<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>js实现复制文本到剪切板</title>
</head>
<body>
    <textarea cols="50" rows="2" id="richard">祝大家17年一切顺利</textarea>
    <input onclick="copyText()" type="button" value="复制"/>
    <script>
        function copyText() {
            var copyText=document.getElementById("richard");
            copyText.select();
            document.execCommand("copy");//执行浏览器复制命令
            alert("复制成功！");
        }
    </script>
</body>
</html>

实例如下：