如何使用CSS设置文本或图像的透明度？下面本篇文章就来给大家介绍一下使用CSS设置文本或图像的透明度的方法，希望对大家有所帮助。
想要使用CSS设置文本或图像的透明度，可以使用opacity属性来设置。opacity属性用于调整文本或图片的透明度；不透明度的值介于0.0到1.0之间，其中低值表示高透明度，高值表示低透明度。不透明度百分比计算为Opacity％=Opacity* 100。
语法：
element {
opacity: value;
// CSS property
}
示例1：设置图像透明
<!DOCTYPE html>
<html>
<head>
<title>Opacity属性</title>
<style>
.forest {
width: 350px;
opacity: 0.5;
}
.opacity {
padding-top:100px;
text-align:center;
}
body {
background:url(wind.jpg) no-repeat;
background-size:cover;
}
</style>
</head>
<body>
<div class = "opacity">
<img class = "forest" src = "1.jpg">
</div>
</body>
</html>
效果图：
示例2：设置文本透明
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Opacity属性</title>
<style>
.geeks {
background: rgb(0, 153, 0);
padding: 15px;
text-align:center;
width:300px;
}
#geek {
padding: 15px;
text-align:center;
width:300px;
}
.rgba1 {
background: rgba(0, 153, 0, 0.1);
}
.rgba2 {
background: rgba(0, 153, 0, 0.5);
}
.rgba3 {
background: rgba(0, 153, 0, 0.8);
}
.rgba4 {
background: rgba(0, 153, 0, 1.0);
}
.g1 {
float:left;
margin-left:50px;
}
.g2 {
margin-top:-40px;
margin-left:50px;
float:left;
}
</style>
</head>
<body>
<div class ="g1">
<p style = "font-size:24px;font-weight:bold;">透明盒子</p>
<div class = "geeks" style="opacity:0.1;"><p>10% opacity</p></div>
<div class = "geeks" style="opacity:0.5;"><p>50% opacity</p></div>
<div class = "geeks" style="opacity:0.8;"><p>80% opacity</p></div>
<div class = "geeks"><p>100% opacity</p></div></div><br><br>
<div class = "g2">
<p style = "font-size:24px;font-weight:bold;">rgba颜色值</p>
<div class="rgba1" id = "geek"><p>10% opacity</p></div>
<div class="rgba2" id = "geek"><p>50% opacity</p></div>
<div class="rgba3" id = "geek"><p>80% opacity</p></div>
<div class="rgba4" id = "geek"><p>100% opacity</p></div>
</div>
</body>
</html>
效果图：
