How can I implement a ORDER BY sort1 DESC, sort2 DESC logic in an JSON array like such: var items = '[ { "sort1": 1, "sort2": 3, "name" : "a", }, { "sort1": 1, "sort2": 2, "name" : "b", }, { "sort1": 2, "sort2": 1, "name" : "c",
我如何实现一个 ORDER BY sort1 DESC, sort2 DESC 像这样的JSON数组中的逻辑: var items = '[ { "sort1": 1, "sort2": 3, "name" : "a", }, { "sort1": 1, "sort2": 2, "name" : "b", }, { "sort1": 2, "sort2": 1, "name" : "c", } ]'
I have a JSON object that I want to sort by one key first, then by a second key similar to ordering by two columns in SQL. Here is a sample of the JSON I would have: { "GROUPID":3169675, "LASTNAME":"Chantry" } I would like to order all the results by the GROUPID and then by LASTNAME. I've used the JSON sort function to sort by one key but not multiple. Any help would be great. A
我有一个JSON对象,我想先按一个键排序,然后再按第二个键排序,类似于SQL中两列排序。 以下是我将拥有的JSON示例: { "GROUPID":3169675, "LASTNAME":"Chantry" } 我想按GROUPID和LASTNAME排序所有结果。 我使用JSON排序功能来排序一个键,但不是多个。 任何帮助都会很棒。 假设你有一个对象数组: var data = [ { "GROUPID":3169675, "LASTNAME":"Chantry" }, { "GROUPID":3169612, "LASTNAME":"Doe" },
Possible Duplicate: How to detect if a variable is an array When I need to test if variable is an array (for example input argument in a function that could be object or array) I usually use this piece of code typeof(myVar) === 'object' && myVar.length !== undefined; Is this the correct way or is there a more efficient way, considering that even if myVar instanceof Array is faster i
可能重复: 如何检测一个变量是否是一个数组 当我需要测试变量是否是一个数组(例如可以是对象或数组的函数中的输入参数)时,我通常使用这段代码 typeof(myVar) === 'object' && myVar.length !== undefined; 这是正确的方式,还是有更有效的方法,考虑到即使myVar instanceof Array更快,由于iframe问题应该避免? Array.isArray现在可用于ECMAScript 5,因此您可以将它与polyfill一起用于旧版浏览器: if(!Arr
So i have a function that needs to check if an argument is an object, but this fails because: typeof [] // returns 'object' This is a classic javascript gotcha, but i cant remember what to do to actually accept objects, but not arrays. Try something like this : obj.constructor.toString().indexOf("Array") != -1 or (even better) obj instanceof Array All these answers suggesting that you che
所以我有一个函数需要检查一个参数是否是一个对象,但是这个失败是因为: typeof [] // returns 'object' 这是一个经典的JavaScript陷阱,但我不记得该怎么做才能真正接受对象,但不是数组。 尝试这样的事情: obj.constructor.toString().indexOf("Array") != -1 或者(甚至更好) obj instanceof Array 所有这些答案都表明,如果某个对象是“Array”类(即由“Array”构造)的实例,则检查是否真的不是安全的解决方案。
What is the best de-facto standard cross-browser method to determine if a variable in JavaScript is an array or not? Searching the web there are a number of different suggestions, some good and quite a few invalid. For example, the following is a basic approach: function isArray(obj) { return (obj && obj.length); } However, note what happens if the array is empty, or obj actuall
什么是确定JavaScript中的变量是否为数组的最佳事实上的标准跨浏览器方法? 搜索网络有许多不同的建议,一些很好,很多都是无效的。 例如,以下是一个基本的方法: function isArray(obj) { return (obj && obj.length); } 但是,请注意如果数组为空,或者obj实际上不是数组,但实现了长度属性等等会发生什么情况。 那么哪个实现在实际工作中是最好的,跨浏览器并且仍然有效地执行? JS中对象的类型检查通
This question already has an answer here: How do you check if a variable is an array in JavaScript? [duplicate] 24 answers you can use indexOf methd of array https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf if(doingGood.indexOf(target) !== -1){ // do something }
这个问题在这里已经有了答案: 你如何检查一个变量是否是JavaScript中的数组? [复制] 24个答案 你可以使用indexOf方法数组https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf if(doingGood.indexOf(target)!== -1){ // 做一点事 }
This question already has an answer here: How do you check if a variable is an array in JavaScript? [duplicate] 24 answers You could use yourThing.constructor === Array This returns true if yourThing is an array. So you don't have to change Array's prototype. Modifying objects you don't own is widely seen as bad practice. 您可以使用instanceof (MDN文档): var arr = []; if
这个问题在这里已经有了答案: 你如何检查一个变量是否是JavaScript中的数组? [复制] 24个答案 你可以使用 yourThing.constructor === Array 如果yourThing是一个数组,则返回true 。 所以你不必改变Array的原型。 修改你不拥有的对象被广泛认为是不好的做法。 您可以使用instanceof (MDN文档): var arr = []; if (arr instanceof Array) { console.log('this is an array'); }
Possible Duplicate: How do you check if a variable is an array in JavaScript? How can I check if a variable is an array (so I can handle each arrayvalue) or a single arrayvalue? From the MDN page for isArray which is part of the ECMAScript 5 standard: if(!Array.isArray) { Array.isArray = function (arg) { return Object.prototype.toString.call(arg) == '[object Array]'; }; } In many
可能重复: 你如何检查一个变量是否是JavaScript中的数组? 我如何检查一个变量是否是一个数组(所以我可以处理每个数组值)或单个数组值? 从属于ECMAScript 5标准的isArray的MDN页面: if(!Array.isArray) { Array.isArray = function (arg) { return Object.prototype.toString.call(arg) == '[object Array]'; }; } 在很多情况下,你也可以检查是否有.length属性(这通常是jQuery所做的),因为它也可以接受
Possible Duplicates: How do you check if a variable is an array in JavaScript ? What is the best way to check if an object is an array or not in Javascript? How can i tell if a javascript variable is an array? 从昨天开始:检查一个对象是否是数组或不使用Javascript的最佳方法是什么?
可能重复: 你如何检查一个变量是否是JavaScript中的数组? 什么是最好的方法来检查一个对象是否是一个数组或不在Javascript中? 我怎么知道一个JavaScript变量是否是一个数组? 从昨天开始:检查一个对象是否是数组或不使用Javascript的最佳方法是什么?
This question already has an answer here: How do you check if a variable is an array in JavaScript? [duplicate] 24 answers Big guys (Jquery, underscore) do it like this: isArray = Array.isArray || function(obj) { return Object.prototype.toString.call(obj) == '[object Array]'; }; But these are not the droids you're looking for you actually don't need this at all. Don't
这个问题在这里已经有了答案: 你如何检查一个变量是否是JavaScript中的数组? [复制] 24个答案 大个子(Jquery,下划线)这样做: isArray = Array.isArray || function(obj) { return Object.prototype.toString.call(obj) == '[object Array]'; }; 但是,这些不是你正在寻找你的机器人,实际上根本不需要这个。 不要“检查”你的变量 - 只要知道它们。 Array.IsArray会更好用。 还要检查这个被认为有害的in