if (!e) e = window.event; //火狐中是 window.event
            if ((e.keyCode || e.which) == 13) {
                if (typeof callback == "function") {
                    callback();
                }
            }
        }
    }

2.调用

    var names, pass = null;
    onload=function() {
        names = document.getElementById("username");
        pass = document.getElementById("password");
        names.focus();
        keyDown(names, function () { pass.focus(); });
        keyDown(pass, function () { SaveUser(); });

    }