<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<input placeholder="输入一些文本" type="text">
<script>
var inputText=document.querySelector("input");
inputText.addEventListener("keyup",function(e){
if(e.keyCode==13){
alert(1)
}
})
</script>
</body>
</html>
原文：https://www.cnblogs.com/zimengxiyu/p/10782398.html