How to detect iOS 13 on JavaScript?

问题

I use this function to detect iOS

export function isiOS() {
  return navigator.userAgent.match(/ipad|iphone/i);
}

is there any way to make it detected iOS13+? thanks

Why do I need it? usually, iOS safari can't download files therefore to make image downloadable I should render it as

<img src={qrImage} alt="creating qr-key..." />

however on Android/PC and pretty much everywhere else it's possible to do it directly via

<a href={qrImage} download="filename.png">
    <img src={qrImage} alt="qr code" />
</a>

so user just press image and download it. Turned on on iOS13 now second option works while first one doesn't anymore.

回答1:

I would like to advice you against detecting operating system or browser from user agent, since they are susceptible to change more than an API for that does, till a reliable stable standard API lands. I have no idea about when this second part will happen.

However, I can suggest to detect feature instead if in this case it is applicable to you.

You can check if the anchor html element supports download attribute:

"download" in document.createElement("a") // true in supporting browsers false otherwise

That way you can display the appropriate html markup depending on the output for each case. Something like that may help:

function doesAnchorSupportDownload() {
  return "download" in document.createElement("a")
}
// or in a more generalized way:
function doesSupport(element, attribute) {
  return attribute in document.createElement(element)
}

document.addEventListener("DOMContentLoaded", event => {
  if (doesAnchorSupportDownload()) {
    anchor.setAttribute("display", "inline"); // your anchor with download element. originally display was none. can also be set to another value other than none.
  } else {
    image.setAttribute("display", "inline"); // your alone image element.  originally display was none. can also be set to another value other than none.
  }
});

For example, I use following to detect if I am on an ar quick look supporting browser on iOS:

function doesSupportAnchorRelAR() {
  return document.createElement("a").relList.supports("ar");
}

You can also use techniques documented below: http://diveinto.html5doctor.com/detect.html#techniques

回答2:

You can detect iOS 13 on iPhone but in iPad OS 13 navigator.platform comes as MacIntel. So it is not possible to get iPad identified using below code, but it works perfectly on iPhone.

    if (/iP(hone|od|ad)/.test(navigator.platform)) {
        var v = (navigator.appVersion).match(/OS (\d+)_(\d+)_?(\d+)?/);
        var version = [parseInt(v[1], 10), parseInt(v[2], 10), parseInt(v[3] || 0, 10)];
}

When user asks for mobile website using the browser navigator.platform returns as iPad and works perfectly.

回答3:

See this Link .

$(document).ready(function() {
    function iOSversion() {
        if (/iP(hone|od|ad)/.test(navigator.platform)) {
            var v = (navigator.appVersion).match(/OS (\d+)_(\d+)_?(\d+)?/);
            return [parseInt(v[1], 10), parseInt(v[2], 10), parseInt(v[3] || 0, 10)];
        }
    }

    ver = iOSversion();

    if (ver[0] >= 13) {
        alert('This is running iOS '+ver);
    }
});

来源：https://stackoverflow.com/questions/57599945/how-to-detect-ios-13-on-javascript

标签

ios

iphone

safari

user-agent

ios13