The editor below will share with you an article summarizing some compatibility and error-prone issues in js. It has a good reference value and I hope it will be helpful to everyone. Let’s follow the editor and take a look.
1. Attribute related
We usually refer to attributes and properties collectively as Attributes, but they are indeed different concepts.
Features (attributes) will appear in HTML text, modifications to attributes will definitely appear in the element's outerHTML, and attributes only exist in element nodes;
Attributes (property) modify JS objects. Except for some built-in features of the browser, other attribute operations will not affect HTML text.
1. IE6/7 does not distinguish between attributes and characteristics
Other browsers will distinguish between attributes and characteristics, but IE67 does not distinguish between them. Under IE67 we only Features can be deleted using attribute names. Although these two names are often the same, there are always differences.
2. IE6/7 cannot use getAttribute/setAttribute to operate features whose values are not strings
In modern browsers, getAttribute will definitely return the corresponding value in HTML String, and the result returned by IE67 is unpredictable, so under IE67, we need to use AttributeNode to operate attributes.
3. IE6/7/8 cannot obtain CSS text through the style attribute
This problem should be the sequelae of IE6/7 not distinguishing between attributes and characteristics. When using the style attribute, just use elem.style.cssText.
4. IE6/7 will parse relative URLs into absolute URLs
This problem even causes the empty src attribute under IE6/7 to generate repeated requests. You can Use getAttribute('href/src', 4).
5. The default behavior of element characteristics is different
There will be many bugs of this type. For example, in some old webkit browsers, the default behavior of checkbox/radio The value is "", not on. In some older webkit browsers the first element of the select will not be selected.
2. Style operations
Normally, styles include getting and setting inline styles and getting the calculated styles of elements
1. IE supports background-position-x/y but other browsers do not.
background-position-x/y can be used to conveniently gradient the position of an image. If it is not supported, we can consider using the parsing background-position attribute to handle it.
2. IE6/7 does not support the opacity attribute
You can achieve the same effect through the alpha filter, but remember to trigger the haslayout of the element.
3. IE6/7/8 will mistakenly let the nodes generated by clone inherit some attributes
For example, background, if you modify one or two, they will be changed at the same time.
4. Different ways to get the calculated style
IE6/7/8 uses elem.currentStyle while other browsers use the window.getComputedStyle function.
5. Different pixelation methods
Pixelization refers to converting distances whose units are not pixels into pixels to facilitate calculations. Strictly speaking this is not a compatibility issue, but it may be used across the board. In IE6/7/8, we can use elem.runtimeStyle with pixelLeft for processing.
Modern browsers can use the width attribute.
6. Some BUG behaviors when obtaining CSS
In the Webkti core browser, margin-right often goes wrong.
3. Query operation
Query passing refers to finding a set of elements through some characteristic strings, or judging whether the elements satisfy string.
1. IE6/7 does not distinguish between id and name
When using getElementById and getElementsByName under IE6/7, it will return the same id or name as the given value at the same time. element. Since the name is usually agreed upon by the backend, when we write JS, we should ensure that the id does not duplicate the name.
2. IE6/7 does not support getElementsByClassName and querySelectorAll
These two functions are supported from IE8, so under IE6/7, we can actually use them Only getElementByTagName.
3. IE6/7 does not support getElementsByTagName('*') and will return non-element nodes
Either do not use *, or write a function to filter it yourself.
4. querySelectorAll under IE8 is not friendly to attribute selectors
Almost all browser predefined attributes have problems. Try to use custom attributes or no attributes. Selector.
5. querySelectorAll does not support pseudo-classes under IE8
Sometimes pseudo-classes are very useful, but IE8 does not support them. jquery provides :first, :last, :even, :odd, :eq, :nth, :lt, :gt are not pseudo-classes, and we should not use them at any time.
6. The matches function of IE9 cannot handle elements that are not on the DOM tree
As long as the element is not on the DOM tree, it will definitely return false. It is really impossible to throw the element in Delete it after matching in the body. Of course, we can also write our own matching function to avoid backflow.
4. Event operations
Usually when people ask about the compatibility of JS, the first reaction will be attachEvent and addEventListener, but there are still many details about the difference between these two functions.
1. Event action objects are different
addEventListener is the current object to which the event bubbles up, while attachEvent is window.
. Event parameter objects are different
Be sure to note that the function bound to attachEvent has parameter e. Do not write e = e || event, but there are many parameter attributes of the two. Differences, such as button or witch, whether pageY is supported or not, etc.
2. The evil wheel event
The support for wheel events is a mess, the rules are as follows:
IE6-11 chrome mousewheel wheelDetla down-120 up 120
firefox DOMMouseScroll detail next 3 upper-3
firefox wheel detlaY next 3 upper-3
IE9-11 wheel deltaY next 40 upper-40
chrome wheel deltaY Next 100 Up -100
3. Three major non-bubbling events
The focus/blur events of all browsers do not bubble. Fortunately, most of them do not bubble. Some browsers support focusin/focusout events, but the damn Firefox doesn't even support this.
The submit event does not bubble under IE678.
Under IE678, the change event will not be triggered until blur.
We have no effective means to solve these three problems and can only deal with them through simulation triggering.
4. a.click()
This method is unsafe in many browsers. Once executed, even if the default behavior is blocked, the page will still jump. .
5. Node operation
Node operation usually refers to copying, generating a node or moving the location of a node.
1.. innerHTML
When using innerHTML in IE6/7/8, there must be a text node in front, otherwise many tags will be lost. In addition, in many cases, using innerHTML will cause errors in the defaultValue attribute.
2. Useless tbody
IE6/7/8 will automatically add an empty tbody to an empty table
3. When cloningNode, the attachEvent event
will be copied and unless we record the events we bound, we cannot unbind them.
The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.
Related articles:
How to build a tree menu through recursive components in Vue.js
How to achieve extremely fast zero-configuration packaging in Parcel.js Vue 2.x
The problem that beforeRouteLeave cannot be triggered when the browser goes back when using Vue
How to solve the problem of tap "click through" in fastclick code
The above is the detailed content of Compatibility and error-prone issues that easily occur in js. For more information, please follow other related articles on the PHP Chinese website!

如何使用JS和百度地图实现地图平移功能百度地图是一款广泛使用的地图服务平台,在Web开发中经常用于展示地理信息、定位等功能。本文将介绍如何使用JS和百度地图API实现地图平移功能,并提供具体的代码示例。一、准备工作使用百度地图API前,首先需要在百度地图开放平台(http://lbsyun.baidu.com/)上申请一个开发者账号,并创建一个应用。创建完成

如何使用JS和百度地图实现地图多边形绘制功能在现代网页开发中,地图应用已经成为常见的功能之一。而地图上绘制多边形,可以帮助我们将特定区域进行标记,方便用户进行查看和分析。本文将介绍如何使用JS和百度地图API实现地图多边形绘制功能,并提供具体的代码示例。首先,我们需要引入百度地图API。可以利用以下代码在HTML文件中导入百度地图API的JavaScript

js字符串转数组的方法:1、使用“split()”方法,可以根据指定的分隔符将字符串分割成数组元素;2、使用“Array.from()”方法,可以将可迭代对象或类数组对象转换成真正的数组;3、使用for循环遍历,将每个字符依次添加到数组中;4、使用“Array.split()”方法,通过调用“Array.prototype.forEach()”将一个字符串拆分成数组的快捷方式。

如何使用JS和百度地图实现地图热力图功能简介:随着互联网和移动设备的迅速发展,地图成为了一种普遍的应用场景。而热力图作为一种可视化的展示方式,能够帮助我们更直观地了解数据的分布情况。本文将介绍如何使用JS和百度地图API来实现地图热力图的功能,并提供具体的代码示例。准备工作:在开始之前,你需要准备以下事项:一个百度开发者账号,并创建一个应用,获取到相应的AP

js中new操作符做了:1、创建一个空对象,这个新对象将成为函数的实例;2、将新对象的原型链接到构造函数的原型对象,这样新对象就可以访问构造函数原型对象中定义的属性和方法;3、将构造函数的作用域赋给新对象,这样新对象就可以通过this关键字来引用构造函数中的属性和方法;4、执行构造函数中的代码,构造函数中的代码将用于初始化新对象的属性和方法;5、如果构造函数中没有返回等等。

这篇文章主要为大家详细介绍了js实现打字小游戏,文中示例代码介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们可以参考一下。

php在特定情况下可以读js内部的数组。其方法是:1、在JavaScript中,创建一个包含需要传递给PHP的数组的变量;2、使用Ajax技术将该数组发送给PHP脚本。可以使用原生的JavaScript代码或者使用基于Ajax的JavaScript库如jQuery等;3、在PHP脚本中,接收传递过来的数组数据,并进行相应的处理即可。

js全称JavaScript,是一种具有函数优先的轻量级,直译式、解释型或即时编译型的高级编程语言,是一种属于网络的高级脚本语言;JavaScript基于原型编程、多范式的动态脚本语言,并且支持面向对象、命令式和声明式,如函数式编程。


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

SublimeText3 Mac version
God-level code editing software (SublimeText3)

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

Notepad++7.3.1
Easy-to-use and free code editor

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.
