基于Javascr ipt的三个动画函数，透明度渐变、位置移动、尺寸变化，不喜欢臃肿的JS，所以自己写了这个，适用于做前端网页设计，只需要简单的动画效果但又不想引入整个动画类的情况下，可以使用本函数。 -The three animation functions based on Javascr ipt, transparency, gradient, location, movement, size changes, do not like bloated JS, so to write this, for to do front-end web design, just a simple animation but do not want to introduce the animation class cases, you can use this function.