尝试这样的事情:
let text = ''
document.querySelector("input").addEventListener("input", () => {
text = document.querySelector("input").value;
let full_name = text.split(" ");
let initials = full_name[0][0];
if (text) {
if (full_name.length >= 2 && full_name[1]) {
initials += full_name[1][0];
}
} else {
initials = '';
}
document.querySelector("div").innerHTML = initials;
});
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div>
</div>
<input type="text">
</body>
</html>
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我来说两句