为什么顺序是0 7 2 4？？？?完全不理解

个回答

derrick9006: 2015-02-21 02:18:16

已采纳

题目给的数值是

var arr = ['*','##',"***","&&","****","##*"];

arr[7] = "**";

而array里面拆开得到的数值是

arr[0] = *

arr[1] = ##

arr[2] = ***

arr[3] = &&

arr[4] = ****

arr[5] = ##*

所以你得到0724

但我觉得这样写会比较符合题目要求

<!DOCTYPE  HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>数组</title>
<script type="text/javascript">
 //创建数组
 var  arr = ['*','##',"***","&&","****","##*"];
 //显示数组长度
 var length = arr.length;
 arr[7] = "**";
 
 //将数组内容输出，完成达到的效果。
 var row = 4;
 var row_count = 0;
 for(var i=0; i<length; i++){
    row_count++;
    if(row_count<=row){
        if(arr[i].length == i+1){
            if(arr[i].indexOf('*') === -1)
                document.write(arr[7]+"<br>");
            else if(arr[i].length == (i+1)){
                document.write(arr[i]+"<br>");
            }
        }
        else{
            for(var j=0; j<i+1; j++){
                document.write("*");
            }
            document.write("<br>");
        }
    }
 }

</script>
</head>
<body>
</body>
</html>