js 年份选择

<select class="drop-down">

</select>

<script type="text/javascript">
var dropDown = document.getElementsByClassName('drop-down')[0];
for(var i = 1970;i<2019;i++){
var textnode = document.createTextNode(i+"年");
var options = document.createElement('option');
options.appendChild(textnode);
dropDown.appendChild(options);
}
</script>