<body>
<button>按钮1</button>
<button>按钮2</button>
<button>按钮3</button>
<button>按钮4</button>
<button>按钮5</button>
</body>
<script>
var btns = document.getElementsByTagName("button");
for(var i = 0; i < btns.length;i++) {
btns[i].onclick = function() {
for(var i = 0;i<btns.length;i++) {
btns[i].style.background = ‘‘;
}
this.style.backgroundColor = "pink";
}
}
</script>
