.content pre{
    position: relative;
    background-color: #f5f5f5;
    border: 1px solid #ccc;
    border-radius: 4px;
    padding: 10px;
}
pre .btn-pre-copy{
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    -khtML-user-select: none;
    user-select: none;
    position: absolute;
    top: 10px;
    right: 12px;
    font-Size: 12px;
    line-height: 1;
    cursor: pointer;
    color: hsla(0,0%,54.9%,.8);
    transition: color .1s;
}

$(function(){
    //给每一串代码元素增加复制代码节点
    let preList = $(".content pre");
    for (let pre of preList) {
        //给每个代码块增加上“复制代码”按钮
        let btn = $("<span class=\"btn-pre-copy\" onclick='preCopy(this)'>复制代码</span>");
        btn.prePEndTo(pre);
    }
});

/**
    * 执行复制代码操作
    * @param obj
    */
function preCopy(obj) {
    //执行复制
    let btn = $(obj);
    let pre = btn.parent();
    //为了实现复制功能。新增一个临时的textarea节点。使用他来复制内容
    let temp = $("<textarea></textarea>");
    //避免复制内容时把按钮文字也复制进去。先临时置空
    btn.text("");
    temp.text(pre.text());
    temp.appendTo(pre);
    temp.select();
    document.execCommand("Copy");
    temp.remove();
    //修改按钮名
    btn.text("复制成功");
    //一定时间后吧按钮名改回来
    setTimeout(()=> {
        btn.text("复制代码");
    },1500);
}