<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>扩展运算符应用</title>
</head>
<body>
<div>1</div>
<div>2</div>
<div>3</div>
<div>4</div>
</body>
<script>
/*利用扩展运算符将伪数组转成真数组*/
var oDivs= document.getElementsByTagName('div');
console.log(oDivs)
console.log( oDivs instanceof Array) //判断是不是真数组
let arr =[...oDivs];
console.log(arr)
console.log(arr instanceof Array)
</script>
</html>