不加join和加了join有什么区别？
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Array对象 </title>
<script type="text/javascript">
var myarr = new Array(3);
myarr[0] = "I";
myarr[1] = "love";
myarr[2] = "JavaScript";
document.write(myarr);
</script>
</head>
<body>
</body>
</html>
这是第一种
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Array对象 </title>
<script type="text/javascript">
var myarr = new Array(3);
myarr[0] = "I";
myarr[1] = "love";
myarr[2] = "JavaScript";
document.write(myarr.join());
</script>
</head>
<body>
</body>
</html>
这是第二种在document中加入join()
但是屏幕上显示的是加没加join效果都是一样
这个有什么区别吗
