The difference between ff and ie on javascript and css

With the continuous development of the Internet, web development has become an indispensable part of people's lives. JavaScript and CSS languages ​​used in web development are also becoming increasingly important. For different browsers, there are some differences in their interpretation and implementation of JavaScript and CSS. This article will focus on the differences between JavaScript and CSS between FF and IE.

1. The difference between JavaScript

1. Event handler

There are some differences between the event handler of FF and IE. FF does not support overriding event handlers on an element in a specific way. IE can override the original event handler by using the "AttachEvent" method of the DOM element.

2. Access to object properties

In JavaScript, the properties of an object can be accessed in two ways: directly referencing the object properties and using the square bracket operator. However, in IE browser, when the name of the object attribute is the same as the name of an existing global variable, problems will occur when accessing by directly referencing the object attribute.

3. Operator order

There are also differences in how FF and IE handle JavaScript operator order. In JavaScript, the order of operators determines the order in which statements are executed. In IE browser, the handling of operator priority will be different from other browsers.

4. The enumeration order of object properties

In JavaScript, the enumeration order of object properties is undefined. But in IE browser, the properties of the object will be enumerated in a specific order.

2. The difference between CSS

1. Box model

In CSS, the box model is a very important concept. But there are differences in the implementation of the box model in FF and IE. In FF, the box model will adopt the "standard model" by default, that is, the width and height of the element do not include borders and padding. In IE, the "traditional model" is adopted by default, that is, the width and height of the element include borders and padding.

2. CSS selectors

In CSS, selectors are widely used. However, there are differences in the support for some selectors in FF and IE. For example, FF supports attribute selectors in CSS3, which requires JavaScript to be implemented in IE.

3. How to interpret CSS

There are also differences in how FF and IE interpret CSS. In FF, the CSS interpretation process is very strict and there is no fault tolerance for any errors. In IE, there will be some fault-tolerance mechanisms that can allow some incorrect CSS syntax to pass.

4. Caching of style sheets

When the CSS style sheet file is requested, the browser will cache it to improve the page loading speed. However, there are also differences in the processing of cache in FF and IE. In FF, if the URL of the style sheet changes, the browser clears the cache and reloads it. In IE, if the URL of the style sheet has not changed, even if the style sheet itself has changed, the browser will use the old style sheet in the cache for interpretation.

To sum up, with the continuous development of the Internet, web development is becoming more and more important. It is also necessary to understand the differences between JavaScript and CSS in different browsers. Therefore, when designing web pages, we also need to consider the compatibility issues of different browsers.

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