I've been trying to understand how this value is set in javascript, and found ECMAScript Language Specification pretty much helpful. I was reading section 8.7 reference specification type and found that reference in ECMAScript is made of 3 component, base value , referenced name , strict reference flag to understand section 11.2.3. I can assume what are referenced name and strict reference
我一直在试着理解如何在javascript中设置this值，并发现ECMAScript语言规范非常有用。 我正在阅读第8.7节reference specification type ，发现ECMAScript中的引用由3个分量， base value ， referenced name ， strict reference flag以了解第11.2.3节。 我可以假设他们的referenced name中referenced name和strict reference flag是什么，但我不明白base value是什么。 该文件说base value是undefined ， String ， Boolean
I have a URL with some GET parameters as follows: www.test.com/t.html?a=1&b=3&c=m2-m3-m4-m5 I need to get the whole value of c . I tried to read the URL, but I got only m2 . How do I do this using JavaScript? JavaScript itself has nothing built in for handling query string parameters. In a (modern) browser you can use the URL object; var url_string = "http://www.example.com/t.ht
我有一个带有一些GET参数的URL，如下所示： www.test.com/t.html?a=1&b=3&c=m2-m3-m4-m5 我需要得到c的全部价值。 我试图读取URL，但我只有m2 。 我如何使用JavaScript来做到这一点？ JavaScript本身没有内置的用于处理查询字符串参数。 在（现代）浏览器中，您可以使用URL对象; var url_string = "http://www.example.com/t.html?a=1&b=3&c=m2-m3-m4-m5"; //window.location.href var url = new URL(
I've come across some code that has this sort of pattern in numerous places: this.someFunction.call(this, param); but it seems to me just a more verbose way of typing this.someFunction(param) The pattern sometimes appears inside a function which is provided as a callback. It happens to use Backbone, in case that's relevant. Something like this: Backbone.View.extend({ // other s
我遇到了一些在许多地方都有这种模式的代码： this.someFunction.call(this, param); 但在我看来，只是一种更详细的打字方式 this.someFunction(param) 该模式有时出现在作为回调提供的函数内部。 它恰好使用Backbone，以防相关。 像这样的东西： Backbone.View.extend({ // other stuff ... someFunction: function(param) { // ... }, anotherFunction: function() { this.collection.
This question already has an answer here: Change an element's class with JavaScript 30 answers You're getting an error because a space is not a valid character in a class name. Instead pass individual strings, and receive them as a rest parameter. Then you can use spread syntax to pass the list of classes to classList.add() . // Receive all the classes--------v function Img(im
这个问题在这里已经有了答案： 使用JavaScript 30个答案更改元素的类 您遇到错误是因为空间不是类名称中的有效字符。 而是传递单个字符串，并将它们作为一个静态参数接收。 然后，您可以使用扩展语法将类列表传递给classList.add() 。 // Receive all the classes--------v function Img(imgId, imgSrc, ...imgClass) { this.imgId = imgId || ''; this.imgSrc = imgSrc || ''; this.imgClass = imgClass;
This question already has an answer here: Change an element's class with JavaScript 30 answers 这将一个添加selected类的点击th元素，它会删除所述selected从先前点击类th ： document.querySelector('thead').addEventListener('click', function(e) { var current; if (e.target.tagName === 'TH') { current = document.querySelector('th.selected'); if (current) { current.classList.
这个问题在这里已经有了答案： 使用JavaScript 30个答案更改元素的类 这将一个添加selected类的点击th元素，它会删除所述selected从先前点击类th ： document.querySelector('thead').addEventListener('click', function(e) { var current; if (e.target.tagName === 'TH') { current = document.querySelector('th.selected'); if (current) { current.classList.remove('selected'); } e.
This question already has an answer here: Change an element's class with JavaScript 30 answers It might be wise to consider an alternative to using the onclick attribute due to separation of concerns. The following allows you to alter the HTML without having to consider JavaScript while you work. https://jsfiddle.net/gseh0wxc/2/ var getList = (selector) => [].slice.call(document.qu
这个问题在这里已经有了答案： 使用JavaScript 30个答案更改元素的类 由于关注的分离，考虑使用onclick属性的替代方案可能是明智的。 以下内容允许您在工作时不必考虑JavaScript而改变HTML。 https://jsfiddle.net/gseh0wxc/2/ var getList = (selector) => [].slice.call(document.querySelectorAll(selector)); var paragraphs = getList("#divid p[id ^= 'p']"); paragraphs.forEach((paragraph, index) => {
Possible Duplicate: Change an element's CSS class with JavaScript How can I change the class of <input type="submit:> not using the id, just the class in Javascript. I have have tried this (with no luck): function changeClass(){ document.getElementById("wpsc_buy_button").setAttribute("class", "btn btn-success"); } $('.originalClass').addClass('newClass')
可能重复： 使用JavaScript更改元素的CSS类 我怎样才能改变<input type="submit:>的类，而不是使用id，只是Javascript中的类。我已经试过了（没有运气）： function changeClass(){ document.getElementById("wpsc_buy_button").setAttribute("class", "btn btn-success"); } $（”。originalClass '）。addClass（' 的NewClass'） 为什么这不起作用？ 你也可以做 $（”。originalClass &#
This question already has an answer here: Change an element's class with JavaScript 30 answers Class should be className : ul.className="nav nav-pills nav-stacked"; ...because JavaScript is case-sensitive, so Class and class aren't the same thing, and because when the DOM bindings for JavaScript were being created, they couldn't use class because at that time, in JavaScript, you
这个问题在这里已经有了答案： 使用JavaScript 30个答案更改元素的类 Class应该是className ： ul.className="nav nav-pills nav-stacked"; ...因为JavaScript是区分大小写的，所以Class和class不是一回事，因为当创建JavaScript的DOM绑定时，它们不能使用class因为那时在JavaScript中， t写ul.class = ...因为class是一个保留字，你不能在这样的属性文字中使用它。 （你现在可以，从2009年的ES5开始，但当然这是绑定创建
This question already has an answer here: Change an element's class with JavaScript 30 answers To use a javascript variable as an HTML value, you have to set it in javascript. So to set your value attribute, do it like this: And you need to wrap the code in the function that you set in the onClick <script> function addObject(){ var colorArray = ['.st1', '.st2', '.st
这个问题在这里已经有了答案： 使用JavaScript 30个答案更改元素的类 要将JavaScript变量用作HTML值，您必须将其设置为javascript。 因此，要设置您的value属性，请这样做：并且您需要将代码包装在您在onClick设置的函数中 <script> function addObject(){ var colorArray = ['.st1', '.st2', '.st3', '.st4']; var randomColor = Math.floor(Math.random() * colorArray.length); co
Possible Duplicate: Change an element's CSS class with JavaScript Found lot of topics about this topic, but none helped me. I have: <div id="text-6" class="block col-228"> Javascript code should add new class fit, so result should be: <div id="text-6" class="block col-228 fit"> How to do that with javascript? Try like this: var elem = document.getElementById("text-6");
可能重复： 使用JavaScript更改元素的CSS类 发现了很多关于这个话题的话题，但没有人帮助我。 我有： <div id="text-6" class="block col-228"> Javascript代码应该添加新的类适合，所以结果应该是： <div id="text-6" class="block col-228 fit"> 如何用JavaScript做到这一点？ 像这样尝试： var elem = document.getElementById("text-6"); elem.setAttribute("class", elem.getAttribute("class")+" f