Summary of basic js usage

This time I will bring you a summary of the basic use of js. What are the precautions for the basic use of js. The following is a practical case, let’s take a look.

0/0 ==> NaN(Not a Number)
You can use isNaN() to detect whether the value is NaN

Escape character

' single Quotation marks
\n Carriage return and line feed
\r Line feed
\t Horizontal tab character

Variable parameters

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The use of Polyfill annotations and preventing modifications in JS

JS object inheritanceUse cases Detailed explanation

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