在类中使用requestAnimationFrame

Question

我在查找如何requestAnimationFrame在课堂上使用时遇到问题.

这段代码工作正常:

window.onload = function () {
    var width = 20;
    function animation() {
        width++;
        var element = document.getElementById("box");
        element.style.width = width + "px";
        requestAnimationFrame(animation);
    }
    requestAnimationFrame(animation);
};

但是当我尝试将它放入课堂时,我没有得到任何结果.

class Animation{
    width: number = 20;

    constructor() {
        requestAnimationFrame(this.loop);
    }
    loop() {
        this.width++;
        var element = document.getElementById("box");
        element.style.width = this.width + "px";
        requestAnimationFrame(this.loop);
    }
}
window.onload = function () {
    var animation = new Animation();
};

有人能告诉我这里有什么问题吗？

Answer 1

requestAnimationFrame(this.loop);如果你要传递给别人一个他们要打电话的功能,请使用箭头即requestAnimationFrame(()=>this.loop());或loop = () => {

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