為什么沒有彈窗
<!DOCTYPE? HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>數(shù)組</title>
<script type="text/javascript">
?//創(chuàng)建數(shù)組
?var arr=new Array('*','##',"***","&&","****","##*");
?var arr[7]="**";
?//顯示數(shù)組長度
?alert(arr.length);
?
?//將數(shù)組內(nèi)容輸出，完成達到的效果。
</script>
</head>
<body>
</body>
</html>
2018-02-26
var arr[7]="**";
arr[7] = "**";
2018-02-26
?//創(chuàng)建數(shù)組
?var arr=new Array('*','##',"***","&&","****","##*"); ?//這是有錯誤的
要么創(chuàng)建?
var arr = new Array();
arr = ['*','##',"***","&&","****","##*"];
?要么 直接賦值 ?var arr = ['*','##',"***","&&","****","##*"];?