javascript简易动画类(div渐变)

程序源码 代码如下: function Animate(el, prop, opts) { this.el = el; this.prop = prop; this.from = opts.from; this.to = opts.to; this.time = opts.time; this.callback = opts.callback; this.animDiff = this.to – this.from; } Animate.prototype._setStyle = function(val) { switch(this.prop) { case ‘opacity’: this