mix-blend-mode:设为difference即可，看看效果：
代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
<title>BFW NEW PAGE</title>
<style>
body{
padding: 0;
margin: 0;
}
.banner{
background: url("//repo.bfw.wiki/bfwrepo/image/65422df611d69.png");
background-repeat: no-repeat;
background-size: cover;
height: 100vh;
}
.title {
font-size:100px;
text-align: center;
line-height: 100vh;
color:white;
margin: 0 auto;
mix-blend-mode: difference;
}
</style>
</head>
<body>
<div class="banner">
<h1 class="title">我是标题</h1>
</div>
</body>
</html>
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