效果图

实现过程

CSS代码如下

#tag_cloud-2>div>a {
    color: #fff;
    text-align: center;
    text-overflow: ellipsis;
    white-space: nowrap;
    padding: 3px 5px;
    border: 0;
    border-radius: 3px;
    display: inline-block;
    line-height: 18px;
}

#tag_cloud-2>div>a:hover {
    background: #d02f53;
}

JS代码如下

function colorfultags(){
let tags = document.querySelectorAll("#tag_cloud-2 a");
let colorArr = ["#f60", "#45B6F7", "#15a287", "#5cb85c", "#d9534f", "#567e95", "#00a67c", "#b37333"];
let count = 1;
tags.forEach(tag => {
    tagsColor = colorArr[count%8];
    tag.style.backgroundColor = tagsColor;
    count++;
});
}
window.onload=colorfultags();

PJAX回调如下

colorfultags();