以下是我的代码，其中我尝试将每个数组项的大小减少2，一旦数组的特定值变为0或-1，我将用{{替换它1}}。
示例 -
输入 - undefined
输出 -
[5,4,4,2,2,8]代码（不知怎的，它作为一个无限循环） -
Array Non Blank Values
5 4 4 2 2 8 6
3 2 2 _ _ 6 4
1 _ _ _ _ 4 2
_ _ _ _ _ 3 1
_ _ _ _ _ _ DONE
让我知道我在这里做错了什么。
答案 0 :(得分：3)
问题是，您在<!DOCTYPE html>
<!-- WARNING : modifying login.jsp may affect the login layout for Mobile, Embedded and Desktop Version. -->
<html>
<head>
<!-- Import header for script/style ... -->
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta http-equiv="Cache-Control" content="no-cache"/>
<meta http-equiv="Expires" content="-1" />
<meta http-equiv="Content-type" content="text/html;charset=UTF-8">
<link type="image/x-icon" rel="shortcut icon" href="resources/images/favicon.ico">
<link type="text/css" rel="stylesheet" href="resources/style/login.css">
<style type="text/css">
body{
background: url(resources/images/gradient_body_login.png) repeat-x;
background-color: #d3d3d3;
}
#container{
background: url(resources/images/background_body.png) no-repeat top;
width:1090px;
min-height:770px;
height:auto;
}
#container{
margin:auto;
margin-top:0;
}
#login input[type="submit"],#login input[type="button"]{
margin:10px 5px 10px 0;
}
#mask{
opacity: 0.5;
filter: alpha(opacity = 50);
}
</style>
<script type="text/javascript" src="resources/script/live.js"></script>
<script type="text/javascript">
<!-- Against XFS attack -->
if(top != self)
{top.location=self.location;}
<!-- Against XFS attack -->
function Start(){
DisplayContent();
GiveFocus("j_username");
<!-- Check login failed -->
var vars = getUrlParameters();
var loginLabel = document.getElementById("failureIndication");
var authFailed = vars["authfailed"];
if (authFailed === "true")
loginLabel.innerHTML = "Login Failed";
<!-- Check login failed -->
}
function DisplayContent() {
var mainFrame = document.getElementById("hasJavascript");
mainFrame.style.display = 'block';
}
function GiveFocus(id){
document.getElementById(id).focus();
}
function setSubmitUrl(form){
var hash = getUrlHash();
if((hash != null) && (hash != "")) {
form.action = "j_spring_security_check#" + hash;
}else {
form.action = "j_spring_security_check";
}
return true;
}
</script>
<!-- Sample of custom logo -->
<style type="text/css">
h2 {
background: url("resources/large.png") no-repeat 20px 0 transparent;
line-height: 20px;
padding-left: 170px;
background-size: 75px 33px !important;
background-position: 35px 0px !important;
}
body {
font-family:Verdana;font-size:12px;color:#444;margin:0;padding:0;width:100%;height:100%;
background-color: #5BBF19 !important;
background-attachment: fixed !important;
background-repeat: no-repeat !important}
}
#mask {
display: none !important;
}
#login{
border:4px solid #008800 !important
}
</style>
<title>
Portal Login
</title>
</head>
<body OnLoad="Start();">
<noscript>
<div class="noJavascriptBox">
Your web browser must have JavaScript enabled
in order for this application to display correctly.
</div>
</noscript>
<div id="hasJavascript" class="hidden contentContainer">
<div id="container">
<div id="mask"></div>
<div id="login">
<h2>Portal Live Login</h2>
<form id="login_form" method="POST" onSubmit="return setSubmitUrl(this);">
<label for="j_username">Username:</label>
<input type="text" id="j_username" name="j_username" autocapitalize="off" autocorrect="off"/>
<label for="j_password">Password:</label>
<input type="password" id="j_password" name="j_password" autocapitalize="off" autocorrect="off"/>
<label id="failureIndication"> </label>
<input type="submit" value="OK"/>
</form>
</div>
</div>
</div>
</body>
上调用了makeItemUndefine，但这并没有改变，因为您将结果分配给名为arr的其他变量。所以你实际上并没有随着时间的推移减少数组中的数字。
正确的解决方案是：
result代码的另一个问题是，您尝试从未定义的数字中减去这些数字，并将其转换为while(itemNum != 0) {
num ++;
arr = makeItemUndefine(arr);
itemNum = countItemNotUndefined(arr);
}
。有两种解决方案，要么检查NaN内的NaN，要么检查地图内的countItemNotUndefined。