                        課程
                    
                        /前端開發(fā)
                        
                            /JavaScript
                        
                        /JavaScript進(jìn)階篇

為什么順序是0 7 2 4？？？?完全不理解

April123_

2015-02-20

源自：JavaScript進(jìn)階篇 3-8

關(guān)注問題我要回答

1112

操作

收起

1 回答

derrick9006
2015-02-21

題目給的數(shù)值是

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

arr[7] = "**";

而array里面拆開得到的數(shù)值是

arr[0] = *

arr[1] = ##

arr[2] = ***

arr[3] = &&

arr[4] = ****

arr[5] = ##*

所以你得到0724

但我覺得這樣寫會比較符合題目要求

<!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?=?['*','##',"***","&&","****","##*"];
?//顯示數(shù)組長度
?var?length?=?arr.length;
?arr[7]?=?"**";
?
?//將數(shù)組內(nèi)容輸出，完成達(dá)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>