如何使用js在head标签中添加第三方url脚本和链接？

Question

1. one URL with script and other with stylesheet to be added in head tag using javascript?
2. How can I add another third party script tag in head using javascript and display the code present in it after few seconds when page loads completely?

Eg:

        var RequestURL = '';
        function onWindowClosed(obj) {
        /*This is the function where you need to handle callback object based on various codes
          If the event name passed by you is not matched with the returned one then you can call the logout functionality, as there are some error occured inside the WEB.
        */
        console.log("callback event : " + JSON.stringify(obj));
        if (obj.event_name === event_name) {
            /*your event is returned here.*/
            console.log("successfully returned: " + obj.message);
        } 
        else {
            /*handle other event names here. It may be any 
            unknownEvent,init,capture,initiateAndCapture */
            console.log("event not returned");
        }
        }
        var userDetails= JSON.stringify({
            "appId": ",  
            "customerId": "", 
            "user_type" : "", 
            "name" : "", 
            "transaction_date" : "", 
            "city": "" //optional
            // any other parameters on which the response needs to be analyzed should be included here.
        });

        var params= {
            "event_name":"myEvent"
        };
   

Answer 1

You can append elements like scripts or stylesheets using vanilla JavaScript

 var script = document.createElement("script"); script.setAttribute("src", "https://script.example.com/script.js") // Replace with your script link var head = document.querySelector("head") head.appendChild(script)