动态驱动onChange事件简单问题
<select name="t" onChange="if(this.options[this.selectedindex].value == 3)alert('hello')">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<script language="javascript">
document.all.t.value = '3';
document.all.t.change();//这句有错,想动态驱动onChange事件
</script>