如何点击Button改变颜色

Question

鼠标点击Button1改变颜色，点击Button2恢复颜色，Button2改变颜色

Answer 1

html代码:
按钮1
按钮2
js原生代码:
window.onload = function(){
document.getElementById("btn1").onclick=function(){
this.style.background = "red";
document.getElementById("btn2").style.background = '#FFF';
}
document.getElementById("btn2").onclick=function(){
this.style.background = "red";
document.getElementById("btn1").style.background = '#FFF';
}
}