Turning two elements visible/hidden in the same div

I am having a problem turning one element on and the other off in the same div. It seems I create an object that is supposed to do this, and when I click on it, it hides the entire div instead of turning one element on and one off. What else do I need to add to make this work? CSS #test1 { width:804px; margin-left:auto; margin-right:auto; height:250px; float:left; overflow:hidden; displa

将两个元素可见/隐藏在同一个div中

我遇到了一个问题打开一个元素,另一个关闭在同一个div。 看起来我创建了一个应该这样做的对象,当我点击它时,它隐藏了整个div,而不是将一个元素打开或关闭。 我还需要添加什么来完成这项工作? CSS #test1 { width:804px; margin-left:auto; margin-right:auto; height:250px; float:left; overflow:hidden; display:none; } #test2 { width:804px; margin-left:auto; margin-right:auto; height:250px; float:l

How do you get a timestamp in JavaScript?

How can I get a timestamp in JavaScript? Something similar to Unix's timestamp, that is, a single number that represents the current time and date. Either as a number or a string. var timeStampInMs = window.performance && window.performance.now && window.performance.timing && window.performance.timing.navigationStart ? window.performance.now() + window.performa

你如何获得JavaScript中的时间戳?

我怎样才能在JavaScript中获得时间戳? 类似于Unix的时间戳,即代表当前时间和日期的单个数字。 可以是数字或字符串。 var timeStampInMs = window.performance && window.performance.now && window.performance.timing && window.performance.timing.navigationStart ? window.performance.now() + window.performance.timing.navigationStart : Date.now(); console.log(timeStampInMs, Da

How do I check if an array includes an object in JavaScript?

What is the most concise and efficient way to find out if a JavaScript array contains an object? This is the only way I know to do it: function contains(a, obj) { for (var i = 0; i < a.length; i++) { if (a[i] === obj) { return true; } } return false; } Is there a better and more concise way to accomplish this? This is very closely related to Stack

如何检查数组是否包含JavaScript中的对象?

找出JavaScript数组是否包含对象的最简洁高效的方法是什么? 这是我知道这样做的唯一途径: function contains(a, obj) { for (var i = 0; i < a.length; i++) { if (a[i] === obj) { return true; } } return false; } 有更好更简洁的方法来完成这个吗? 这与Stack Overflow问题密切相关在JavaScript数组中找到一个项目的最佳方法? 它使用indexOf来解决查找数组中的对象的

In JavaScript, what is the difference between indexOf() and search()?

Being fairly new to JavaScript, I'm unable to discern when to use each of these. Can anyone help clarify this for me? If you require a regular expression, use search() . Otherwise, indexOf() is going to be faster. indexOf用于纯粹的子字符串, search可以做正则表达式。 The search function (one description here) takes a regular expression, which allows you to match against more sophistica

在JavaScript中,indexOf()和search()有什么区别?

对于JavaScript来说相当新,我无法辨别何时使用这些。 任何人都可以帮我澄清这一点吗? 如果您需要正则表达式,请使用search() 。 否则, indexOf()会更快。 indexOf用于纯粹的子字符串, search可以做正则表达式。 搜索函数(这里是一个描述)需要一个正则表达式,它允许您匹配更复杂的模式,不区分大小写的字符串等,而indexOf(这里的一个描述)只是简单地匹配一个文字字符串。 但是,indexOf还允许您指定开始索引。

JQuery string contains check

I need to check whether a string contains another string or not? var str1 = "ABCDEFGHIJKLMNOP"; var str2 = "DEFG"; Which function do I use to find out if str1 contains str2? 你可以使用javascript的indexOf函数。 var str1 = "ABCDEFGHIJKLMNOP"; var str2 = "DEFG"; if(str1.indexOf(str2) != -1){ console.log(str2 + " found"); }var str1 = "ABCDEFGHIJKLMNOP"; var str2 = "DEFG"; sttr1.search(str

JQuery字符串包含检查

我需要检查一个字符串是否包含另一个字符串? var str1 = "ABCDEFGHIJKLMNOP"; var str2 = "DEFG"; 我用哪个函数来查明str1是否包含str2? 你可以使用javascript的indexOf函数。 var str1 = "ABCDEFGHIJKLMNOP"; var str2 = "DEFG"; if(str1.indexOf(str2) != -1){ console.log(str2 + " found"); }var str1 = "ABCDEFGHIJKLMNOP"; var str2 = "DEFG"; sttr1.search(str2); 它会返回匹配的位置,如果找不到则返回-1。

What is the !! (not not) operator in JavaScript?

I saw some code that seems to use an operator I don't recognize, in the form of two exclamation points, like so: !! . Can someone please tell me what this operator does? The context in which I saw this was, this.vertical = vertical !== undefined ? !!vertical : this.vertical; Coerces oObject to boolean. If it was falsey (eg 0, null , undefined , etc.), it will be false , otherwise, true

是什么 !! (不)没有运算符在JavaScript中?

我看到一些代码似乎使用了一个我不认识的操作符,以两个感叹号的形式,如下所示: !! 。 有人能告诉我这个操作员做什么吗? 我看到这个背景是, this.vertical = vertical !== undefined ? !!vertical : this.vertical; 强制oObject为布尔值。 如果它是假的(例如0, null , undefined等),则它将是false ,否则是true 。 !oObject //Inverted boolean !!oObject //Non inverted boolean so true boolean representati

How to manage a redirect request after a jQuery Ajax call

I'm using $.post() to call a servlet using Ajax and then using the resulting HTML fragment to replace a div element in the user's current page. However, if the session times out, the server sends a redirect directive to send the user to the login page. In this case, jQuery is replacing the div element with the contents of the login page, forcing the user's eyes to witness a rare sce

如何在jQuery Ajax调用后管理重定向请求

我使用$.post()来使用Ajax调用servlet,然后使用生成的HTML片段替换用户当前页面中的div元素。 但是,如果会话超时,服务器将发送重定向指令以将用户发送到登录页面。 在这种情况下,jQuery正在用登录页面的内容替换div元素,强制用户的眼睛确实见证一个罕见的场景。 我如何使用jQuery 1.2.6从Ajax调用中管理重定向指令? 我读过这个问题,并实现了将响应状态代码设置为278的方法,以避免浏览器透明地处理重定向。 尽管这

Setting "checked" for a checkbox with jQuery?

I'd like to do something like this to tick a checkbox using jQuery : $(".myCheckBox").checked(true); or $(".myCheckBox").selected(true); Does such a thing exist? jQuery 1.6+ Use the new .prop() method: $('.myCheckbox').prop('checked', true); $('.myCheckbox').prop('checked', false); jQuery 1.5.x and below The .prop() method is not available, so you need to use .attr() . $('.myChec

设置“检查”的复选框与jQuery?

我想要做这样的事情来使用jQuery勾选checkbox : $(".myCheckBox").checked(true); 要么 $(".myCheckBox").selected(true); 这样的事情存在吗? jQuery 1.6+ 使用新的.prop()方法: $('.myCheckbox').prop('checked', true); $('.myCheckbox').prop('checked', false); jQuery 1.5.x及以下版本 .prop()方法不可用,所以您需要使用.attr() 。 $('.myCheckbox').attr('checked', true); $('.myCheckbox').attr('checke

each over an array in JavaScript?

How can I loop through all the entries in an array using JavaScript? I thought it was something like this: forEach(instance in theArray) Where theArray is my array, but this seems to be incorrect. TL;DR Don't use for-in unless you use it with safeguards or are at least aware of why it might bite you. Your best bets are usually a for-of loop (ES2015+ only), Array#forEach ( spec |

每个在JavaScript中的数组?

如何使用JavaScript循环访问数组中的所有条目? 我认为这是这样的: forEach(instance in theArray) 凡theArray是我的阵列,但是这似乎是不正确的。 TL; DR 除非您使用保护措施或至少知道它为什么会咬你for-in否则不要使用原装。 你最好的投注通常是 一个for-of循环(仅限ES2015 +), Array#forEach ( spec | MDN )(或其亲属some等)(仅限ES5 +), 一个简单的老式for循环, 或者for-in有保障。 但还有

How do I return the response from an asynchronous call?

I have a function foo which makes an Ajax request. How can I return the response from foo ? I tried returning the value from the success callback as well as assigning the response to a local variable inside the function and returning that one, but none of those ways actually return the response. function foo() { var result; $.ajax({ url: '...', success: function(respo

如何返回来自异步调用的响应?

我有一个函数foo ,它发出一个Ajax请求。 我怎样才能返回foo的回应? 我尝试从success回调中返回值,并将响应分配给函数内的局部变量并返回该变量,但这些方法实际上都没有返回响应。 function foo() { var result; $.ajax({ url: '...', success: function(response) { result = response; // return response; // <- I tried that one as well } });