{Code...} Find the correct way to write, initialize and update data methods

Before I started learning es6, a click event was rewritten as $(".btn").click(()=>{console.log(this)}); where this points to the document, but if you use function, this points to It is the current element. How to change the point of this?

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How to quickly debug the local PC mobile page on the mobile phone? It seems that I can only view online pages using Google Chrome Dev Tools, but cannot access them locally on my PC.

If you define a function that changes the style attribute of an element using a function declaration, an error will be reported, but no error will be reported under window.onload.

Now there is a requirement. When I share on the home page, the title is aaaa. When I share on the details page, the title is bbb. But the copy is fixed as soon as the page is loaded. How do I dynamically change the shared copy? I use vue2 code. As follows, I write it in main.js and load it as soon as it is executed...

{code...} Replace the content in the tag with {code...} How to write the regular expression?

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How to optimize this code? The boss said that it should be converted into ES6 map data structure. I may have done it wrong and it seems to be slower. This is the optimization I did. It seems to be slower. Please give me some advice.

General carousels are known to be implemented by changing the left of the image's parent container, but what about the principle of carousels that are connected end to end? How to control JS?