<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
.changeColor2Pink{
background-color: pink
}
.resetBtn1Color{
background: none
}
</style>
<script type="text/javascript">
window.onload = function () {
var btn1=document.getElementById("btn1")
var btn2= document.getElementById("btn2")
btn1.onclick = function () {
btn1.className="changeColor2Pink"
}
btn2.onclick = function () {
btn1.className = "resetBtn1Color"
btn2.className = "changeColor2Pink"
}
}
</script>
</head>
<body>
<button id="btn1">按钮1</button>
<button id="btn2">按钮2</button>
</body>
</html>
貌似你写的有问题吧,不用写type="button"这句,因为本来就是button标签。<button value="ch1" >选项一</button>
如果不加class或者id,可以这样写:
button{ background-color:#ff0000}
<button class="btn1" value="ch1" >选项一</button>
如果加个class,可以这样写:
.btn1{ background-color:#ffff00}