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/*js拖拽逻辑:第一：为什么要定位?因为往左往上left top要定位的哈第二：为什么点击down包括着移动move与抬起up.因为代表这三个是不独立的.第三：为什么down是div.move与up是document.因为鼠标移动是在document移动,点击是在div上点击.其实一句话,鼠标移动div跟着移动而已.*/核心代码：代表着鼠标到可视区-div到可视区===div到可视区.代表了***移动后的***的鼠标到可视区的----div到鼠标的距离.这里面可能有点难理解，我举
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