js部分
<script type="text/javascript">
var countdown=60;
function settime(obj) {
if (countdown == 0) {
obj.removeAttribute("disabled");
obj.value="免费获取验证码";
countdown = 60;
return;
} else {
obj.setAttribute("disabled", true);
obj.value="重新发送(" + countdown + ")";
countdown--;
}
setTimeout(function() {
settime(obj) }
,1000);
}
function dd(){
var obj = document.getElementById("test1");
obj.innerHTML="";
var nullOp = document.createElement("option");
nullOp.setAttribute("value", "");
nullOp.appendChild(document.createTextNode("请选择"));
obj.appendChild(nullOp);
for ( var int = 0; int < 1; int++) {
var op = document.createElement("option");
op.setAttribute("value", "123");
op.appendChild(document.createTextNode("123"));
obj.appendChild(op);
}
});
</script>
html部分
<input type="button" id="btn" value="免费获取验证码" onclick="settime(this)" />
<input type="text" id="dd" onclick="dd()" value="sdf" />