[英]dart2js compiled code running in an unsupported browser
What happens if I try to run my generated javascript code in an unsupported browser? 如果我尝试在不受支持的浏览器中运行生成的javascript代码会发生什么? Like IE6? 喜欢IE6?
I don't want to end up in a situation that my users will see a partly working broken app. 我不希望最终我的用户会看到部分工作破坏的应用程序。 Is there a way how to ensure that the dart/javascript will run only if the browser is supported and have my app degrade gracefully to some html banner "use a newer browser please" if it is not? 有没有办法如何确保dart / javascript只有在支持浏览器并且我的应用程序优雅地降级到某些html横幅时才会运行“请使用更新的浏览器”如果不是?
您始终可以在纯JavaScript中检测浏览器,并且在确保浏览器有效之前不要运行dart程序。
You could use the browser detector script here: http://www.quirksmode.org/js/detect.html 您可以在此处使用浏览器检测器脚本: http : //www.quirksmode.org/js/detect.html
I wrote this code from the top of my head, I don't have a testing machine at my disposal right now: 我从头顶编写了这段代码,我现在没有可供使用的测试机:
var isNewFirefox = BrowserDetect.browser === 'Firefox' && BrowserDetect.version >= 7;
var isNewChrome = BrowserDetect.browser === 'Chrome';
var isNewIE = BrowserDetect.browser === 'Explorer' && BrowserDetect.version >= 9;
var isNewSafari = BrowserDetect.browser === 'Safari' && BrowserDetect.version >= 5.1;
var isNewOpera = BrowserDetect.browser === 'Opera' && BrowserDetect.version >= 12;
if (isNewFirefox || isNewChrome || isNewIE || isNewSafari || isNewOpera) {
var script = document.createElement('script');
if (navigator.webkitStartDart || navigator.startDart || navigator.mozStartDart || navigator.oStartDart || navigator.msStartDart) {
// Load Dart code!
script.setAttribute('type', 'application/dart');
script.setAttribute('src', 'http://.../foo.dart');
} else {
// Load dart2js code!
script.setAttribute('src', 'http://.../foo.js');
}
document.body.appendChild(script);
} else {
alert('Application wont work');
}
The version information can be found on: http://www.dartlang.org/support/faq.html#what-browsers-supported 版本信息可在以下网址找到: http : //www.dartlang.org/support/faq.html#what-browsers-supported
Dart VM detection: http://www.dartlang.org/dartium/#detect Dart VM检测: http : //www.dartlang.org/dartium/#detect
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