<form>
<button onclick="fn1()">问候先生</button>
<button onclick="alert('小姐,您好!');">问候小姐</button>
</form>
<script>
function fn1(){
alert("先生,你好");
}
</script>
<form>
<button onclick="fn1()">问候先生</button>
<button onclick="alert('小姐,您好!');">问候小姐</button>
</form>
<script>
function fn1(){
alert("先生,你好");
}
</script>