提示整个窗体的文本颜色

function appendit()
{
    var nodes = document.getElementsByTagName("INPUT");
    for (var i=0; i<nodes.length; i++)
    {
        var ctype = nodes[i].getAttribute("type");
       
        if (ctype == 'text' && !nodes[i].getAttribute("readonly"))
        {
            nodes[i].onfocus = function () { this.style.backgroundColor='#ffff00'; }
            nodes[i].onblur = function () { this.style.backgroundColor='#ffffff'; }//this.style.fontSize='0.7em'; this.style.color='#000'; this.style.height='14px'; this.style.marginTop='1px'; }
        }
    }
   
    nodes = document.getElementsByTagName("select");
    for (var i=0; i<nodes.length; i++)
    {
        nodes[i].onfocus = function () { this.style.backgroundColor='#ffff00'; }
        nodes[i].onblur = function () { this.style.backgroundColor='#ffffff'; }//this.style.fontSize='0.7em'; this.style.color='#000'; this.style.height='14px'; this.style.marginTop='1px'; }
    }
   
    nodes = document.getElementsByTagName("textarea");
    for (var i=0; i<nodes.length; i++)
    {
        nodes[i].onfocus = function () { this.style.backgroundColor='#ffff00'; }
        nodes[i].onblur = function () { this.style.backgroundColor='#ffffff'; }
    }
}