仅检测伪元素上的单击事件

My code is:

我的代码是:

p {
    position: relative;
    background-color: blue;
}

p:before {
    content: '';
    position: absolute;
    left:100%;
    width: 10px;
    height: 100%;
    background-color: red;
}
p {
    position: relati