这个可以的呀

setInterval(function() {

$('.fr-trigger-texteditor').css('border', 'none');

$('.fr-trigger-text').css('border', 'none');

$('.fr-trigger-text').css('border-left', '1px solid #9E9E9E');

$('.fr-trigger-text').css('border-top', '1px solid #9E9E9E');

$('.fr-trigger-text').css('border-bottom', '1px solid #9E9E9E');

$('.fr-trigger-btn-up').css('border-top', '1px solid #9E9E9E');

$('.fr-trigger-btn-up').css('border-bottom', '1px solid #9E9E9E');

$('.fr-trigger-btn-up').css('border-right', '1px solid #9E9E9E');

$('.fr-trigger-texteditor').css('background', '#F2F2F2');

$('.fr-trigger-btn-up').css('background', '#F2F2F2');

$('.fr-trigger-text').css('background', '#F2F2F2');

$('.fr-trigger-text').css('border-radius', '8px 0 0 8px');

$('.fr-trigger-btn-up').css('border-radius', '0 8px 8px 0');

$('.fr-trigger-center').css('width', '0px');

$('.fr-trigger-center').css('height', '0px');

$('.fr-trigger-center').css('margin', '0 2 0 0');

$('.fr-trigger-center').css('background', '#F2F2F2');

$('.fr-trigger-center').css('border-top', '6px solid #1AB436');

$('.fr-trigger-center').css('border-left', '6px solid #F2F2F2');

$('.fr-trigger-center').css('border-bottom', '6px solid #F2F2F2');

$('.fr-trigger-center').css('border-right', '6px solid #F2F2F2');

}, 50)

白色的倒三角F12查看是一张图片，单纯改颜色可能改不了，可以替换背景图片试试

参考

--https://bbs.fanruan.com/wenda/question/72802.html