JavaScript solves problems that browsers don't support _javascript tips

For the readability of the program/code, basically every programming language has the function of annotation, JavaScript is no exception, JavaScript annotation code has many forms, this article introduces you to the JavaScript annotation code two methods,

JavaScript annotation code generally has two methods:

Single-line Comment
Multiline Comment

JavaScript single-line Comment

A single-line comment begins with "//" and ends at the end of the row. The following is a JavaScript single-line annotation instance:

JavaScript Multiline Comment

Multiline comment begins with///ends with/*. The following example uses multiline annotations to interpret the code:

How to troubleshoot browsers that do not support JavaScript

Apply the annotation symbol to verify that the browser supports JavaScript scripting functionality.

If the user is unsure whether the browser supports JavaScript scripting, you can validate it by applying the annotation notation provided by the HTML. The HTML annotation symbol ends with "<--" starting with "-->". If you write JavaScript scripts within this annotation symbol, the JavaScript script will be processed as annotations for browsers that do not support JavaScript.

Use JavaScript script to output a string in the page, write JavaScript script in HTML annotation, if the browser supports JavaScript will output this string, if not supported will not output this string, the code is as follows:

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