<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script type="text/javascript">
var arr=["小明","小张","小韦"]; //注意直接赋值用中括
document.write("arr0：",arr,"<br>");
//1、修改数组数据
arr[1]="老六";
document.write("arr1：",arr,"<br>");
//2、添加数据
arr[3]="老六";
document.write("arr2：",arr,"<br>");
arr[arr.length]="老七";
document.write("arr3：",arr,"<br>");
arr[arr.length]="老八";
document.write("arr4：",arr,"<br>");
</script>
</head>
<body>
</body>
</html>