顯示這行代碼出錯了？att.setAttribute("class","one");
<button??id?=?"id"?type="button"?name="a">你好，我是寶寶</button>
<script>
????var?att?=?document.getElementsByName("a");
????att.setAttribute("class","one");
</script>
<style>
????.one{
????????color:?red;
????}
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2021-07-26
<button??id?=?"id"?type="button"?name="a" onclick="fun1">你好，我是寶寶</button>
<script>
????function fun1(){
????????var?att?=?document.getElementsByName("a");
????????att.setAttribute("class","one");
????}
</script>
<style>
????.one{
????????color:?red;
????}