如何添加DOM 0級事件
<script?type="text/javascript">
???function?count(){
????var?txt1?=?parseFloat(document.getElementById("txt1").value);
????var?txt2?=?parseFloat(document.getElementById("txt2").value);
????var?select?=?document.getElementById("select").value;
????var?s
????
????switch(select)
????{
????????case?"+":
????????????s=txt1+txt2;
????????break;
????????case?"-":
????????????s=txt1-txt2;
????????break;
????????case?"*":
????????????s=txt1*txt2;
????????break;
????????case?"/":
????????????s=txt1/txt2;
????????break;
????}
document.getElementById("fruit").value?=?s;
?????
????}
????
?????var?btn?=?document.getElementById("btn").value;
?????btn.onclick?=?count;
??</script>在這里應該如何給按鈕添加DOM 0級事件
2016-07-27
你這里不是已經添加了嗎？