js development to dynamically modify web page element styles

This article mainly talks about code examples for modifying web page element styles with JS. It has certain reference value. Friends who are interested can learn about it. I hope it will be helpful to you after reading it.

In front-end development, sometimes the styles of web page elements need to be dynamically modified. Here is a summary of the method of dynamically modifying element styles using JS.

Webpage structure:

Button:

Label: input Type: button id: btn Value: click me

p:

Tag: p id: box

There are two ways to use JS to modify the style of web page elements:

1. Use ClassName

2. Use Style object

The code is as follows:

Related tutorials: HTML video tutorial

Note:

1. When operating styles, use example style ClassName or Style Object? ?

When setting multiple style attributes, it is convenient to use class styles

When setting fewer style attributes, it is more convenient to use Style objects

2. When using Style objects When encountering the width and height attributes, you must add the px unit

3. The value of the Style object attribute style is a string

The result is as shown in the figure:

Related tutorials: js video tutorial

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