enkows
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| getOffset = (event) -> | |
| target = event.target | |
| # 计算当前触发元素到文档的距离 | |
| pageCoord = | |
| X: 0 | |
| Y: 0 | |
| # 计算从当前触发元素到根节点为止， | |
| # 各级 offsetParent 元素的 offsetLeft 或 offsetTop 值之和 |