References to javascript files should be included in script tags. Use the src attribute of the script tag to specify the path to the external JavaScript file, with the syntax "<script type="text/javascript" src="file path"></script>".
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the operating environment of this tutorial: Windows 10 system, JavaScript version 1.8.5, Dell G3 computer.
Like
CSS files, JavaScript code can be stored in a separate file to enhance the reproducibility of JavaScript scripts. A JavaScript file is a text file that can be opened and edited in any text editor. The extension of a JavaScript file is js.
The <script> tag is used to define client-side scripts, such as JavaScript.
The <script> element can either contain script statements or point to an external script file through the "src" attribute.
When introducing a JavaScript file, you can use the <script> tag to specify the URL (Uniform Resource Locator) of the JavaScript file through the src attribute of the tag.
Example:
Create a new text file, save it as test.js, write a public function in the file, the function is to return the length of the string
//Public function: Calculate the actual length of the string function strlen(str){
var len;//Declare a temporary variable to store the actual length of the string var i;//Declare the loop variable len = 0;//Initialize the temporary variable len to 0
for(i = 0; i < str.length; i++){//Loop to detect each character in the string if(str.charCodeAt(i) > 255)//If the current character is a double-byte character, +2
len += 2;
else //If the current character is a single-byte character, +1
len++;
}
return len;//Return the actual length value} Create a new HTML document and introduce test.js.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<!--Introducing external JavaScript files-->
<script type="text/javascript" src="test.js" ></script>
</head>
<script>
var str = "JavaScript programming language";
document.write("<h2>" + str + "</h2>");//The value of the output variable document.write("<p>Actual length=" + strlen(str) + "bytes</p >");//Call function</script>
<body>
</body>
</html> 
Using external JavaScript files can enhance JavaScript modular development programs and improve code reuse. In web development, users should develop a good habit of code reuse. When writing JavaScript code, use more external JavaScript files, which can improve the speed and efficiency of project development.
Related recommendations: JavaScript learning tutorial.
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