需求：
定义以下数组
const bookArr=[ { id:1, bookName:"三国演义" },
{ id:2, bookName:"水浒传" },
{ id:3, bookName:"红楼梦" },
{ id:4, bookName:"西游记" }]
找出id为3的一项，并且在控制台上输出”红楼梦”.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>2.查找数组</title>
</head>
<body>
<script>
const bookArr=[ { id:1, bookName:"三国演义" },
{ id:2, bookName:"水浒传" },
{ id:3, bookName:"红楼梦" },
{ id:4, bookName:"西游记" }]
const bookInfo = bookArr.find((item,index) => {
return item.id == 3
})
console.log(bookInfo.bookName)
</script>
</body>
</html>
打印输出：
