* 补间动画类 * 读取、计算、设置css属性值 * @param {DOM} elem [description] * @param {Object} options 经过speed修正后的对象，包括duration，easing.. * @param {String} prop css属性 * @param {Number} end css属性值 * @param {String} easing 动画算法swing...
( elem, options, prop, end, easing )
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