87,996
社区成员




<button type="button" id="btn1" onclick="fun1()" >改变</button>
<script>
var arr = ['red', '#fff', '#000', '颜色']
function fun1()
{
var index = Math.floor(Math.random()*arr.length)
document.getElementById("btn1").style.background=arr[index];
}
</script>