舉個例子
保存如下代碼
<script>
var r=prompt("輸入圓的半徑","0");
if(r!=null)
{
var square=r*r*Math.PI;
document.write("圓的面積為："+square);
console.group('Area calc');
console.log("radius ",r);
console.log("square ",square);
console.groupEnd()
}
else
{
alert("yowu")
}
</script>
之后在瀏覽器打開console抗楔，
image.png
