css修改控件样式：https://help.fanruan.com/finereport10.0/doc-view-1367.html?source=4

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');

//设置下拉、下拉复选、日期控件圆角

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

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

//设置下拉框与下拉复选框下拉三角的颜色

$('.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');

//将方块分为四个三角，上面的三角设置显示色

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

//其他三个三角设置与背景色相同

$('.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)

效果图：具体颜色自己修改