This question already has an answer here: How does !!~ (not not tilde/bang bang tilde) alter the result of a 'contains/included' Array method call? 13 answers What does a tilde do when it precedes an expression? 6 answers Bitwise Operators ~a Performs the NOT operator on each bit. Example: 9 (base 10) = 00000000000000000000000000001001 (base 2) ~9 (base 10) = 11111111111
这个问题在这里已经有了答案： !!〜（不是不用颚化/砰砰砰砰声）改变'contains / included'数组方法调用的结果吗？ 13个答案 在表达式之前，代字号在做什么？ 6个答案 按位运算符 一个〜 每位执行NOT运算符。 例： 9（基数10）= 00000000000000000000000000001001（基数2） 〜9（基数10）= 11111111111111111111111111110110（基数2）= -10（基数10）
This question already has an answer here: How to: The ~ operator? 4 answers How does !!~ (not not tilde/bang bang tilde) alter the result of a 'contains/included' Array method call? 13 answers what does “~” operator do in this script? As others have pointed out, it's the bitwise NOT operator. Which is all well and good, but what's it doing in this script was the questio
这个问题在这里已经有了答案： 如何：〜运营商？ 4个答案 !!〜（不是不用颚化/砰砰砰砰声）改变'contains / included'数组方法调用的结果吗？ 13个答案 这个脚本中的“〜”操作符做了什么？ 正如其他人指出的那样，它是一个按位运算符。 这一切都很好，但是在这个剧本中它的作用就是这个问题。 :-) 这个想法可能与你所说的完全相同：如果index是一个数字，则进行splice 。 ~操作符对其操作数的第一件事情是
the list looks like: 3434,346,1,6,46 How can I append a number to it with javascript, but only if it doesn't already exist in it? Assuming your initial value is a string (you didn't say). var listOfNumbers = '3434,346,1,6,46', add = 34332; var numbers = listOfNumbers.split(','); if(numbers.indexOf(add)!=-1) { numbers.push(add); } listOfNumbers = numbers.join(','); Basically i co
该列表看起来像： 3434,346,1,6,46 我如何在javascript中附加一个数字，但只有当它不存在时才使用它？ 假设你的初始值是一个字符串（你没有说）。 var listOfNumbers = '3434,346,1,6,46', add = 34332; var numbers = listOfNumbers.split(','); if(numbers.indexOf(add)!=-1) { numbers.push(add); } listOfNumbers = numbers.join(','); 基本上我将字符串转换为数组，使用indexOf（）检查值的存在，只有当它不存在
I have a string with space-separated unique numbers as following: "2 4 13 14 28 33" Need a quick and efficient way to switch a pair of them in form: switchNumbers(2, 28) // result: "28 4 13 14 2 33" I could split the string and search for values, but that sounds boring. Any better idea? 也请尝试： var numbers = "2 4 13 14 28 33"; function switchNum(from, to){ return numbers.replace(/d
我有一个由空格分隔的唯一编号的字符串，如下所示： "2 4 13 14 28 33" 需要一种快速有效的方式在窗体中切换一对： switchNumbers(2, 28) // result: "28 4 13 14 2 33" 我可以分割字符串并搜索值，但这听起来很无聊。 有什么更好的想法 也请尝试： var numbers = "2 4 13 14 28 33"; function switchNum(from, to){ return numbers.replace(/d+/g, function(num){ return num == from ? to : num == to ? from
Is it possible to limit a user's selection to the predefined data-source items for a Bootstrap Typeahead item? So if the user types something that is not in the data-source, a message is be displayed notifying them as such? Here's the demo: http://cruiseoutlook.com/test If I understand, when the typeahead component loses the focus, the user should be alerted that its input is invalid
是否可以将用户的选择限制为Bootstrap Typeahead项目的预定义数据源项目？ 因此，如果用户键入不在数据源中的内容，则会显示一条消息，通知他们这样的内容？ 这里是演示：http://cruiseoutlook.com/test 如果我明白，当类型组件失去焦点时，如果它不在列表中，应该提醒用户它的输入无效？ 代码将因此是这样的： var myData = [...]; // This array will contain all your possible data for the typeahead $("#my-type-a
Following an old question, I still have a problem: a = ["apple", "banana", "orange", "apple"]; a.indexOf("apple") = 0 What is the easiest way to find BOTH indexes of "apple" element in array? I want to delete them both at once - is it possible? 这是筛选方法的任务： var noApples = a.filter(function(el) { return el != "apple"; }) What is the easiest way to find BOTH indexes of "
在一个老问题之后，我仍然有一个问题： a = ["apple", "banana", "orange", "apple"]; a.indexOf("apple") = 0 在数组中找到“apple”元素的BOTH索引的最简单方法是什么？ 我想一次删除它们 - 有可能吗？ 这是筛选方法的任务： var noApples = a.filter(function(el) { return el != "apple"; }) 在数组中找到“apple”元素的BOTH索引的最简单方法是什么？ 你问了，但也询问了删除。 我将首先处理索引，然后删除。 索引：
I often have the need to search a javascript array that contains objects. I want to search for an object in the array that has a property match. For example, searching an array of Person objects for where the person's id/key === "ABC123" It can be done pretty easily using jQuery using the $.each method, which is what I settled on. You can see the example here in jsFiddle. http
我经常需要搜索包含对象的JavaScript数组。 我想搜索数组中具有属性匹配的对象。 例如，在Person对象的数组中搜索该人的id / key ===“ABC123” 使用$ .each方法使用jQuery可以轻松完成，这正是我所解决的问题。 你可以在jsFiddle中看到这个例子。 http://jsfiddle.net/johnpapa/EJAFG/ 我想知道是否有其他人找到了更快和/或更好的方法来做到这一点？ var Person = function(code, name) { this.code = code; this
After searching for an answer in other posts, I felt I have to ask this. I looked at How do I check if an array includes an object in JavaScript? and Best way to find if an item is in a JavaScript array? and couldn't get the code there to work. I am capturing an html embed code into an array, so each item is a line of html code. for example: i[0]='<param name="bgcolor" value="#FFFF
在其他帖子中寻找答案后，我觉得我必须问这个。 我看了如何检查数组是否包含JavaScript中的对象？ 以及如何查找某个项目是否在JavaScript数组中的最佳方法？ 并且无法让代码在那里工作。 我将一个html嵌入代码捕获到一个数组中，因此每个项目都是一行html代码。 例如： i[0]='<param name="bgcolor" value="#FFFFFF" />' i[1]='<param name="width" value="640" />' i[2]='<param name="height" value="36
This question already has an answer here: Best way to find if an item is in a JavaScript array? [duplicate] 8 answers indexOf() returns the index in the array of the element you're searching for, or -1. So you can do: var index = drawOrder.indexOf("aKey"); if (index != -1) drawOrder.splice(index, 1); Splice: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Globa
这个问题在这里已经有了答案： 找到一个项目是否在JavaScript数组中的最佳方法？ [复制] 8个答案 indexOf（）返回要搜索的元素的数组中的索引，或-1。 所以你可以这样做： var index = drawOrder.indexOf("aKey"); if (index != -1) drawOrder.splice(index, 1); 拼接： https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice 指数： http://www.w3schools.com/jsr
This question already has an answer here: Best way to find if an item is in a JavaScript array? [duplicate] 8 answers How do I check if an array includes an object in JavaScript? 40 answers The correct syntax is if(!condition){ expression(); } Note that you need parenthesis around the condition. @plalx wants a formal definition, and here you go: IfStatement: if(Expression) St
这个问题在这里已经有了答案： 找到一个项目是否在JavaScript数组中的最佳方法？ [复制] 8个答案 如何检查数组是否包含JavaScript中的对象？ 40个答案 正确的语法是 if(!condition){ expression(); } 请注意，您需要在条件附近使用括号。 @plalx想要一个正式的定义，在这里你去： IfStatement: if(Expression) Statement else Statement if(Expression) Statement 在任何歧义的情况下， else将与最近