<div class="container">
<button type="button" class="btn" onclick="insertContentAtCursor('[login]请在此输入登录可见内容[/login]\\\\n')">插入登录可见内容</button>
<textarea id="message" placeholder="在这里输入内容..." ></textarea>
</div>
<script>
function insertContentAtCursor(content) {
var textArea = document.getElementById('message');
var caretPos = textArea.selectionStart;
textArea.value = textArea.value.substring(0, caretPos) + content + textArea.value.substring(caretPos);
textArea.setSelectionRange(caretPos + content.length, caretPos + content.length);
}
</script>