下拉按钮样式，参考

setTimeout(function() {

$('.fr-trigger-texteditor').css({"background-color": "#0602f2"}).css("border", "1px solid #0602f2");//背景

$('.fr-trigger-text.fr-border-box').css("border", "1px solid #0602f2");//边框

$(".fr-trigger-btn-up").css("background", "#0602f2").css("border", "0px solid #0602f2");//下拉按钮背景色

$(".fr-trigger-editor").css("border-radius","10px").css("border", "2px solid #ffffff");//圆角

},100);