This question already has an answer here: Loop through an array in JavaScript 35 answers Iterate over an array with for : each array has a length property.Array indexing starts from 0 but length property starts count from 1.So in your for loop you have to set a condition which will iterate until the end of array is reached.for loop to iterate over an array has the following structure fo
这个问题在这里已经有了答案： 在JavaScript中循环访问数组35个答案 使用for循环遍历一个数组： 每个数组都有一个length属性.Array索引从0开始，但length属性从1开始计数。因此，在for循环中，您必须设置一个条件，该条件将迭代到达到数组末尾.for循环遍历数组以下结构 for(i=0;i<array.length;i++){ // in your case it will be fastfood.length //access elements here } ++是一个增量算子，它在
This question already has an answer here: Loop through an array in JavaScript 35 answers Itearting over an array: That's an array of strings, don't use for..in , use the vanilla for loop: var tags = ["Favorite", "Starred", "High Rated"]; for (var i = 0; i < tags.length; i++) { // proper way to iterate an array console.log(tags[i]); } Output: Favorite Starred High Rated Pr
这个问题在这里已经有了答案： 在JavaScript中循环访问数组35个答案 在数组上进行Itearting： 这是一个字符串数组，不要使用for..in ，使用vanilla for循环： var tags = ["Favorite", "Starred", "High Rated"]; for (var i = 0; i < tags.length; i++) { // proper way to iterate an array console.log(tags[i]); } 输出： Favorite Starred High Rated 正确使用for..in ： 它意味着对象的属性，如： var
This question already has an answer here: Loop through an array in JavaScript 35 answers 好吧，我认为它会做你想要的。 function iterObj(obj) { for (var key in obj) { console.log(key + ': ' + obj[key]); if (obj[key] !== null && typeof obj[key] === "object") { // Recurse into children iterObj(obj[key]); } } }
这个问题在这里已经有了答案： 在JavaScript中循环访问数组35个答案 好吧，我认为它会做你想要的。 function iterObj(obj) { for (var key in obj) { console.log(key + ': ' + obj[key]); if (obj[key] !== null && typeof obj[key] === "object") { // Recurse into children iterObj(obj[key]); } } }
Do you think there is a big difference in for...in and for loops? What kind of "for" do you prefer to use and why? Let's say we have an array of associative arrays: var myArray = [{'key': 'value'}, {'key': 'value1'}]; So we can iterate: for (var i = 0; i < myArray.length; i++) And: for (var i in myArray) I don't see a big difference. Are there any performance issues
你认为在...和循环中有很大的不同吗？ 你喜欢用什么样的“for”，为什么？ 假设我们有一组关联数组： var myArray = [{'key': 'value'}, {'key': 'value1'}]; 所以我们可以迭代： for (var i = 0; i < myArray.length; i++) 和： for (var i in myArray) 我没有看到很大的区别。 有没有任何性能问题？ 选择应该基于哪一个习语是最好理解的。 一个数组是迭代使用： for (var i = 0; i < a.length; i++) //do
This Javascript logic puzzles me. I'm creating an array and setting the first element of it to a number. When I interate through it using a "for" loop Javascript turns the array key into a string. Why? I want it to stay a number. stuff = []; stuff[0] = 3; for(var x in stuff) { alert(typeof x); } It's because you're looping through the array using for...in which is
这个Javascript逻辑困惑我。 我正在创建一个数组并将其第一个元素设置为一个数字。 当我使用“for”循环来介绍它时，Javascript会将数组键转换为一个字符串。 为什么？ 我希望它保持一个数字。 stuff = []; stuff[0] = 3; for(var x in stuff) { alert(typeof x); } 这是因为你使用for...in循环数组for...in其中通常用于循环对象的属性。 javascript引擎可能会转换为字符串，因为字符串类型适用于对象属性的名称。
How do you use multiple controllers for AngularJS 1.3.8? I've tried the following below but only the first controller outputs correctly and the second controller outputs with {{ name }} and {{ age }} . HTML: <div ng-app="app" ng-controller="Ctrl"> <label>Name:</label> <input ng-model="name"> <label>Age:</label> <input ng-mode
你如何为AngularJS 1.3.8使用多个控制器？ 我已经尝试了下面的内容，但只有第一个控制器输出正确，第二个控制器输出{{ name }}和{{ age }} 。 HTML： <div ng-app="app" ng-controller="Ctrl"> <label>Name:</label> <input ng-model="name"> <label>Age:</label> <input ng-model="age"> <h1>{{ name }}</h1> <h1>{{ age * 2
I have an Owin self-host C# app that provides Web API services over 127.0.0.1:5555 (it only listens on localhost, no external connections). These Web API services are called using Ajax from an AngularJS app. As an aside: the reason for the Owin app is that certain interaction with the hardware is needed, which is not possible from within a browser. Also, the AngularJS app is for internal use,
我有一个Owin自主主机的C＃应用程序，它提供了超过127.0.0.1:5555的Web API服务（它只能监听本地主机，没有外部连接）。 这些Web API服务是使用AngularJS应用程序中的Ajax调用的。 顺便说一下：Owin应用程序的原因是需要与硬件进行某些交互，而这在浏览器中是不可能的。 此外，AngularJS应用程序供内部使用，所以我可以控制使用的浏览器。 上面的工作比HTTP更好，但Angular JS应用程序需要使用SSL，除非Owin应用程序也使
I'm trying to compile my LESS files using the gulp-useref plugin, but it is as if the gulp-less plugin never outputs a compiled version of my LESS files in the pipeline. The LESS files get concatenated with the other CSS files without being compiled. I tried compiling my LESS separately using only gulp-less and it is working well, but I have no idea why it seems to conflict with the gulp-u
我正在尝试使用gulp-useref插件编译我的LESS文件，但它似乎没有吞没我的LESS文件在管道中的编译版本。 LESS文件与其他CSS文件串联而不被编译。 我试着只编译我的LESS，而且运行良好，但我不知道为什么它似乎与gulp-useref插件冲突。 这是我的gulpfile： var gulp = require('gulp'); var rm = require('gulp-rimraf'); var gulpif = require('gulp-if'); var less = require('gulp-less'); var cssmin = require('gulp-mini
In Gulp, I'm trying to compile TypeScript, concatenate it, then run it through Browserify to handle the require s (then uglify after if in production mode). This sample code is the closest I've found to what I'm trying to do, however it uses an intermediary file. I'd much rather keep things to the stream to avoid the overhead of the intermediary file if at all possible. Since
在Gulp中，我试图编译TypeScript，并将它连接起来，然后通过Browserify运行它来处理require （然后在生产模式下之后的uglify）。 这个示例代码是我发现的最接近我想要做的事情，但它使用中间文件。 如果可能的话，我宁愿将东西留在流中以避免中间文件的开销。 由于Browserify输出一个流，它似乎应该知道如何接受一个流。 相关代码： var gulp = require('gulp'); var browserify = requ var concat = require('gulp-conca
This question already has an answer here: How do I empty an array in JavaScript? 18 answers user3378165 gave the correct answer: <script> fruitArray = ["apple", "banana", "orange", "pineapple"]; function newFruit(myArray){ myArray.length = 0; } newFruit(fruitArray); alert(fruitArray[0]);//Returns "apple" </script> Actually, the question is by value topic, you can learn more h
这个问题在这里已经有了答案： 如何在JavaScript中清空数组？ 18个答案 user3378165给出了正确的答案： <script> fruitArray = ["apple", "banana", "orange", "pineapple"]; function newFruit(myArray){ myArray.length = 0; } newFruit(fruitArray); alert(fruitArray[0]);//Returns "apple" </script> 实际上，问题在于by value主题，您可以在这里了解更多信息： 实际上，这意味着如果您自己更改参数（