我有以下typescript代码:
private addBrowserNameAsCssClassToHtmlTag(): void {
var rootElement = angular.element(document.querySelector("html"));
if (this.isOpera()) {
rootElement.addClass("opera-browser");
} else if (this.isFirefox()) {
rootElement.addClass("firefox-browser");
} else if (this.isSafari()) {
rootElement.addClass("safari-browser");
} else if (this.isIE()) {
rootElement.addClass("ie-browser");
} else if (this.isChrome()) {
rootElement.addClass("chrome-browser");
}
}
private isOpera(): boolean {
return (!!(<any>window).opr && !!(<any>opr).addons) || !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;
}
private isFirefox(): boolean {
//noinspection TypeScriptUnresolvedVariable
return typeof InstallTrigger !== 'undefined';
}
private isSafari(): boolean {
return /constructor/i.test(window.HTMLElement) || ((p): boolean => {
return p.toString() === "[object SafariRemoteNotification]";
})(!window['safari'] || safari.pushNotification);
}
private isIE(): boolean {
return /*@cc_on!@*/false || !!window.document.documentMode;
}
private isChrome(): boolean {
return !!window.chrome && !!window.chrome.webstore;
}
代码可以正常运行,但问题在于它会生成编译时错误:
error TS2304: Cannot find name 'opr'.
error TS2339: Property 'opera' does not exist on type 'Window'.
error TS2304: Cannot find name 'InstallTrigger'.
error TS2339: Property 'HTMLElement' does not exist on type 'Window'.
error TS2304: Cannot find name 'safari'.
error TS2339: Property 'documentMode' does not exist on type 'Document'.
error TS2339: Property 'chrome' does not exist on type 'Window'.
error TS2339: Property 'chrome' does not exist on type 'Window'.
如果我使用普通的JavaScript编写代码,就不会遇到任何问题。如何消除编译器对这部分代码的警告?或者可能有更好的解决方案,我不知道吗?
Window
或Document
的定义并不是一个好主意。这些额外的成员在这里并没有被使用,它们只是被检查以确定浏览器的类型。在这里,使用方括号符号的技巧更加适用。 - Paleo