javaScript 之Dom操作

1 text 操作

function textOpration() {
            var txt = document.getElementById("txtTest");
            txt.value = txt.value + ":welcome!" ;
        }

2 lable 操作

function lbOpration() {
            document.getElementById("mylbText").innerHTML = ":welcome!";
        }

3 select 操作

//单select 取值
        function showMsg() {
            var sel = document.getElementById("myselect");
            var str = "";
            for (i = 0; i < sel.length; i++) {
                if (sel.options[i].selected) {
                    str += sel.options[i].text + "<br/>";
                }
            }
            document.getElementById("lbTest").innerHTML = str;