回车变Tab (IE, Chrome)

entry_2_tab.js

document.onkeydown = function(evt) {
    var isie = (document.all) ? true : false;
    var key;
    var srcobj;
    // if the agent is an IE browser， it is easy to do this.
    if (isie) {
        key = event.keyCode;
        srcobj = event.srcElement;
    } else {
        key = evt.which;
        srcobj = evt.target;
    }
    if (key == 13 && srcobj.type != "button" && srcobj.type != "submit" && srcobj.type != "reset" && srcobj.type != "textarea" && srcobj.type != "") {
        if (isie) {
            event.keyCode = 9;
        } else {
            var el = getNextElement(evt.target);
            if (el.type != "hidden") {
                ;   //nothing to do here.
            } else {
                while (el.type == "hidden") {
                    el = getNextElement(el);
                }
            }
            if (!el) {
                return false;
            } else {
                el.focus();
            }
 　　　　　　//把提交按钮retrun 为false
            return false;
        }
    }
};

function getNextElement(field) {
    var form = field.form;
    for (var e = 0; e < form.elements.length; e++) {
        if (field == form.elements[e]) {
            break;
        }
    }
    return form.elements[++e % form.elements.length];
}