svg 贝塞尔曲线画法
https://cubic-bezier.com/#.48,.46,.38,.8
<animate attributeName="x" dur="5s" values="0; 80; 160" keyTimes="0; .8; 1" calcMode="spline" keySplines=".5 0 .5 1; 0 0 1 1" />
标签：bezier,#.,画法,svg,曲线,贝塞尔 From： https://www.cnblogs.com/newmiracle/p/17027214.html