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<style>
.change-bg {
border: 1px solid black;
height: 40px;
width: 120px;
border-radius: 2px;
margin-top: 16px;
outline: none;
cursor: pointer;
}
.change-bg:active {
background: #efefef;
}
.box {
width: 120px;
height: 120px;
background: #4caf50;
border-radius: 60px;
}
</style>
<div class="box"></div>
<button class="change-bg">戳這里改變背景色</button>
<script>
var boxEle = document.querySelector('.box');
var btnEle = document.querySelector('.change-bg');
// 隨機生成一個顏色 具體實現可以不管
function getColor() {
return '#' + ('00000' + (Math.random() * 0x1000000 << 0).toString(16)).slice(-6);
}
btnEle.onclick = function() {
boxEle.style.backgroundColor = getColor();
};
</script>
運行結果