用原生js给一个按钮绑定两个点击事件

------用事件监听事件来实现-----

 <button>按钮</button>
    <script>
        var but = document.querySelector("button")
        //添加监听事件
        but.addEventListener("click",hello1)
        but.addEventListener("click",hello2)
        function hello1(){
            alert("hello1")
        }
        function hello2(){
            alert("hello2")
        }
    </script>