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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<p></p>
<script>
var pp = document.querySelector("p");
var str = "这里是想要显示的文字，这里是想要显示的文字这里是想要显示的文字这里是想要显示的文字这里是想要显示的文字"
n = 0;
var timer;
timer = setInterval(function () {
if (n < str.length) {
pp.innerHTML += str.charAt(n);//sunstring(0,n)
n++
} else {
clearInterval(timer);
}
}, 100)
</script>
</body>
</html>
https://blog.csdn.net/datuzidppd5556/article/details/99638105
