requestAnimationFrame

Posted 2020-09-13

requestAnimationFrame是实现如“最优帧速率”、“选择绘制下一帧的最佳时机”的功能，它的兼容性写法：

var rAF = window.requestAnimationFrame    ||
    window.webkitRequestAnimationFrame    ||
    window.mozRequestAnimationFrame        ||
    window.oRequestAnimationFrame        ||
    window.msRequestAnimationFrame        ||
    function (callback) { window.setTimeout(callback, 1000 / 60); };