How to dynamically load js through JavaScript

During Web development, we may encounter the following situation: we need to reference another j through a js file.

During Web development, you may encounter this situation: we need to reference functions in another js file through one js file, however, is there a way for another function to load data through the script tag on the page. Therefore, we have the need to dynamically load js files through js. The following provides a solution.

The method is relatively simple. For details about the instance, see the code:

File 1: demo. js

function demo(){alert("demo");}

File 2: test. js

function test(){alert("test");} function loadDemo(){var iHead = document.getElementsByTagName('HEAD').item(0);   var iScript= document.createElement("script");   iScript.type = "text/javascript";   iScript.src="demo.js";   iHead.appendChild(iScript);  }

File 3: test.html

 Insert title here