How To Open Safari Preferences On Iphone

Enable JavaScript in Safari on an iPhone

This guide will step you through the process of getting JavaScript enabled in Safari on an iPhone.

The screenshots are taken with iOS 12, however these instructions are the same for other versions of Safari on iOS.

Tap the "Settings" icon on the home screen

Return to the Home Screen by pressing the round button underneath the screen. You will see the grid of icons. Then, find the "Settings" icon and tap on it.
Scroll the Settings page down and find the "Safari" option

The Settings screen is longer than the actual screen of the iPhone, so to reach the "Safari" section you will need to scroll the screen down a bit by dragging up on the screen with your finger.
Tap the "Safari" menu option
Scroll Safari's options down and find the "Advanced" option

After you tap the Safari option, you'll then see a big list of settings relating to the Safari app. Scroll down to find the Advanced item - which will be right at the bottom of the list.
Tap on the "Advanced" menu item

Tapping this will display advanced settings for Safari.
Slide the JavaScript setting control to the right to enable it

On the Advanced settings for Safari screen, you'll see a few options. Near the middle is the option for enabling or disabling JavaScript for Safari on your iPhone. To enable JavaScript, slide the switch to the right; as shown in the screenshot below:
JavaScript is now enabled

Congratulations, you just enabled JavaScript. Tap here to confirm that JavaScript is now enabled.

How to enable JavaScript

Change your JavaScript settings Read more
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Source: https://www.whatismybrowser.com/guides/how-to-enable-javascript/safari-iphone