利用JQ 中的 placeholderTypewriter 插件
<script src="https://lib.baomitu.com/jquery/3.5.1/jquery.min.js"></script>//引入JQ
<script src="https://www.51macc.com/js/placeholderTypewriter.js"></script>//引入placeholderTypewriter插件
<body>
<input type="text" id="in" placeholder="nihao" name="" id="">
</body>
<script>
var placeholderText = [
"动起来",
"奥利给",
"动次打次",
];
$('#in').placeholderTypewriter({text: placeholderText})
<script>
IMG_3110.GIF
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