解决js获取innerHTML无法获取value的问题

<form id="f1">
<input type="text"><input type="text"><input type="text">
<textarea></textarea>
<select></select>
</form>
<button onclick="alert(getHtml(true,'f1'))">获取表单innerHTML</button>
<button onclick="setHTML(false,"f1")">设置div的innerHTML，不做处理</button>
<button onclick="setHTML(true,"f1")">设置div的innerHTML，处理数据并且设置状态</button>
<div id="dv"></div>
<script>
    function setHTML(process,formID) {
        $('#dv').html(getHtml(process, formID));
        if (!window.ActiveXObject && process) { //处理标准浏览器下select对象的option选择问题
            var arr, selector = '', i;
            $('#dv option[selectedx]').each(function () {    $(this).attr('selected', true).removeAttr('selectedx');  });
            //textarea有value属性没用，不会显示在输入框内，需要用js设置过value属性一次
            $('#dv textarea').each(function () { $(this).val(this.getAttribute('value')); });
        }
    }
    function getHtml(process,formID) {
        if (window.ActiveXObject || !process) { return $("#" + formID).html(); }
        else
        {//标准浏览器，需要重新控件的value属性，要不返回容器的innerHTML输入的内容或者选择状态并不会通过innerHTML属性获取到
            $($("#" + formID)[0].elements).each(function () {
                switch (this.tagName) {
                    case 'INPUT':
                    case 'TEXTAREA':
                        switch (this.type)
                        {
                            case 'radio':
                            case 'checkbox':
                                if (this.checked) this.setAttribute('checked', true);
                                else this.removeAttribute('checked'); //要记得删除，要不默认的选择会随innerHTML一起返回
                                break;
                            default:
                                this.setAttribute('value', this.value);
                        }
                        break;
                    case 'SELECT':
                        $('option', this).removeAttr('selectedx').not(':selected').removeAttr('selected').end().filter(':selected').attr('selectedx', 'selected');
                        break;
                }
            });
            return $("#" + formID).html();
        }
    }
</script>