bd028579
 易尊强
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declare const wx: {
getSystemInfoSync: Function
};
class Browser {
firefox = false
ie = false
edge = false
newEdge = false
weChat = false
version: string | number
}
class Env {
browser = new Browser()
node = false
wxa = false
worker = false
svgSupported = false
touchEventsSupported = false
pointerEventsSupported = false
domSupported = false
transformSupported = false
transform3dSupported = false
hasGlobalWindow = typeof window !== 'undefined'
}
const env = new Env();
if (typeof wx === 'object' && typeof wx.getSystemInfoSync === 'function') {
env.wxa = true;
env.touchEventsSupported = true;
}
else if (typeof document === 'undefined' && typeof self !== 'undefined') {
// In worker
env.worker = true;
}
else if (
typeof navigator === 'undefined'
|| navigator.userAgent.indexOf('Node.js') === 0
) {
// In node
env.node = true;
env.svgSupported = true;
}
else {
detect(navigator.userAgent, env);
}
// Zepto.js
// (c) 2010-2013 Thomas Fuchs
// Zepto.js may be freely distributed under the MIT license.
function detect(ua: string, env: Env) {
const browser = env.browser;
const firefox = ua.match(/Firefox\/([\d.]+)/);
const ie = ua.match(/MSIE\s([\d.]+)/)
// IE 11 Trident/7.0; rv:11.0
|| ua.match(/Trident\/.+?rv:(([\d.]+))/);
const edge = ua.match(/Edge?\/([\d.]+)/); // IE 12 and 12+
const weChat = (/micromessenger/i).test(ua);
if (firefox) {
browser.firefox = true;
browser.version = firefox[1];
}
if (ie) {
browser.ie = true;
browser.version = ie[1];
}
if (edge) {
browser.edge = true;
browser.version = edge[1];
browser.newEdge = +edge[1].split('.')[0] > 18;
}
// It is difficult to detect WeChat in Win Phone precisely, because ua can
// not be set on win phone. So we do not consider Win Phone.
if (weChat) {
browser.weChat = true;
}
env.svgSupported = typeof SVGRect !== 'undefined';
env.touchEventsSupported = 'ontouchstart' in window && !browser.ie && !browser.edge;
env.pointerEventsSupported = 'onpointerdown' in window
&& (browser.edge || (browser.ie && +browser.version >= 11));
env.domSupported = typeof document !== 'undefined';
const style = document.documentElement.style;
env.transform3dSupported = (
// IE9 only supports transform 2D
// transform 3D supported since IE10
// we detect it by whether 'transition' is in style
(browser.ie && 'transition' in style)
// edge
|| browser.edge
// webkit
|| (('WebKitCSSMatrix' in window) && ('m11' in new WebKitCSSMatrix()))
// gecko-based browsers
|| 'MozPerspective' in style
) // Opera supports CSS transforms after version 12
&& !('OTransition' in style);
// except IE 6-8 and very old firefox 2-3 & opera 10.1
// other browsers all support `transform`
env.transformSupported = env.transform3dSupported
// transform 2D is supported in IE9
|| (browser.ie && +browser.version >= 9);
}
export default env;
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