<!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>
<style>
.editable{
200px;
height: 200px;
border: 1px solid #000;
}
</style>
</head>
<body>
<div class="editable" id="richedit" contenteditable="true"></div>
<input type="button" id="btn1" value="变红">
<input type="button" id="btn2" value="变粗">
<script>
var btn1 = document.getElementById("btn1");
var btn2 = document.getElementById("btn2");
btn1.onclick = function(){
document.execCommand("forecolor",false,"#ff0000");
}
btn2.onclick = function(){
document.execCommand("bold",false,null);
}
</script>
</body>
</html>
效果：
还可以继续编写其他富文本功能，方法类似
