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How to set background color in javascript

青灯夜游Original: 2021-07-20 14:57:4024845browse

In javascript, you can use the backgroundColor property of the Style object to set the background color. This property is used to set the background color of the element. The syntax format is "element object.style.backgroundColor="color value";".

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

How to set the background color in javascript

In javascript, you can use the backgroundColor property of the Style object to set the background color.

Grammar:

Object.style.backgroundColor="颜色值"

Example:

<!DOCTYPE html>
<html>
	<head>
		<style type="text/css">
			body {
				background-color: #B8BFD8;
			}
		</style>
		<script type="text/javascript">
			function changeStyle() {
				document.body.style.backgroundColor = "#FFCC80";
				// document.body.style.backgroundColor="red";
			}
		</script>
	</head>
	<body>

		<input type="button" onclick="changeStyle()" value="改变背景颜色" />

	</body>
</html>

Rendering:

How to set background color in javascript

Instructions: How to write color values:

1. Use color names

standard and recommended color names

/*名 称	颜 色	名 称	颜 色	名 称	颜 色
black	纯黑	silver	浅灰	navy	深蓝
blue	浅蓝	green	深绿	lime	浅绿
teal	靛青	aqua	天蓝	maroon	深红
red	大红	purple	深紫	fuchsia	品红
olive	褐黄	yellow	明黄	gray	深灰
white	壳白*/

It is not recommended to use color names in web pages, especially large-scale use, to avoid some color names not being parsed by browsers, or different browsers interpreting colors differently.

2. Hexadecimal color

Hexadecimal symbols #RRGGBB and #RGB (such as #ff0000). "#" followed by 6 or 3 hexadecimal characters (0-9, A-F).

This is the most commonly used color selection method, for example:

#f03
#F03
#ff0033
#FF0033

3, RGB, red-green-blue (RGB)

The color value is specified as the color of the rgb code. The function format is rgb(R,G,B), and the value can be an integer or percentage from 0-255.

rgb(255,0,51)
rgb(255, 0, 51)
rgb(100%,0%,20%)
rgb(100%, 0%, 20%)

Extensions: RGBA, Red-Green-Blue-Alpha (RGBa)

RGBA extends the RGB color mode to include an alpha channel, allowing the transparency of a color to be set. a represents transparency: 0=transparent; 1=opaque.

rgba(255,0,0,0.1)    /* 10% 不透明 */  
rgba(255,0,0,0.4)    /* 40% 不透明 */  
rgba(255,0,0,0.7)    /* 70% 不透明 */  
rgba(255,0,0,  1)    /* 不透明，即红色 */

4. HSL, hue-saturation-lightness (Hue-saturation-lightness)

Hue (Hue) represents the color circle (that is, a circle representing a rainbow) ring) at an angle.
Saturation and brightness are expressed as percentages.
100% is full saturation, while 0% is a grayscale.
100% lightness is white, 0% lightness is black, and 50% lightness is "normal".

hsl(120,100%,25%)    /* 深绿色 */  
hsl(120,100%,50%)    /* 绿色 */       
hsl(120,100%,75%)    /* 浅绿色 */

Extension: HSLA, Hue-Saturation-Lightness-Alpha (HSLa)

HSLa extends from the HSL color mode and includes the alpha channel, which can specify the transparency of a color. a represents transparency: 0=transparent; 1=opaque.

hsla(240,100%,50%,0.05)   /* 5% 不透明 */   
hsla(240,100%,50%, 0.4)   /* 40% 不透明 */  
hsla(240,100%,50%, 0.7)   /* 70% 不透明 */  
hsla(240,100%,50%,   1)   /* 完全不透明 */

5, transparent

Special color value, indicating transparent color. Can be used directly as color.

[Recommended learning: javascript advanced tutorial]

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