前端学习案例-类数组和Array.from
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>类数组</title>
</head>
<body>
<!-- Array.from -->
<script>
var obj={
0:1,
1:2,
2:3,
length:2
}
// length 决定Array.from长度 obj-伪类 -类似于属猪的一种伪类
var newArr=Array.from(obj)
console.log(newArr)
console.log(newArr.length)
</script>
</body>
</html>// length 决定Array.from长度 obj-伪类 -类似于属猪的一种伪类
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>类数组</title>
</head>
<body>
<!-- Array.from -->
<script>
var obj={
0:1,
1:2,
2:3,
push:[].push
}
// length 决定Array.from长度 obj-伪类 -类似于属猪的一种伪类
obj.push(4)
console.log(obj)
//{0:4,1:2,2:3,push:[].push}
</script>
</body>
</html>