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js动态向 head 标签中引入js文件

function dynamicLoadJs(url, callback) {
       var head = document.getElementsByTagName('head')[0];    var script = document.createElement('script');    script.type = 'text/javascript';    script.src = url;    if (typeof (callback) == 'function') {
           script.onload = script.onreadystatechange = function () {
               if (!this.readyState || this.readyState === "loaded" || this.readyState === "complete") {
                   callback();                script.onload = script.onreadystatechange = null;            }        };    }    head.appendChild(script);}//引入的js文件地址let url='https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.js'dynamicLoadJs(url);

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