我目前不想尝试将此代码移植到TypeScript.
if (typeof window !== 'undefined') {
window.requestAnimFrame = (function(callback){
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function(callback){
window.setTimeout(callback, 1000 / 60, new Date().getTime());
};
})();
}
我得到的tsc错误是:
supplied parameters do not match any signature of call target
我已经尝试声明一个接口WindowEx扩展Window包含签名,然后转换为(< WindowEx>窗口).xxx,但我怀疑这是转换这个“典型”代码的正确方法.
尝试:
interface WindowEx extends Window {
requestAnimFrame(callback, target?):number;
webkitRequestAnimationFrame(callback, target?):number;
mozRequestAnimationFrame(callback, target?):number;
oRequestAnimationFrame(callback, target?):number;
// msRequestAnimationFrame already at WindowAnimationTiming interface
}
最佳答案 这是我为编译代码所做的工作.我刚刚将requestAnimFrame()定义为全局并键入它,以便TypeScript可以验证对它的调用.目前没有任何扩展内置类型(如窗口)的好方法,因此需要执行诸如(< any> window).webkitRequestAnimationFrame之类的操作.作为一般规则,如果编译器抱怨并且您知道它是有效的JavaScript,您始终可以转换为< any>使它工作.
var requestAnimFrame: (callback: () => void) => void = (function(){
return window.requestAnimationFrame ||
(<any>window).webkitRequestAnimationFrame ||
(<any>window).mozRequestAnimationFrame ||
(<any>window).oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function(callback){
window.setTimeout(callback, 1000 / 60, new Date().getTime());
};
})();