fix: catchEvent empty points, 不传入el，用catchEvent传入事件的方式，points无法初始化 #126
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不传入el，用catchEvent传入事件的方式，points无法初始化 ``` javascript const at = new AnyTouch(); at.catchEvent(touchevent); ``` 这种方式使用会报错，原因是createInput的过程中在判断 eventTarget 是否在根元素下时，由于未指定根元素，导致所有的touch点都被过滤了。于是后续处理过程中points全是空数组，导致报错。
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不传入el，用catchEvent传入事件的方式，points无法初始化
这种方式使用会报错，原因是createInput的过程中在判断 eventTarget 是否在根元素下时，由于未指定根元素，导致所有的touch点都被过滤了。于是后续处理过程中points全是空数组，导致报错。