js代码Uncaught ReferenceError: dataLayer is not defined错误？

Question

网站连一段js分享代码，只要点击分享，浏览器就报Uncaught ReferenceError: dataLayer is not defined at HTMLAnchorElement.onclick错误。

js报错部分代码如下：

<a href="javascript:;" data-action="ding" data-id="2597" class="favorite"><i class="icon"></i><span class="count">2</span></a></span><a rel="nofollow" class="share button\_share" href="javascript:void(0);" onclick="dataLayer.push({'event':'WAP优惠详情\_分享'})"><i class="icon"></i><em>分享</em></a><a class="comments" id="js-foot-comments" onclick="dataLayer.push({'event':'WAP优惠详情\_评论'})"><i class="icon"></i><em> 1</em></a><a class="next" href="[https://www.gouwomei.com](https://www.gouwomei.com/)" title="首页瞧瞧"><s></s>首页瞧瞧</a></div><div id="share\_block"><div id="share\_cover"></div><div class="share-block"><a rel="nofollow" href="[http://v.t.sina.com.cn&url=https://www.abc.com&pic=https://www.abc.com/img/2020AprSun7771-500x500.jpg](http://v.t.sina.com.cn%26url%3Dhttps//www.abc.com&pic=https://www.abc.com/img/2020AprSun7771-500x500.jpg)">

请问该怎么修改？

Answer 1

该加载的 js 没有加载。好好看看文档。