让innerHTML获取的内容包含input和select(option)的最新值

function refreshData(){ 
    var allInputObject=document.body.getElementsByTagName("input");
    for (i = 0; i < allInputObject.length; i++) {
        if(allInputObject[i].type=="checkbox")  {
                if (allInputObject[i].checked ) 
                       allInputObject[i].setAttribute("checked","checked"); 
                       else
                    allInputObject[i].removeAttribute("checked");
        }else if(allInputObject[i].type=="radio")  {
                if (allInputObject[i].checked ) 
                       allInputObject[i].setAttribute("checked","checked"); 
                       else
                    allInputObject[i].removeAttribute("checked");
        }else{
            allInputObject[i].setAttribute("value",allInputObject[i].value);
        }
    };
    for (i = 0; i < document.getElementsByTagName("select").length; i++) {
        var sl=document.getElementsByTagName("select")[i];
        for (j = 0; j < sl.options.length; j++) {
        if (sl.options[j].selected) 
                     sl.options[j].setAttribute("selected","selected");
        else sl.options[j]=new Option(sl.options[j].text,sl.options[j].value);
        };
    };
    var textareas = document.body.getElementsByTagName("textarea");
    for (i = 0; i < textareas.length; i++) {
        textareas[i].innerHTML=textareas[i].value;
        textareas[i].style.overflow="hidden";
        textareas[i].style.backgroundAttachment="fixed";
        textareas[i].style.backgroundRepeat="no-repeat";
        textareas[i].style.borderStyle="solid";
        textareas[i].style.borderColor="#FFFFFF";
        textareas[i].style.resize="none";
    }
    var ths = document.body.getElementsByTagName("th");
    for (i = 0; i < ths.length; i++) {
        ths[i].style.border="1px solid #000000";
    }
    var tds = document.body.getElementsByTagName("td");
    for (i = 0; i < tds.length; i++) {
        tds[i].style.border="1px solid #000000";
    }
    var h2s = document.body.getElementsByTagName("h2");
    for (i = 0; i < h2s.length; i++) {
        h2s[i].style.textAlign="center";
    }
    var h1s = document.body.getElementsByTagName("h1");
    for (i = 0; i < h1s.length; i++) {
        h1s[i].style.textAlign="center";
    }
};