查漏补缺

1. 字符串总加空格

var a = 'something' + '\xa0\xa0\xa0\xa0\xa0\xa0\xa0' + 'something';

2. 透明的颜色 加 箭头效果

&::after {
    content: '';
    position: absolute;
    top: 40px;
    left: 50%;
    margin-left: -20px;
    border-top: 20px solid #fff;
    border-right: 20px solid transparent;
    border-bottom: 20px solid transparent;
    border-left: 20px solid transparent;
}