瀏覽器功能特性支持情況檢測JS庫：feature.js

jopen 8年前發布 | 16K 次閱讀 JavaScript開發 feature.js

Feature.js

Feature.js是一個快速，簡單和輕量級的瀏覽器功能特性檢測庫。只有1kb，沒有任何依賴。在頁面初始化的時候自動加載。

How to use

First, include the script somewhere on your page — usually either in the <head> or just before the </body> closing tag. No need to initialize or do anything else really, all the feature tests are now available for usage:

if (feature.webGL) {
  console.log("WebGL supported");
} else {
  console.log("WebGL not supported");
}

If you want to add a class to the <html> element like Modernizr does when something is supported, that’s simple:

if (feature.webGL) {
  document.documentElement.className += " webgl";
}

If you’re using jQuery, it’s even more simple:

if (feature.webGL) {
  $("html").addClass("webgl");
}

Combining multiple feature tests is possible too, you can just write an if statement like:

if (feature.canvas && feature.webGL) {
  console.log("Canvas and WebGL are supported")
}

When you want to target JavaScript only towards browsers that support the features you need, you can check inside a function if the tests return false and stop further execution:

(function() {
  if (!feature.webGL || !feature.svg) {
    console.log("Stopping… WebGL or SVG isn’t supported");
    return;
  }
  console.log("Browser supports both WebGL & SVG");
})();

Gotchas

There are few gotchas related to browser feature detection in general and these things are good to keep in mind when using the Feature.js library.

TOUCH: Feature.js tries to detect if touch events are supported, but this doesn’t necessarily reflect a touch screen device. Sometimes you might get a false positive on a device that doesn’t really have touchscreen since it’s virtually impossible nowadays to detect this accurately. For 95-98% of the time this test should be correct though, but you should always keep this in mind when using this detection.

CSS 3D TRANSFORMS: Current implementation might give false positive on some older Android stock WebKits in very rare cases. This issue is currently being tracked and will be addressed in the future releases if needed.

DEVICE MOTION & ORIENTATION: Keep in mind that many desktop browsers support these event listeners, and will hence give a positive result even though the device might not have the needed sensors.

PLACEHOLDERS: Feature.js gives false negative for iOS 3 Safari, but since this OS has basically no users, it’s not considered an issue at the moment.

API reference

Below you’ll find a list of all the available browser feature tests and how to call them.

feature.async
feature.addEventListener
feature.canvas
feature.classList
feature.cors
feature.contextMenu
feature.css3Dtransform
feature.cssTransform
feature.cssTransition
feature.defer
feature.deviceMotion
feature.deviceOrientation
feature.geolocation
feature.historyAPI
feature.placeholder
feature.localStorage
feature.matchMedia
feature.pictureElement
feature.querySelectorAll
feature.remUnit
feature.serviceWorker
feature.sizes
feature.srcset
feature.svg
feature.touch
feature.viewportUnit
feature.webGL

Live demo

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